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We have incurred&#13;approximately $274 million of cumulated net losses. As of June 30, 2018, we had approximately $26.3 million in cash, investment&#13;securities and interest receivable. We have substantial future capital requirements to continue our research and development activities&#13;and advance our product candidates through various development stages. The Company believes these expenditures are essential for&#13;the commercialization of its technologies.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;The Company expects its operating losses to&#13;continue for the foreseeable future as it continues its product development efforts, and when it undertakes marketing and sales&#13;activities. The Company&amp;#8217;s ability to achieve profitability is dependent upon its ability to obtain governmental approvals,&#13;produce, and market and sell its new product candidates. There can be no assurance that the Company will be able to commercialize&#13;its technology successfully or that profitability will ever be achieved. The operating results of the Company have fluctuated significantly&#13;in the past. We have substantial future capital requirements associated with our continued research and development activities&#13;and to advance our product candidates through various stages of development. The Company believes these expenditures are essential&#13;for the commercialization of its technologies.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;The actual amount of funds the Company will&#13;need to operate is subject to many factors, some of which are beyond the Company&amp;#8217;s control. These factors include the following:&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;table cellspacing="0" cellpadding="0" style="font: 12pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse"&gt;&#13;&lt;tr style="vertical-align: top"&gt;&#13;    &lt;td style="width: 24px"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 24px"&gt;&lt;font style="font-size: 10pt"&gt;&amp;#9679;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="text-align: justify"&gt;&lt;font style="font-size: 10pt"&gt;the progress of research activities;&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: top"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: justify"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: top"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font-size: 10pt"&gt;&amp;#9679;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="text-align: justify"&gt;&lt;font style="font-size: 10pt"&gt;the number and scope of research programs;&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: top"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: justify"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: top"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font-size: 10pt"&gt;&amp;#9679;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="text-align: justify"&gt;&lt;font style="font-size: 10pt"&gt;the progress of preclinical and clinical development activities;&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: top"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: justify"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: top"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font-size: 10pt"&gt;&amp;#9679;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="text-align: justify"&gt;&lt;font style="font-size: 10pt"&gt;the progress of the development efforts of parties with whom the Company has entered into research and development agreements;&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: top"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: justify"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: top"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font-size: 10pt"&gt;&amp;#9679;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="text-align: justify"&gt;&lt;font style="font-size: 10pt"&gt;the costs associated with additional clinical trials of product candidates;&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: top"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: justify"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: top"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font-size: 10pt"&gt;&amp;#9679;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="text-align: justify"&gt;&lt;font style="font-size: 10pt"&gt;the ability to maintain current research and development licensing arrangements and to establish new research and development and licensing arrangements;&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: top"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: justify"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: top"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font-size: 10pt"&gt;&amp;#9679;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="text-align: justify"&gt;&lt;font style="font-size: 10pt"&gt;the ability to achieve milestones under licensing arrangements;&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: top"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: justify"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: top"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font-size: 10pt"&gt;&amp;#9679;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="text-align: justify"&gt;&lt;font style="font-size: 10pt"&gt;the costs involved in prosecuting and enforcing patent claims and other intellectual property rights; and&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: top"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: justify"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: top"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font-size: 10pt"&gt;&amp;#9679;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="text-align: justify"&gt;&lt;font style="font-size: 10pt"&gt;the costs and timing of regulatory approvals.&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;/table&gt;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;The Company has based its estimate on assumptions&#13;that may prove to be wrong. The Company may need to obtain additional funds sooner or in greater amounts than it currently anticipates.&#13;Potential sources of financing include strategic relationships, public or private sales of the Company&amp;#8217;s shares or debt,&#13;the sale of its State of New Jersey net operating losses and other sources. If the Company raises funds by selling additional shares&#13;of common stock or other securities convertible into common stock, the ownership interest of existing stockholders may be diluted.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;With the $26.3 million in cash, investment&#13;securities and interest receivable at June 30, 2018, the Company believes it has sufficient capital resources to fund its operations&#13;into the first half of 2020. The Company will be required to obtain additional funding in order to continue the development of&#13;its current product candidates within the anticipated time periods, if at all, and to continue to fund operations. As more fully&#13;discussed in Note 11, the Company has $12.2 million available for future sale under a controlled equity offering facility it has&#13;with Cantor Fitzgerald &amp;#38; Co. as of June 30, 2018.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;Annually, the State of New Jersey enables&#13;approved technology and biotechnology businesses with New Jersey net operating tax losses the opportunity to sell these losses&#13;through the Technology Business Tax Certificate Program (NOL Program), thereby providing cash to companies to help fund their&#13;operations. The Company determined it met the eligibility requirements of the NOL Program for 2018 and successfully filed its&#13;application with the New Jersey Economic Development Authority in June 2018. In this application, the Company is requesting authorization&#13;of up to $12.5 million in cumulative New Jersey net operating losses to be eligible for sale; and would expect to net approximately&#13;90% of the authorized amount. The Company expects a decision on the NOL Program in the third quarter of 2018.&lt;/p&gt;</us-gaap:SubstantialDoubtAboutGoingConcernTextBlock>
    <us-gaap:DescriptionOfNewAccountingPronouncementsNotYetAdopted contextRef="From2018-01-01to2018-06-30">&lt;p style="margin: 0pt"&gt;&lt;/p&gt;&#13;&#13;&lt;table cellspacing="0" cellpadding="0" style="width: 100%; border-collapse: collapse"&gt;&#13;&lt;tr style="vertical-align: top"&gt;&#13;    &lt;td style="width: 48px; font: 12pt Times New Roman, Times, Serif"&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;Note 4.&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="font: 12pt Times New Roman, Times, Serif"&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;New Accounting Pronouncements&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;/table&gt;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;From time to time, new accounting pronouncements&#13;are issued by Financial Accounting Standards Board (FASB) and are adopted by us as of the specified effective date. Unless otherwise&#13;discussed, we believe that the impact of recently issued accounting pronouncements will not have a material impact on the Company&amp;#8217;s&#13;consolidated financial position, results of operations, and cash flows, or do not apply to our operations.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;In May 2014, the FASB issued Accounting Standards&#13;Update (ASU) No. 2014-09 &amp;#8220;Revenue from Contracts with Customers (Topic 606),&amp;#8221; which supersedes all existing revenue&#13;recognition requirements, including most industry-specific guidance. The new standard requires a company to recognize revenue when&#13;it transfers goods or services to customers in an amount that reflects the consideration that the company expects to receive for&#13;those goods or services. ASU 2014 - 09 was originally going to be effective on January 1, 2017; however, the FASB issued ASU 2015-14,&#13;&amp;#8220;Revenue from Contracts with Customers (Topic 606) - Deferral of the Effective Date,&amp;#8221; which deferred the effective&#13;date of ASU 2014-09 by one year to January 1, 2018. In March 2016, the FASB issued ASU No. 2016 - 8, &amp;#8220;Revenue from Contracts&#13;with Customers (Topic 606): Principal versus Agent Considerations. The amendments in this ASU do not change the core principle&#13;of ASU No. 2014 - 09 but the amendments clarify the implementation guidance on reporting revenue gross versus net. The effective&#13;date for the amendments in this ASU is the same as the effective date of ASU No. 2014-09. In April 2016, the FASB issued ASU No.&#13;2016-10, &amp;#8220;Revenue from Contracts with Customers (Identifying Performance Obligations and Licensing),&amp;#8221; to clarify the&#13;implementation guidance on identifying performance obligations and licensing (collectively &amp;#8220;the new revenue standards&amp;#8221;).&#13;The new revenue standards allow for either &amp;#8220;full retrospective&amp;#8221; adoption, meaning the standard is applied to all periods&#13;presented, or &amp;#8220;modified retrospective&amp;#8221; adoption, meaning the standard is applied only to the most current period presented&#13;in the financial statements. The new revenue standard became effective for us on January 1, 2018. Under the new revenue standards,&#13;we recognize revenue following a five-step model prescribed under ASU No. 2014-09;(i) identify contract(s) with a customer;(ii)&#13;identify the performance obligations in the contract;(iii) determine the transaction price;(iv) allocate the transaction price&#13;to the performance obligations in the contract; and (v) recognize revenues when (or as) we satisfy the performance obligation.&#13;As further described in Note 15, the Company currently has only one contract subject to the new revenue standards. After performance&#13;of the five-step model discussed above, the Company concluded the adoption of the new revenue standards as of January 1, 2018 did&#13;not change our revenue recognition policy nor does it have an effect on our financial statements using either the full retrospective&#13;or the modified retrospective adoption methods.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;In January 2016, the FASB issued Accounting&#13;Standards Update No. 2016-01, &amp;#8220;Recognition and Measurement of Financial Assets and Financial Liabilities,&amp;#8221; which requires&#13;that most equity investments be measured at fair value, with subsequent changes in fair value recognized in net income (other than&#13;those accounted for under the equity method of accounting). This guidance is effective for fiscal years, and interim periods within&#13;those years, beginning after December 15, 2017. Based on the Company&amp;#8217;s evaluation, the adoption of the ASU 2016-01 does not&#13;have a material impact on its consolidated financial statements or its disclosures.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;In February 2016, the FASB issued Accounting&#13;Standards Update No. 2016-02, &amp;#8220;Leases&amp;#8221; (Topic 842), which requires that lessees recognize assets and liabilities for&#13;leases with lease terms greater than twelve months in the statement of financial position. Leases will be classified as either&#13;finance or operating, with classification affecting the pattern of expense recognition in the income statement. This update also&#13;requires improved disclosures to help users of financial statements better understand the amount, timing and uncertainty of cash&#13;flows arising from leases. The update is effective for fiscal years beginning after December 15, 2018, including interim reporting&#13;periods within that reporting period. Early adoption is permitted. The Company is currently evaluating the impact the adoption&#13;of this guidance will have on its consolidated financial statements and disclosures.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;In August 2016, the FASB issued Accounting&#13;Standard Update No. 2016-15, &amp;#8220;Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments.&amp;#8221;&#13;This update clarifies how certain cash receipts and payments should be presented in the statement of cash flows and is effective&#13;for interim and annual reporting periods beginning after December 15, 2017, with early adoption permitted. Based on the Company&amp;#8217;s&#13;evaluation, the adoption of the ASU 2016-01 did not have a material impact on its consolidated financial statements or its disclosures.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;In November 2016, the FASB issued Accounting&#13;Standard Update No. 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash. This update amends the guidance in ASC 230,&#13;including providing additional guidance related to transfers between cash and restricted cash and how entities present, in their&#13;statement of cash flows, the cash receipts and cash payments that directly affect the restricted cash accounts. This guidance is&#13;effective for annual reporting periods beginning after December 15, 2017, and interim periods within those years, with early adoption&#13;permitted. Based on the Company&amp;#8217;s evaluation, the adoption of the ASU 2016 - 01 did not have a material impact on its consolidated&#13;financial statements or its disclosures.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;In January 2017, the FASB issued Accounting&#13;Standard Update No. 2017-01, &amp;#8220;Business Combinations (Topic 805): Clarifying the Definition of a Business,&amp;#8221; which clarifies&#13;the definition of a business with the objective of adding guidance to assist entities with evaluating whether transactions should&#13;be accounted for as acquisitions (or disposals) of assets or businesses. This guidance is effective for annual reporting periods&#13;beginning after December 15, 2018, and interim periods within those years, with early adoption permitted. The Company is currently&#13;evaluating the impact of adoption on its consolidated financial statements.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;In January 2017, the FASB issued Accounting&#13;Standard Update &lt;i&gt;No. 2017&lt;/i&gt;-&lt;i&gt;04,&lt;/i&gt; &amp;#8220;Intangibles-Goodwill and Other, Simplifying the Test for Goodwill Impairment,&amp;#8221;&#13;which eliminates Step &lt;i&gt;2&lt;/i&gt; from the goodwill impairment test. Under the revised test, an entity should perform its annual,&#13;or interim, goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount. An entity should&#13;recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit&amp;#8217;s fair value; however,&#13;the loss recognized should &lt;i&gt;not&lt;/i&gt; exceed the total amount of goodwill allocated to that reporting unit. This ASU is effective&#13;for any interim or annual impairment tests for fiscal years beginning after December 15, 2019, with early adoption permitted.&#13;The Company adopted this method for its impairment test of goodwill during 2017.&lt;/p&gt;</us-gaap:DescriptionOfNewAccountingPronouncementsNotYetAdopted>
    <us-gaap:EarningsPerShareTextBlock contextRef="From2018-01-01to2018-06-30">&lt;p style="margin: 0pt"&gt;&lt;/p&gt;&#13;&#13;&lt;table cellspacing="0" cellpadding="0" style="width: 100%; border-collapse: collapse"&gt;&#13;&lt;tr style="vertical-align: top"&gt;&#13;    &lt;td style="width: 48px; font: 12pt Times New Roman, Times, Serif"&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;Note 5&lt;i&gt;.&lt;/i&gt;&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="font: 12pt Times New Roman, Times, Serif"&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;Net Loss per Common Share&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;/table&gt;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;Basic loss per share is calculated based upon&#13;the net loss available to common shareholders divided by the weighted average number of common shares outstanding during the period.&#13;Diluted loss per share is calculated after adjusting the denominator of the basic earnings per share computation for the effects&#13;of all dilutive potential common shares outstanding during the period. The dilutive effects of preferred stock, options and warrants&#13;and their equivalents are computed using the treasury stock method.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;The total number of shares of common stock&#13;issuable upon exercise of warrants, stock option grants and equity awards were 6,255,757 and 1,284,154 shares for the three and&#13;six-month periods ended June 30, 2018 and 2017, respectively. For the three and six month periods ended June 30, 2018 and 2017,&#13;diluted loss per common share was the same as basic loss per common share as all options and all warrants that were exercisable&#13;into shares of the Company&amp;#8217;s common stock were excluded from the calculation of diluted earnings attributable to common&#13;shareholders per common share as their effect would have been anti-dilutive.&lt;/p&gt;</us-gaap:EarningsPerShareTextBlock>
    <us-gaap:DerivativesAndFairValueTextBlock contextRef="From2018-01-01to2018-06-30">&lt;p style="margin: 0pt"&gt;&lt;/p&gt;&#13;&#13;&lt;table cellspacing="0" cellpadding="0" style="width: 100%; border-collapse: collapse"&gt;&#13;&lt;tr style="vertical-align: top"&gt;&#13;    &lt;td style="width: 48px; font: 12pt Times New Roman, Times, Serif"&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;Note 6.&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="font: 12pt Times New Roman, Times, Serif"&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;Fair Value of Financial Instruments&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;/table&gt;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;Short-term investments available for sale of&#13;$13,442,107 and $12,724,020 as of June 30, 2018 and December 31, 2017, respectively, consist of money market funds, commercial&#13;paper, corporate debt securities, and government agency debt securities. They are valued at estimated fair value, with unrealized&#13;gains and losses reported as a separate component of stockholders&amp;#8217; equity in accumulated other comprehensive loss.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;Securities available for sale are evaluated&#13;periodically to determine whether a decline in their value is other than temporary. The term &amp;#8220;other than temporary&amp;#8221;&#13;is not intended to indicate a permanent decline in value. Rather, it means that the prospects for near term recovery of value are&#13;not necessarily favorable, or that there is a lack of evidence to support fair values equal to, or greater than, the carrying value&#13;of the security. Management reviews criteria such as the magnitude and duration of the decline, as well as the reasons for the&#13;decline, to predict whether the loss in value is other than temporary. Once a decline in value is determined to be other than temporary,&#13;the value of the security is reduced and a corresponding charge to earnings is recognized.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;A summary of the cost, fair value and maturities&#13;of the Company&amp;#8217;s short-term investments is as follows:&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;table cellspacing="0" cellpadding="0" style="font: 12pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse"&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="6" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;June 30, 2018&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="6" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;December 31, 2017&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;Cost&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;Fair Value&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;Cost&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;Fair Value&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;Short-term investments&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td style="width: 48%"&gt;&lt;font style="font-size: 10pt"&gt;Certificate of deposit&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 10%; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;1,714,375&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 10%; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;1,721,698&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 10%; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;-&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 10%; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;-&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&lt;font style="font-size: 10pt"&gt;Corporate debt securities&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;11,731,979&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;11,720,409&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;12,734,184&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;12,724,020&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;Total&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;13,446,354&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;13,442,107&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;12,734,184&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;12,724,020&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;/table&gt;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;table cellspacing="0" cellpadding="0" style="font: 12pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse"&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="6" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;June 30, 2018&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="6" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;December 31, 2017&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;Cost&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;Fair Value&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;Cost&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;Fair Value&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;Short-term investment maturities&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td style="width: 48%"&gt;&lt;font style="font-size: 10pt"&gt;Within 3 months&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 10%; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;4,241,961&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 10%; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;4,244,210&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 10%; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;-&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 10%; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;-&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&lt;font style="font-size: 10pt"&gt;Between 3-12 months&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;9,204,393&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;9,197,897&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;12,734,184&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;12,724,020&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;Total&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;13,446,354&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;13,442,107&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;12,734,184&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;12,724,020&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;/table&gt;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;The following table shows the Company&amp;#8217;s&#13;investment securities gross unrealized losses and fair value by investment category and length of time that individual securities&#13;have been in a continuous unrealized loss position at June 30, 2018 and December 31, 2017. The Company has reviewed individual&#13;securities to determine whether a decline in fair value below the amortizable cost basis is other than temporary.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;table cellspacing="0" cellpadding="0" style="font: 12pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse"&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="6" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;June 30, 2018&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="6" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;December 31, 2017&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;Available for sale securities&lt;/b&gt; (all unrealized holding gains and losses are less than 12 months at date of measurement)&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;Fair Value&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt; text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid"&gt;&#13;        &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;Unrealized&lt;/b&gt;&lt;/p&gt;&#13;        &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;Holding&lt;/b&gt;&lt;/p&gt;&#13;        &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;Gains&lt;/b&gt;&lt;/p&gt;&#13;        &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;(Losses)&lt;/b&gt;&lt;/p&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt; text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;Fair Value&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid"&gt;&#13;        &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;Unrealized&lt;/b&gt;&lt;/p&gt;&#13;        &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;Holding&lt;/b&gt;&lt;/p&gt;&#13;        &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;Gains&lt;/b&gt;&lt;/p&gt;&#13;        &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;(Losses)&lt;/b&gt;&lt;/p&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td style="width: 48%"&gt;&lt;font style="font-size: 10pt"&gt;Investments with unrealized gains&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 10%; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;4,986,645&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 10%; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;10,663&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 10%; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;748,148&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 10%; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;570&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&lt;font style="font-size: 10pt"&gt;Investments with unrealized losses&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;8,455,462&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;(14,910&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&lt;font style="font-size: 10pt"&gt;)&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;11,975,872&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;(10,734&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&lt;font style="font-size: 10pt"&gt;)&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td style="padding-bottom: 2.5pt; padding-left: 10pt"&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;Total&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;13,442,107&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;(4,247&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&lt;font style="font-size: 10pt"&gt;)&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;12,724,020&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;(10,164&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&lt;font style="font-size: 10pt"&gt;)&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;/table&gt;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;Investment income, which includes net realized&#13;losses on sales of available for sale securities and investment income interest and dividends, is summarized as follows:&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;table cellspacing="0" cellpadding="0" style="font: 12pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse"&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="6" style="border-bottom: black 1.5pt solid"&gt;&#13;        &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;Three Months Ended&lt;/b&gt;&lt;/p&gt;&#13;        &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;June 30,&lt;/b&gt;&lt;/p&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;2018&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;2017&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td style="width: 72%"&gt;&lt;font style="font-size: 10pt"&gt;Interest and dividends accrued and paid&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 11%; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;69,559&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 11%; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;1,426&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&lt;font style="font-size: 10pt"&gt;Realized gains&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;3,902&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;-&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&lt;font style="font-size: 10pt"&gt;Investment income, net&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;73,461&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;1,426&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;/table&gt;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;table cellspacing="0" cellpadding="0" style="font: 12pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse"&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="6" style="border-bottom: black 1.5pt solid"&gt;&#13;        &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;Six Months Ended&lt;/b&gt;&lt;/p&gt;&#13;        &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;June 30,&lt;/b&gt;&lt;/p&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;2018&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;2017&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td style="width: 72%"&gt;&lt;font style="font-size: 10pt"&gt;Interest and dividends accrued and paid&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 11%; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;138,848&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 11%; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;3,417&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&lt;font style="font-size: 10pt"&gt;Realized gains&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;8,337&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;-&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&lt;font style="font-size: 10pt"&gt;Investment income, net&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;147,185&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;3,417&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;/table&gt;&#13;&#13;&#13;&lt;p style="margin: 0pt"&gt;&lt;/p&gt;</us-gaap:DerivativesAndFairValueTextBlock>
    <us-gaap:FairValueDisclosuresTextBlock contextRef="From2018-01-01to2018-06-30">&lt;p style="margin: 0pt"&gt;&lt;/p&gt;&#13;&#13;&lt;table cellspacing="0" cellpadding="0" style="width: 100%; border-collapse: collapse"&gt;&#13;&lt;tr style="vertical-align: top"&gt;&#13;    &lt;td style="width: 48px; font: 12pt Times New Roman, Times, Serif"&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;Note 7.&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="font: 12pt Times New Roman, Times, Serif"&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;Fair Value Measurements&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;/table&gt;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;FASB Accounting Standards Codification (ASC)&#13;Section 820 &amp;#8220;Fair Value Measurements and Disclosures,&amp;#8221; establishes a three-level hierarchy for fair value measurements&#13;which requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair&#13;value. The three levels of inputs that may be used to measure fair value are as follows:&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 0.5in; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 0.5in; text-align: justify"&gt;Level 1: Quoted prices (unadjusted)&#13;or identical assets or liabilities in active markets that the entity has the ability to access as of the measurement date;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 0.5in; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 0.5in; text-align: justify"&gt;Level 2: Significant other observable&#13;inputs other than Level 1 prices such as quoted prices for similar assets or liabilities; quoted prices in markets that are not&#13;active; or other inputs that are observable or can be corroborated by observable market data; and&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 0.5in; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 0.5in; text-align: justify"&gt;Level 3: Significant unobservable&#13;inputs that reflect a reporting entity&amp;#8217;s own assumptions that market participants would use in pricing an asset or liability.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;The fair values of securities available for&#13;sale are determined by obtaining quoted prices on nationally recognized exchanges (Level 1 inputs) or matrix pricing, which is&#13;a mathematical technique widely used in the industry to value debt securities without relying exclusively on quoted prices for&#13;the specific securities but rather by relying on the securities&amp;#8217; relationship to other benchmark quoted securities (Level&#13;2 inputs).&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;Cash and cash equivalents, other current assets,&#13;accounts payable and other accrued liabilities are reflected in the condensed consolidated balance sheet at their estimated fair&#13;values primarily due to their short-term nature. There were no transfers of assets or liabilities between Level 1 and Level 2 and&#13;no transfers in or out of Level 3 during the six months ended June 30, 2018 or 2017. All changes in Level 3 liabilities were the&#13;result of changes in the fair value of the earn-out milestone liability included in earnings (see Note 13).&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;Assets and liabilities measured at fair value&#13;are summarized below:&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;table cellspacing="0" cellpadding="0" style="font: 12pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse"&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td style="text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt; text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;Total Fair Value&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt; text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt; text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid"&gt;&#13;        &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;Quoted Prices&lt;/b&gt;&lt;/p&gt;&#13;        &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;In Active Markets&lt;/b&gt;&lt;/p&gt;&#13;        &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;For Identical Assets/Liabilities (Level 1)&lt;/b&gt;&lt;/p&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt; text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt; text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid"&gt;&#13;        &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;Significant Other Observable Inputs&lt;/b&gt;&lt;/p&gt;&#13;        &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;(Level 2)&lt;/b&gt;&lt;/p&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt; text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt; text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid"&gt;&#13;        &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;Significant Unobservable Inputs&lt;/b&gt;&lt;/p&gt;&#13;        &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;(Level 3)&lt;/b&gt;&lt;/p&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt; text-align: center"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td style="width: 40%"&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;Assets:&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 11%; text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 15%; text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 11%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 11%; text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td&gt;&lt;font style="font-size: 10pt"&gt;Recurring items as of June 30, 2018&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td style="padding-bottom: 2.5pt; padding-left: 10pt"&gt;&lt;font style="font-size: 10pt"&gt;Investment securities, available for sale&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;13,442,107&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;13,442,107&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;&amp;#9472;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;&amp;#9472;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&lt;font style="font-size: 10pt"&gt;Recurring items as of December 31, 2017&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td style="padding-bottom: 2.5pt; padding-left: 10pt"&gt;&lt;font style="font-size: 10pt"&gt;Investment securities, available for sale&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;12,724,020&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;12,724,020&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;&amp;#9472;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;&amp;#9472;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;Liabilities:&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td&gt;&lt;font style="font-size: 10pt"&gt;Recurring items as of June 30, 2018&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td style="padding-bottom: 2.5pt; padding-left: 10pt"&gt;&lt;font style="font-size: 10pt"&gt;Earn-out milestone liability (Note 13)&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;13,085,849&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;&amp;#9472;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;&amp;#9472;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;13,085,849&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&lt;font style="font-size: 10pt"&gt;Recurring items as of December 31, 2017&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td style="padding-bottom: 2.5pt; padding-left: 10pt"&gt;&lt;font style="font-size: 10pt"&gt;Earn-out milestone liability (Note 13)&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;12,538,525&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;&amp;#9472;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;&amp;#9472;&amp;#160;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;12,538,525&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;/table&gt;&#13;&#13;&#13;&lt;p style="margin: 0pt"&gt;&lt;/p&gt;</us-gaap:FairValueDisclosuresTextBlock>
    <us-gaap:BusinessCombinationDisclosureTextBlock contextRef="From2018-01-01to2018-06-30">&lt;p style="margin: 0pt"&gt;&lt;/p&gt;&#13;&#13;&lt;table cellspacing="0" cellpadding="0" style="width: 100%; border-collapse: collapse"&gt;&#13;&lt;tr style="vertical-align: top"&gt;&#13;    &lt;td style="width: 48px; font: 12pt Times New Roman, Times, Serif"&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;Note 8.&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="font: 12pt Times New Roman, Times, Serif"&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;Acquisition of EGEN Assets&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;/table&gt;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;On June 20, 2014, we completed the acquisition&#13;of substantially all of the assets of EGEN, Inc., an Alabama corporation, which has changed its company name to EGWU, Inc. after&#13;the closing of the acquisition (&amp;#8220;EGEN&amp;#8221;), pursuant to an Asset Purchase Agreement dated as of June 6, 2014, by and between&#13;EGEN and Celsion (the &amp;#8220;Asset Purchase Agreement&amp;#8221;). We acquired all of EGEN&amp;#8217;s right, title and interest in and&#13;to substantially all of the assets of EGEN, including cash and cash equivalents, patents, trademarks and other intellectual property&#13;rights, clinical data, certain contracts, licenses and permits, equipment, furniture, office equipment, furnishings, supplies and&#13;other tangible personal property. In addition, CLSN Laboratories assumed certain specified liabilities of EGEN, including the liabilities&#13;arising out of the acquired contracts and other assets relating to periods after the closing date.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;The total purchase price for the asset acquisition&#13;is up to $44.4 million, including potential future earnout payments of up to $30.4 million contingent upon achievement of certain&#13;earnout milestones set forth in the Asset Purchase Agreement. At the closing, we paid approximately $3.0 million in cash after&#13;the expense adjustment and issued 193,728 shares of our common stock to EGEN. The shares of common stock were issued in a private&#13;transaction exempt from registration under the Securities Act, pursuant to Section 4 (2) thereof. In addition, 47,862 shares of&#13;common stock were held back by us at the closing and are issuable to EGEN pending satisfactory resolution of any post-closing adjustments&#13;for expenses or in relation to EGEN&amp;#8217;s indemnification obligations under the Asset Purchase Agreement. These shares were issued&#13;to EGEN on June 16, 2017.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;After its review in 2016, management concluded&#13;that there was no immediate opportunity to out-license TheraSilence. As a result of this analysis, the earnout payments were adjusted&#13;prior to 2017 and are now up to $24.4 million that may become payable, in cash, shares of our common stock or a combination thereof,&#13;at our option, upon achievement of the remaining two major milestone events as follows:&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 9.9pt; text-align: justify; text-indent: 29.7pt"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;table cellspacing="0" cellpadding="0" style="font: 12pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse"&gt;&#13;&lt;tr style="vertical-align: top"&gt;&#13;    &lt;td style="width: 14px; text-align: justify"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 48px; text-align: justify"&gt;&lt;font style="font-size: 10pt"&gt;&amp;#9679;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="text-align: justify"&gt;&lt;font style="font-size: 10pt"&gt;$12.4 million will become payable upon achieving certain specified development milestones relating to an ovarian cancer study of GEN-1 (formerly known as EGEN-001) to be conducted by us or our subsidiary; and&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: top"&gt;&#13;    &lt;td style="text-align: justify"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: justify"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: justify"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: top"&gt;&#13;    &lt;td style="text-align: justify"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: justify"&gt;&lt;font style="font-size: 10pt"&gt;&amp;#9679;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="text-align: justify"&gt;&lt;font style="font-size: 10pt"&gt;$12.0 million will become payable upon achieving certain specified development milestones relating to a GEN-1 glioblastoma multiforme brain cancer study to be conducted by us or our subsidiary.&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;/table&gt;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 7.7pt; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;The following table summarizes the fair values&#13;of these assets acquired and liabilities assumed related to the acquisition.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;table cellspacing="0" cellpadding="0" style="font: 12pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse"&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td style="width: 82%"&gt;&lt;font style="font-size: 10pt"&gt;Property and equipment, net&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 15%; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;35,000&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&lt;font style="font-size: 10pt"&gt;In-process research and development&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;24,211,000&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td&gt;&lt;font style="font-size: 10pt"&gt;Other Intangible assets (Covenant not to compete)&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;1,591,000&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&lt;font style="font-size: 10pt"&gt;Goodwill&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;1,976,000&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td&gt;&lt;font style="font-size: 10pt"&gt;Total assets:&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;27,813,000&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&lt;font style="font-size: 10pt"&gt;Accounts payable and accrued liabilities&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;(235,000&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&lt;font style="font-size: 10pt"&gt;)&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&lt;font style="font-size: 10pt"&gt;Net assets acquired&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;27,578,000&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;/table&gt;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;Acquired in-process research and development&#13;(IPR&amp;#38;D) consists of EGEN&amp;#8217;s drug technology platforms: TheraPlas and TheraSilence. The fair value of the IPR&amp;#38;D drug&#13;technology platforms was estimated to be $24.2 million as of the acquisition date. As of the closing of the acquisition, the IPR&amp;#38;D&#13;was considered indefinite lived intangible assets and will not be amortized. IPR&amp;#38;D is reviewed for impairment at least annually&#13;as of our third quarter ended September 30, and whenever events or changes in circumstances indicate that the carrying value of&#13;the assets might not be recoverable.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;At September 30, 2017, after the Company&amp;#8217;s&#13;annual assessment of the totality of the events that could impair IPR&amp;#38;D, the Company determined certain IPR&amp;#38;D assets related&#13;to the development of its glioblastoma multiforme cancer (GBM) product candidate may be impaired. To arrive at this determination,&#13;the Company assessed the status of studies in GBM conducted by its competitors and the Company&amp;#8217;s strategic commitment of&#13;resources to its studies in primary liver cancer and ovarian cancer. The Company estimated the fair value of the IPR&amp;#38;D related&#13;to GBM at September 30, 2017 using the multi-period excess earnings method (MPEEM). The Company concluded that the GBM asset, valued&#13;at $9.4 million, was partially impaired and wrote down the GBM asset to $6.9 million, incurring a non-cash charge of $2.5 million&#13;in the third quarter of 2017.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;At December 31, 2016, the Company determined&#13;one of the IPR&amp;#38;D assets related to the development of its RNA delivery system being developed with collaborators using their&#13;RNA product candidates may be impaired and after an assessment, the Company concluded that this asset, valued at $1.4 million,&#13;was impaired. Therefore, the Company wrote off the value of this IPR&amp;#38;D asset, incurring a non-cash charge of $1.4 million in&#13;the fourth quarter of 2016.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;As no indicators of impairment existed during&#13;the first half of 2018, the Company concluded none of the other IPR&amp;#38;D assets were impaired at June 30, 2018.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;Pursuant to the EGEN Purchase Agreement, EGEN&#13;provided certain covenants (&amp;#8220;Covenant Not To Compete&amp;#8221;) to the Company whereby EGEN agreed, during the period ending&#13;on the seventh anniversary of the closing date of the acquisition on June 20, 2014, not to enter into any business, directly or&#13;indirectly, which competes with the business of the Company nor will it contact, solicit or approach any of the employees of the&#13;Company for purposes of offering employment. The Covenant Not To Compete which was valued at approximately $1.6 million at the&#13;date of the EGEN acquisition has a definitive life and is amortized on a straight-line basis over its life of 7 years. The Company&#13;recognized amortization expense of $56,829 and 113,658 in each of the three and six-month periods ended June 30, 2018 and 2017,&#13;respectively. The fair value of the Covenant Not to Compete was $681,950, net of $909,264 accumulated amortization, as of June&#13;30, 2018 and $795,608, net of $795,606 accumulated amortization, as of December 31, 2017&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;The purchase price exceeded the estimated&#13;fair value of the net assets acquired by approximately $2.0 million which was recorded as Goodwill. Goodwill represents the difference&#13;between the total purchase price for the net assets purchased from EGEN and the aggregate fair values of tangible and intangible&#13;assets acquired, less liabilities assumed. Goodwill is reviewed for impairment at least annually as of our third quarter ended&#13;September 30 or sooner if we believe indicators of impairment exist. As of September 30, 2017, we concluded that the Company&amp;#8217;s&#13;fair value exceeded its carrying value therefore &amp;#8220;it is not more likely than not&amp;#8221; that the Goodwill was impaired.&lt;/p&gt;</us-gaap:BusinessCombinationDisclosureTextBlock>
    <us-gaap:AccountsPayableAndAccruedLiabilitiesDisclosureTextBlock contextRef="From2018-01-01to2018-06-30">&lt;p style="margin: 0pt"&gt;&lt;/p&gt;&#13;&#13;&lt;table cellspacing="0" cellpadding="0" style="width: 100%; border-collapse: collapse"&gt;&#13;&lt;tr style="vertical-align: top"&gt;&#13;    &lt;td style="width: 48px; font: 12pt Times New Roman, Times, Serif"&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;Note 9.&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="font: 12pt Times New Roman, Times, Serif"&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;Accrued Liabilities&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;/table&gt;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;Other accrued liabilities as of June 30, 2018&#13;and December 31, 2017 include the following:&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;table cellspacing="0" cellpadding="0" style="font: 12pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse"&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;June 30, 2018&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;December 31, 2017&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td style="width: 62%; text-align: justify"&gt;&lt;font style="font-size: 10pt"&gt;Amounts due to contract research organizations and &lt;/font&gt;&lt;br /&gt;&#13;&lt;font style="font-size: 10pt"&gt;other contractual agreements&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 16%; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;908,556&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 16%; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;665,373&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&lt;font style="font-size: 10pt"&gt;Accrued payroll and related benefits&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;733,539&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;1,258,265&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td&gt;&lt;font style="font-size: 10pt"&gt;Accrued professional fees&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;370,298&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;264,668&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&lt;font style="font-size: 10pt"&gt;Other&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;20,000&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;94,521&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;Total&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;2,032,393&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;2,282,827&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;/table&gt;&#13;&#13;&#13;&lt;p style="margin: 0pt"&gt;&lt;/p&gt;</us-gaap:AccountsPayableAndAccruedLiabilitiesDisclosureTextBlock>
    <us-gaap:DebtDisclosureTextBlock contextRef="From2018-01-01to2018-06-30">&lt;p style="margin: 0pt"&gt;&lt;/p&gt;&#13;&#13;&lt;table cellspacing="0" cellpadding="0" style="width: 100%; border-collapse: collapse"&gt;&#13;&lt;tr style="vertical-align: top"&gt;&#13;    &lt;td style="width: 48px; font: 12pt Times New Roman, Times, Serif"&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;Note 10.&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="font: 12pt Times New Roman, Times, Serif"&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;Note Payable&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;/table&gt;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;i&gt;Horizon Credit Agreement&lt;/i&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;On June 27, 2018, the Company entered into&#13;a loan agreement with Horizon Technology Finance Corporation (&amp;#8220;Horizon&amp;#8221;) that provided $10 million in new capital (the&#13;&amp;#8220;Horizon Credit Agreement&amp;#8221;). The Company drew down $10 million upon closing of the Horizon Credit Agreement on June&#13;27, 2018. The Company anticipates that it will use the funding provided under the Horizon Credit Agreement for working capital&#13;and advancement of its product pipeline.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;The obligations under the Horizon Credit Agreement&#13;are secured by a first-priority security interest in substantially all assets of Celsion other than intellectual property assets.&#13;The obligations will bear interest at a rate calculated based on one-month LIBOR plus 7.625%. Payments under the loan agreement&#13;are interest only for the first twenty-four (24) months after loan closing, followed by a 24-month amortization period of principal&#13;and interest through the scheduled maturity date. At its option, the Company can prepay all of the outstanding principal balance&#13;by prepaying the outstanding principal balance and an amount equal to 1-3% of the outstanding principal balance at that time, based&#13;on the amount of time prior to the maturity date of the notes.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;As a fee in connection with the Horizon Credit&#13;Agreement, Celsion issued Horizon warrants exercisable for a total of 190,114 shares of Celsion&amp;#8217;s common stock (the &amp;#8220;Horizon&#13;Warrants&amp;#8221;) at a per share exercise price of $2.63. The Horizon Warrants are immediately exercisable for cash or by net exercise&#13;from the date of grant and will expire after ten years from the date of grant. Celsion is required to register the common stock&#13;underlying the Horizon Warrants within 90 days from the date of grant and use its best efforts to keep it effective.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;The Horizon Credit Agreement contains customary&#13;representations, warranties and affirmative and negative covenants including, among other things, covenants that limit or restrict&#13;Celsion&amp;#8217;s ability to grant liens, incur indebtedness, make certain restricted payments, merge or consolidate and make dispositions&#13;of assets. Upon the occurrence of an event of default under the Horizon Credit Agreement, the lenders may cease making loans, terminate&#13;the Horizon Credit Agreement, declare all amounts outstanding to be immediately due and payable and foreclose on or liquidate Celsion&amp;#8217;s&#13;assets that comprise the lenders&amp;#8217; collateral. The Horizon Credit Agreement specifies a number of events of default (some&#13;of which are subject to applicable grace or cure periods), including, among other things, non-payment defaults, covenant defaults,&#13;a material adverse effect on Celsion or its assets, cross-defaults to other material indebtedness, bankruptcy and insolvency defaults&#13;and material judgment defaults.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;The Company valued the Horizon Warrants issued&#13;using the Black-Scholes option pricing model and recorded a total of $507,116 as a direct deduction from the debt liability consistent&#13;with the presentation of a debt discount and are being amortized as interest expense using the effective interest method over the&#13;life of the loan. Also, in connection with each of the Horizon Credit Agreement, the Company is required to pay an end of term&#13;charge equal to 4.0% of the original loan amount at time of maturity. Therefore, these amounts totaling $400,000 are being amortized&#13;as interest expense using the effective interest method over the life of the loan.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;In connection with the Horizon Credit Agreement,&#13;the Company incurred financing fees and expenses totaling $175,000 which are recorded and classified as debt discount. In addition,&#13;the Company paid loan origination fees of $100,000 which has been recorded and classified as debt discount. These debt discount&#13;amounts totaling $782,116 are being amortized as interest expense using the effective interest method over the life of the loan.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;For the three and six-month periods ended June&#13;30, 2018 the Company incurred $10,794 in interest expense and amortized $4,237 as interest expense for debt discounts and end of&#13;term charges in connection with the Horizon Credit Agreement.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;Following is a schedule of future principle&#13;payments, net of unamortized debt discounts and amortized end of term charges, due on the Horizon Credit Agreement:&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;table cellspacing="0" cellpadding="0" style="font: 12pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse"&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid"&gt;&#13;        &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;For the year&lt;/b&gt;&lt;/p&gt;&#13;        &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;ending&lt;/b&gt;&lt;/p&gt;&#13;        &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;June 30&lt;/b&gt;&lt;/p&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td&gt;&lt;font style="font-size: 10pt"&gt;2019&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;&amp;#8211;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&lt;font style="font-size: 10pt"&gt;2020&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;&amp;#8211;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td style="width: 79%"&gt;&lt;font style="font-size: 10pt"&gt;2021&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 18%; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;4,583,333&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&lt;font style="font-size: 10pt"&gt;2022&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;5,000,000&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&lt;font style="font-size: 10pt"&gt;2023 and thereafter&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;416,667&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&lt;font style="font-size: 10pt"&gt;Subtotal of future principle payments&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;10,000,000&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&lt;font style="font-size: 10pt"&gt;Net of unamortized debt issuance costs&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;(777,879&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&lt;font style="font-size: 10pt"&gt;)&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td style="padding-bottom: 2.5pt; padding-left: 10pt"&gt;&lt;font style="font-size: 10pt"&gt;Total&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;9,222,121&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;/table&gt;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;i&gt;Hercules Credit Agreement&lt;/i&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;In November 2013, the Company entered into&#13;a loan agreement with Hercules Technology Growth Capital, Inc. (Hercules) which permits up to $20 million in capital to be distributed&#13;in multiple tranches (the Hercules Credit Agreement). The Company drew the first tranche of $5 million upon closing of the Hercules&#13;Credit Agreement in November 2013 and used approximately $4 million of the proceeds to repay the outstanding obligations under&#13;its loan agreement with Oxford Finance LLC and Horizon Technology Finance Corporation as discussed further below. On June 10, 2014,&#13;the Company closed the second $5 million tranche under the Hercules Credit Agreement. The proceeds were used to fund the $3.0 million&#13;upfront cash payment associated with Celsion&amp;#8217;s acquisition of EGEN, as well as the Company&amp;#8217;s transaction costs associated&#13;with the EGEN acquisition. Upon the closing of the second tranche, the Company had drawn down a total of $10 million under the&#13;Hercules Credit Agreement.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;The obligations under the Hercules Credit Agreement&#13;are in the form of secured indebtedness bearing interest at a calculated prime-based variable rate (11.25% per annum since inception&#13;through December 17, 2015, 11.50% from December 18, 2015 through December 15, 2016 and 11.75% since). Payments under the loan agreement&#13;were interest only for the first twelve months after loan closing, followed by a 30 -month amortization period of principal and&#13;interest through the scheduled maturity date of June 1, 2017. In connection with the Hercules Credit Agreement, the Company incurred&#13;cash expenses of $122,378 which were recorded as deferred financing fees. These deferred financing fees were amortized as interest&#13;expense using the effective interest method over the life of the loan. In addition, the Company paid loan origination fees of $230,000&#13;which has been classified as debt discount. This amount is being amortized as interest expense using the effective interest method&#13;over the life of the loan.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;As a fee associated with the Hercules Credit&#13;Agreement, the Company issued Hercules a warrant for a total of 6,963 shares of the Company&amp;#8217;s common stock (the Hercules&#13;Warrant) at a per share exercise price of $50.26, exercisable for cash or by net exercise from November 25, 2013. Upon the closing&#13;of the second tranche on June 10, 2014, this warrant became exercisable for an additional 6,963 shares of the Company&amp;#8217;s common&#13;stock. The Hercules Warrant will expire November 25, 2018. Hercules has certain rights to register the common stock underlying&#13;the Hercules Warrant pursuant to a Registration Rights Agreement with the Company dated November 25, 2013. The registration rights&#13;expire on the date when such stock may be sold under Rule 144 without restriction or upon the first-year anniversary of the registration&#13;statement for such stock, whichever is earlier. The common stock issuable pursuant to the Hercules Warrant was filed pursuant to&#13;Rule 415 under the Securities Act of 1933 on the Prospectus for Registration Statement No. 333 - 193936 and was declared effective&#13;on September 30, 2014. The Company valued the Hercules Warrants issued using the Black-Scholes option pricing model and recorded&#13;a total of $476,261 as a direct deduction from the debt liability consistent with the presentation of a debt discount and are being&#13;amortized as interest expense using the effective interest method over the life of the loan. Also, in connection with each of the&#13;$5.0 million tranches, the Company was required to pay an end of term charge equal to 3.5% of each original loan amount at time&#13;of maturity. Therefore, these amounts totaling $350,000 were amortized as interest expense using the effective interest method&#13;over the life of the loan. For the three-period ended June 30, 2017 the Company incurred $11,731 in interest expense and amortized&#13;$17,685 as interest expense for deferred fees, debt discount and end of term charges in connection with the Hercules Credit Agreement.&#13;For the six-month period ended June 30, 2017, the Company incurred $56,386 in interest expense and amortized $35,370 as interest&#13;expense for deferred fees, debt discount and end of term charges in connection with the Hercules Credit Agreement&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;The loan balance and end of term charges on&#13;the Hercules Credit Agreement was paid in full in June 2017.&lt;/p&gt;</us-gaap:DebtDisclosureTextBlock>
    <us-gaap:StockholdersEquityNoteDisclosureTextBlock contextRef="From2018-01-01to2018-06-30">&lt;p style="margin: 0pt"&gt;&lt;/p&gt;&#13;&#13;&lt;table cellspacing="0" cellpadding="0" style="width: 100%; border-collapse: collapse"&gt;&#13;&lt;tr style="vertical-align: top"&gt;&#13;    &lt;td style="width: 48px; font: 12pt Times New Roman, Times, Serif"&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;Note 11.&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="font: 12pt Times New Roman, Times, Serif"&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;Stockholders&amp;#8217; Equity&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;/table&gt;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;In September 2015, the Company filed with the&#13;Securities and Exchange Commission (the SEC) a $75 million shelf registration statement on Form S-3 (the 2015 Shelf Registration&#13;Statement) (File No. 333-206789) that allows the Company to issue any combination of common stock, preferred stock or warrants&#13;to purchase common stock or preferred stock. This shelf registration was declared effective on September 25, 2015.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;i&gt;&lt;u&gt;Increase in the Number of Authorized&#13;Shares&lt;/u&gt;&lt;/i&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;At the 2016 Annual Meeting of Stockholders&#13;of the Company in June 2016, the Company&amp;#8217;s stockholders approved an increase in the number of the authorized shares of the&#13;Company&amp;#8217;s common stock from 75,000,000 shares to 112,500,000 shares. The number of the authorized shares of preferred stock&#13;remains at 100,000 shares. The aggregate number of shares of all classes of stock that the Company may issue, after giving effect&#13;to such amendment as approved by the stockholders, will be 112,600,000 shares.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;i&gt;&lt;u&gt;Reverse Stock Split&lt;/u&gt;&lt;/i&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;On May 26, 2017, the Company effected a 14-for-1&#13;reverse stock split of its common stock which was made effective for trading purposes as of the commencement of trading on May&#13;30, 2017. As of that date, each 14 shares of issued and outstanding common stock and equivalents was consolidated into one share&#13;of common stock. All shares have been restated to reflect the effects of the 14-for-1 reverse stock split. In addition, at the&#13;market open on May 30, 2017, the Company&amp;#8217;s common stock started trading under a new CUSIP number 15117N503 although the Company&amp;#8217;s&#13;ticker symbol, CLSN, remained unchanged.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;The reverse stock split was previously approved&#13;by the Company&amp;#8217;s stockholders at the 2017 Annual Meeting held on May 16, 2017, and the Company subsequently filed a Certificate&#13;of Amendment to its Certificate of Incorporation to effect the stock consolidation. The primary reasons for the reverse stock split&#13;and the amendment are:&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;table cellspacing="0" cellpadding="0" style="font: 12pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse"&gt;&#13;&lt;tr style="vertical-align: top"&gt;&#13;    &lt;td style="width: 24px; text-align: justify"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 24px; text-align: justify"&gt;&lt;font style="font-size: 10pt"&gt;&amp;#9679;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="text-align: justify"&gt;&lt;font style="font-size: 10pt"&gt;To increase the market price of the Company&amp;#8217;s common stock making it more attractive to a broader range of institutional and other investors, and&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: top"&gt;&#13;    &lt;td style="text-align: justify"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: justify"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: justify"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: top"&gt;&#13;    &lt;td style="text-align: justify"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: justify"&gt;&lt;font style="font-size: 10pt"&gt;&amp;#9679;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="text-align: justify"&gt;&lt;font style="font-size: 10pt"&gt;To provide the Company with additional capital resources and flexibility sufficient to execute its business plans including the establishment of strategic relationships with other companies and to ensure its ability to raise additional capital as necessary.&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;/table&gt;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;Immediately prior to the reverse stock split,&#13;the Company had 56,982,418 shares of common stock outstanding which consolidated into 4,070,172 shares of the Company&amp;#8217;s common&#13;stock. No fractional shares were issued in connection with the reverse stock split. Holders of fractional shares have been paid&#13;out in cash for the fractional portion with the Company&amp;#8217;s overall exposure for such payouts consisting of a nominal amount.&#13;The number of outstanding options and warrants were adjusted accordingly, with outstanding options being reduced from approximately&#13;2.4 million to approximately 0.2 million and outstanding warrants being reduced from approximately 33.5 million to approximately&#13;2.4 million.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;u&gt;October 2017 &lt;i&gt;Underwritten Offering&lt;/i&gt;&lt;/u&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;On October 27, 2017, the Company entered into&#13;an underwriting agreement (the &amp;#8220;Underwriting Agreement&amp;#8221;) with Oppenheimer &amp;#38; Co. Inc. (the &amp;#8220;Underwriter&amp;#8221;),&#13;relating to the issuance and sale (the &amp;#8220;Offering&amp;#8221;) of 2,640,000 shares (the &amp;#8220;Shares&amp;#8221;) of the Company&amp;#8217;s&#13;common stock, $0.01 par value per share (the &amp;#8220;Common Stock&amp;#8221;), and warrants to purchase an aggregate of 1,320,000 shares&#13;of Common Stock. Each share of Common Stock is being sold together with 0.5 warrants (the &amp;#8220;Investor Warrants&amp;#8221;), each&#13;whole Investor Warrant being exercisable for one share of Common Stock, at an offering price of $2.50 per share and related Investor&#13;Warrants.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;Pursuant to the terms of the Underwriting Agreement,&#13;the Underwriter agreed to purchase the Shares and related Investor Warrants from the Company at a price of $2.325 per share and&#13;related Investor Warrants. Each Investor Warrant is exercisable six months from the date of issuance. The Investor Warrants have&#13;an exercise price of $3.00 per whole share and expire five years from the date first exercisable.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;The Company received $6.6 million of gross&#13;proceeds from the sale of the Shares and Investor Warrant. This Offering was made pursuant to the Company&amp;#8217;s effective shelf&#13;registration statement on Form S-3 (File No. 333-206789) filed with the Securities and Exchange Commission on September 4, 2015,&#13;and declared effective on September 25, 2015, including the base prospectus dated September 25, 2017 included therein and the related&#13;prospectus supplement. The Company also issued to the Underwriter warrants to purchase up to 66,000 shares of the Company&amp;#8217;s&#13;common stock, such issuance being exempt from registration pursuant to Section 4(a)(2) of the Securities Act. Each Underwriter&#13;warrant is exercisable six months from the date of issuance, have an exercise price of $2.87 per whole share, and expire five years&#13;from the date first exercisable&lt;i&gt;.&lt;/i&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;i&gt;&amp;#160;&lt;/i&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;u&gt;July 6, 2017 &lt;i&gt;Common Stock Offering&lt;/i&gt;&lt;/u&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;On July 6, 2017, the Company entered into a&#13;securities purchase agreement with several investors, pursuant to which the Company agreed to issue and sell, in a registered direct&#13;offering, an aggregate of 2,050,000 shares of common stock of the Company at an offering price of $2.07 per share for gross proceeds&#13;of $4,243,500 before the deduction of the placement agent fee and offering expenses. In addition, the Company sold Pre-Funded Series&#13;CCC Warrants to purchase 385,000 shares of common stock (and the shares of common stock issuable upon exercise of the Pre-Funded&#13;Series CCC Warrants), in lieu of shares of common stock to the extent that the purchase of common stock would cause the beneficial&#13;ownership of the Purchaser, together with its affiliates and certain related parties, to exceed 9.99% of our common stock. The&#13;Pre-Funded Series CCC Warrants were sold at an offering price of $2.06 per share for gross proceeds of $793,100, are immediately&#13;exercisable for $0.01 per share of common stock and do not have an expiration date. In a concurrent private placement, the Company&#13;agreed to issue to each investor, for each share of common stock and pre-funded warrant purchased in the offering, a Series AAA&#13;Warrant and Series BBB Warrant, each to purchase one share of common stock. The Series AAA Warrants are initially exercisable six&#13;months following issuance and terminate five and one-half years following issuance. The Series AAA Warrants have an exercise price&#13;of $2.07 per share and are exercisable to purchase an aggregate of 2,435,000 shares of common stock. The Series BBB Warrants are&#13;immediately exercisable following issuance and terminate twelve months following issuance. The Series BBB Warrants have an exercise&#13;price of $4.75 per share and are exercisable to purchase an aggregate of 2,435,000 shares of common stock. Subject to limited exceptions,&#13;a holder of a Series AAA and Series BBB Warrant will not have the right to exercise any portion of its warrants if the holder,&#13;together with its affiliates, would beneficially own in excess of 9.99% of the number of shares of common stock outstanding immediately&#13;after giving effect to such exercise. During the fourth quarter of 2017, all 385,000 of the Series CCC Pre-Funded warrants were&#13;exercised in full.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;On October 4, 2017, the Company entered into&#13;letter agreements (the &amp;#8220;Exercise Agreements&amp;#8221;) with the holders of the Series AAA and Series BBB Warrants issued in&#13;the July 6, 2017 Common Stock Offering (the &amp;#8220;Exercising Holders&amp;#8221;). The Exercise Agreements amended the Series AAA Warrants&#13;to permit their immediate exercise. Prior to the execution of the Exercise Agreements, the Series AAA Warrants were not exercisable&#13;until January 11, 2018. Pursuant to the Exercise Agreements, the Exercising Holders and the Company agreed that the Exercising&#13;Holders would exercise all of their Existing Warrants with respect to 4,665,000 shares of Common Stock underlying such Existing&#13;Warrants. The Series AAA Warrants and Series BBB Warrants were exercised at a price of $2.07 per share and $4.75 per share, respectively,&#13;which were their respective original exercise prices. The Company received approximately $16.6 million in gross proceeds from the&#13;sale of these warrants.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;The Exercise Agreements also provide for the&#13;issuance of 1,166,250 Series DDD Warrants, each to purchase one share of Common Stock (the &amp;#8220;Series DDD Warrants&amp;#8221;).&#13;The Series DDD Warrants have an exercise price $6.20, are exercisable one year following issuance and terminate six months after&#13;they are initially exercisable. The Series DDD Warrants and the shares of Common Stock issuable upon the exercise of the Series&#13;DDD Warrants were offered pursuant to the exemption provided in Section 4(a)(2) under the Securities Act or Rule 506(b) promulgated&#13;thereunder. Pursuant to the Exercise Agreements, the Series DDD Warrants shall be substantially in the form of the Existing Warrants&#13;and the Company will be required to register for resale the shares of Common Stock underlying the Series DDD Warrants.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;u&gt;February 14, 2017 &lt;i&gt;Public Offering&lt;/i&gt;&lt;/u&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;On February 14, 2017, the Company entered into&#13;a securities purchase agreement whereby it sold, in a public offering (the February 14, 2017 Public Offering), an aggregate of&#13;1,384,704 shares of common stock of the Company at an offering price of $3.22 per share. In addition, the Company sold Series AA&#13;Warrants (the Series AA Warrants) to purchase up to 1,177,790 shares of common stock and Pre-Funded Series BB Warrants (the Pre-Funded&#13;Series BB Warrants) to purchase up to 185,713 shares of common stock. The Series AA Warrants have an exercise price of $3.22 per&#13;share, have a five-year life and are immediately exercisable. The Pre-Funded Series BB Warrants were offered at $3.08 per share,&#13;were immediately exercisable for $0.14 per share of common stock, do not have an expiration date and were issued in lieu of shares&#13;of common stock to the extent that the purchase of common stock would cause the beneficial ownership of the purchaser of such shares,&#13;together with its affiliates and certain related parties, to exceed 9.99% of our common stock. The Company received approximately&#13;$5.0 million in gross proceeds before the deduction of the placement agent fees and offering expenses (excluding any proceeds from&#13;the exercise of the warrants) in the February 14, 2017 Public Offering.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;In connection with the February 14, 2017 Public&#13;Offering, the Company filed with the Securities and Exchange Commission a registration statement on Form S-1 (Registration No.&#13;333-215321) on December 23, 2016, as amended by Pre-Effective Amendment No. 1 filed with the Commission on January 20, 2017, as&#13;further amended by Pre-Effective Amendment No. 2 filed with the Commission on February 13, 2017, as further amended by Pre-Effective&#13;Amendment No. 3 filed with the Commission on February 13, 2017 and as further amended by Pre-Effective Amendment No. 4 filed with&#13;the Commission on February 14, 2017 for the registration of the securities issued and sold under the Securities Act of 1933, as&#13;amended.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;As of December 31, 2017, all 185,713 of the&#13;Series BB Pre-Funded warrants were exercised in full. During 2017, we received approximately $2.4 million from the exercise of&#13;Series AA Warrants to purchase 747,254 shares of common stock.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;i&gt;&amp;#160;&lt;/i&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;i&gt;&lt;u&gt;Reduced Exercise Price of Warrants&lt;/u&gt;&lt;/i&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;On February 22, 2013, the Company entered into&#13;a securities purchase agreement with certain investors pursuant to which the Company agreed, among other things, to issue warrants&#13;(the &amp;#8220;2013 Warrants&amp;#8221;) to purchase up to 95,811 shares of our common stock at an exercise price of $74.34 per share&#13;to such investors in a registered direct offering. On January 15, 2014, the Company entered into a securities purchase agreement&#13;with certain investors pursuant to which the Company agreed, among other things, to issue warrants (the &amp;#8220;2014 Warrants&amp;#8221;)&#13;to purchase up to 64,348 shares of our common stock at an exercise price of $57.40 per share to such investors in a registered&#13;direct offering. On June 9, 2017, the Company entered into warrant exercise agreements (the &amp;#8220;Exercise Agreements&amp;#8221;)&#13;with certain holders of the 2013 Warrants, the 2014 Warrants and the June 2016 Warrants (the &amp;#8220;Exercising Holders&amp;#8221;),&#13;which Exercising Holders own, in the aggregate, warrants exercisable for 790,410 shares of our common stock. Pursuant to the Exercise&#13;Agreements, the Exercising Holders and the Company agreed that the Exercising Holders would exercise their 2013 Warrants, the 2014&#13;Warrants and the June 2016 Warrants with respect to 790,410 shares of our common stock underlying such warrants for a reduced exercise&#13;price equal to $2.70 per share. The Company received aggregate gross proceeds of approximately $2.1 million from the exercise of&#13;the 2013 Warrants, the 2014 Warrants and the June 2016 Warrants by the Exercising Holders.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;The reduced exercise price of the 2013 Warrants,&#13;the 2014 Warrants and the June 2016 Series C Warrants increased the fair value of the warrants by approximately $0.2 million. This&#13;increase in fair value is recorded as a deemed dividend in additional paid in capital due to the retained deficit and it increased&#13;the net loss available to common shareholders on the consolidate statement of operations.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;On May 27, 2015 entered into a securities purchase&#13;agreement with certain investors pursuant to which the Company agreed, among other things, to issue warrants (the &amp;#8220;2015 Warrants&amp;#8221;)&#13;to purchase up to 139,284 shares of the Company&amp;#8217;s common stock at an exercise price of $36.40 per share, to such investors&#13;in a registered direct offering. Between June 22, 2017 through June 26, 2017, the Company and holders of the 2015 Warrants and&#13;the December 2016 Warrants (the Exercising Investors) entered into agreements whereby the Company agreed that the Exercising investors&#13;would exercise their 2015 Warrants and the June 2016 Warrants with respect to 506,627 shares of our common stock underlying such&#13;warrants for a reduced exercise price equal to $1.65 per share. The Company received aggregate gross proceeds of approximately&#13;$0.8 million from the exercise of the 2015 Warrants and the June 2016 Warrants by the Exercising Investors.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;The reduced exercise price of the 2015 Warrants&#13;increased the fair value of the warrants by approximately $0.1 million. This increase in fair value is recorded as a deemed dividend&#13;in additional paid in capital due to the retained deficit and it increased the net loss available to common shareholders on the&#13;consolidate statement of operations.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;i&gt;&amp;#160;&lt;/i&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;i&gt;&lt;u&gt;Controlled Equity Offering&lt;/u&gt;&lt;/i&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;On February 1, 2013, the Company entered into&#13;a Controlled Equity Offering SM Sales Agreement (the &amp;#8220;ATM Agreement&amp;#8221;) with Cantor Fitzgerald &amp;#38; Co., as sales agent&#13;(&amp;#8220;Cantor&amp;#8221;), pursuant to which Celsion may offer and sell, from time to time, through Cantor, shares of our common stock&#13;having an aggregate offering price of up to $25.0 million (the &amp;#8220;ATM Shares&amp;#8221;) pursuant to the Company&amp;#8217;s previously&#13;filed and effective Registration Statement on Form S-3. Under the ATM Agreement, Cantor may sell ATM Shares by any method deemed&#13;to be an &amp;#8220;at-the-market&amp;#8221; offering as defined in Rule 415 promulgated under the Securities Act of 1933, as amended,&#13;including sales made directly on The NASDAQ Capital Market, on any other existing trading market for our common stock or to or&#13;through a market maker. From February 1, 2013 through June 30, 2018, the Company sold and issued an aggregate of 1,784,396 shares&#13;of common stock under the ATM Agreement, receiving approximately $12.8 million in gross proceeds.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;The Company is not obligated to sell any ATM&#13;Shares under the ATM Agreement. Subject to the terms and conditions of the ATM Agreement, Cantor will use commercially reasonable&#13;efforts, consistent with its normal trading and sales practices and applicable state and federal law, rules and regulations and&#13;the rules of The NASDAQ Capital Market, to sell ATM Shares from time to time based upon the Company&amp;#8217;s instructions, including&#13;any price, time or size limits or other customary parameters or conditions the Company may impose. In addition, pursuant to the&#13;terms and conditions of the ATM Agreement and subject to the instructions of the Company, Cantor may sell ATM Shares by any other&#13;method permitted by law, including in privately negotiated transactions.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;The ATM Agreement will terminate upon the earlier&#13;of (i) the sale of ATM Shares under the ATM Agreement having an aggregate offering price of $25 million or (ii) the termination&#13;of the ATM Agreement by Cantor or the Company. The ATM Agreement may be terminated by Cantor or the Company at any time upon 10&#13;days&amp;#8217; notice to the other party, or by Cantor at any time in certain circumstances, including the occurrence of a material&#13;adverse change in the Company. The Company pays Cantor a commission of 3.0% of the aggregate gross proceeds from each sale of ATM&#13;Shares and has agreed to provide Cantor with customary indemnification and contribution rights. The Company also reimbursed Cantor&#13;for legal fees and disbursements of $50,000 in connection with entering into the ATM Agreement.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;On October 2, 2015 and again on February 6,&#13;2018, we filed prospectus supplements to the base prospectus that forms a part of the 2015 Shelf Registration Statement, pursuant&#13;to which we may offer and sell up to $17.5 million of shares collectively of common stock from time to time under the ATM Agreement.&#13;In January 2018 and thus far in 2018, we have sold 457,070 shares of common stock for net proceeds of $1.3 million under the ATM.&#13;As of the date of this filing, we have approximately $12.2 million remaining under the ATM.&lt;/p&gt;</us-gaap:StockholdersEquityNoteDisclosureTextBlock>
    <us-gaap:DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock contextRef="From2018-01-01to2018-06-30">&lt;p style="margin: 0pt"&gt;&lt;/p&gt;&#13;&#13;&lt;table cellspacing="0" cellpadding="0" style="width: 100%; border-collapse: collapse"&gt;&#13;&lt;tr style="vertical-align: top"&gt;&#13;    &lt;td style="width: 48px; font: 12pt Times New Roman, Times, Serif"&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;Note 12.&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="font: 12pt Times New Roman, Times, Serif"&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;Stock-Based Compensation&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;/table&gt;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;The Company has long-term compensation plans&#13;that permit the granting of equity based-awards in the form of stock options, restricted stock, restricted stock units, stock appreciation&#13;rights, other stock awards, and performance awards.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;At the 2018 Annual Stockholders Meeting of&#13;the Company held on May 15, 2018, stockholders approved the Celsion Corporation 2018 Stock Incentive Plan (the 2018 Plan). The&#13;2018 Plan, as adopted, permits the granting of 2,700,000 shares of Celsion common stock as equity awards in the form of incentive&#13;stock options, nonqualified stock options, restricted stock, restricted stock units, stock appreciation rights, other stock awards,&#13;performance awards, or in any combination of the foregoing. Prior to the adoption of the 2018 Plan, the Company had maintained&#13;the Celsion Corporation 2007 Stock Incentive Plan (the 2007 Plan). The 2007 Plan permitted the granting of 688,531 shares of Celsion&#13;common stock as equity awards in the form of incentive stock options, nonqualified stock options, restricted stock, restricted&#13;stock units, stock appreciation rights, phantom stock, performance awards, or in any combination of the foregoing.&amp;#160;&amp;#160;The&#13;2018 Plan replaced the 2007 Plan although the 2007 Plan remains in effect for awards previously granted under the 2007 Plan. Under&#13;the terms of the 2018 Plan, any shares subject to an award under the 2007 Plan which are not delivered because of the expiration,&#13;forfeiture, termination or cash settlement of the award will become available for grant under the 2018 Plan.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;The Company has issued stock awards to employees&#13;and directors in the form of stock options and restricted stock. Options are generally granted with strike prices equal to the&#13;fair market value of a share of Celsion common stock on the date of grant. Incentive stock options may be granted to purchase shares&#13;of common stock at a price not less than 100% of the fair market value of the underlying shares on the date of grant, provided&#13;that the exercise price of any incentive stock option granted to an eligible employee owning more than 10% of the outstanding stock&#13;of Celsion must be at least 110% of such fair market value on the date of grant. Only officers and key employees may receive incentive&#13;stock options.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;Option and restricted stock awards vest upon&#13;terms determined by the Compensation Committee of the Board of Directors and are subject to accelerated vesting in the event of&#13;a change of control or certain terminations of employment. The Company issues new shares to satisfy its obligations from the exercise&#13;of options or the grant of restricted stock awards.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;As of June 30, 2018, there were a total of&#13;3,399,893 shares reserved, which were comprised of&amp;#160;3,034,741 shares subject to equity awards previously granted under the&#13;2018 Plan and 2007 Plan and 365,152 shares available for future issuance under the 2018 Plan.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;Total compensation cost charged related to&#13;employee stock options and restricted stock awards amounted to $3,217,633 and $676,918 for the three-month periods ended June 30,&#13;2018 and 2017, respectively. Total compensation cost charged related to employee stock options and restricted stock awards amounted&#13;to $3,371,301 and $804,592 for the six-month periods ended June 30, 2018 and 2017, respectively. As of June 30, 2018, there was&#13;$2.7 million of total unrecognized compensation cost related to non-vested stock-based compensation arrangements. That cost is&#13;expected to be recognized over a weighted-average period of 1.3 years. The weighted average grant date fair values of the stock&#13;option awards granted during six-month periods ended June 30, 2018 and 2017 was $2.23 and $2.32, respectively.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;A summary of stock option awards and restricted&#13;stock grants for the six-months ended June 30, 2018 is presented below:&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;table cellspacing="0" cellpadding="0" style="font: 12pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse"&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt; text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="6" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;Stock Options&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt; text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt; text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="6" style="border-bottom: black 1.5pt solid"&gt;&#13;        &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;Restricted Stock&lt;/b&gt;&lt;/p&gt;&#13;        &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;Awards&lt;/b&gt;&lt;/p&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt; text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt; text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="padding-bottom: 1.5pt"&gt;&#13;        &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;Weighted&lt;/b&gt;&lt;/p&gt;&#13;        &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;Average&lt;/b&gt;&lt;/p&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt; text-align: center"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;Equity Awards&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt; text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid"&gt;&#13;        &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;Options&lt;/b&gt;&lt;/p&gt;&#13;        &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;Outstanding&lt;/b&gt;&lt;/p&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt; text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt; text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid"&gt;&#13;        &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;Weighted&lt;/b&gt;&lt;/p&gt;&#13;        &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;Average&lt;/b&gt;&lt;/p&gt;&#13;        &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;Exercise&lt;/b&gt;&lt;/p&gt;&#13;        &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;Price&lt;/b&gt;&lt;/p&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt; text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt; text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid"&gt;&#13;        &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;Non-vested&lt;/b&gt;&lt;/p&gt;&#13;        &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;Restricted&lt;/b&gt;&lt;/p&gt;&#13;        &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;Stock&lt;/b&gt;&lt;/p&gt;&#13;        &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;Outstanding&lt;/b&gt;&lt;/p&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt; text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt; text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid"&gt;&#13;        &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;Weighted&lt;/b&gt;&lt;/p&gt;&#13;        &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;Average&lt;/b&gt;&lt;/p&gt;&#13;        &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;Grant&lt;/b&gt;&lt;/p&gt;&#13;        &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;Date&lt;/b&gt;&lt;/p&gt;&#13;        &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;Fair Value&lt;/b&gt;&lt;/p&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt; text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt; text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid"&gt;&#13;        &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;Contractual&lt;/b&gt;&lt;/p&gt;&#13;        &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;Terms of&lt;/b&gt;&lt;/p&gt;&#13;        &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;Equity&lt;/b&gt;&lt;/p&gt;&#13;        &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;Awards&lt;/b&gt;&lt;/p&gt;&#13;        &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;(in years)&lt;/b&gt;&lt;/p&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt; text-align: center"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td style="width: 34%"&gt;&lt;font style="font-size: 10pt"&gt;Equity awards outstanding at January 1, 2018&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 10%; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;703,442&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 10%; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;10.34&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 10%; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;&amp;#8211;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 10%; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;&amp;#8211;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 11%; text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td&gt;&lt;font style="font-size: 10pt"&gt;Equity awards granted&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;2,440,000&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;2.22&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;11,000&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;2.64&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td&gt;&lt;font style="font-size: 10pt"&gt;Vested and issued&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;&amp;#8211;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;&amp;#8211;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;(6,000&lt;/font&gt;&lt;/td&gt;&#13; 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   &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&lt;font style="font-size: 10pt"&gt;Equity awards forfeited, cancelled or expired&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;(113,701&lt;/font&gt;&lt;/td&gt;&#13; 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text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;3,029,741&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;4.48&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;5,000&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;2.61&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;9.6&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&lt;font style="font-size: 10pt"&gt;Aggregate intrinsic value of outstanding awards at June 30, 2018&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;1,913,490&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt; text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;1,700&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt; text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt; text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&lt;font style="font-size: 10pt"&gt;Equity awards exercisable at June 30, 2018&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;1,657,820&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;2.95&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt; text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt; text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;9.6&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&lt;font style="font-size: 10pt"&gt;Aggregate intrinsic value of awards exercisable at June 30, 2018&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;983,522&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt; text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt; text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt; text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt; text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;/table&gt;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;The fair values of stock options granted were&#13;estimated at the date of grant using the Black-Scholes option pricing model. The Black-Scholes option pricing model was originally&#13;developed for use in estimating the fair value of traded options, which have different characteristics from Celsion&amp;#8217;s stock&#13;options. The model is also sensitive to changes in assumptions, which can materially affect the fair value estimate. The Company&#13;used the following assumptions for determining the fair value of options granted under the Black-Scholes option pricing model:&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;table cellspacing="0" cellpadding="0" style="font: 12pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse"&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td style="text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt; text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="6" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;Six Months Ended June 30,&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt; text-align: center"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td style="text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt; text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;2018&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt; text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt; text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;2017&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt; text-align: center"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td style="width: 72%"&gt;&lt;font style="font-size: 10pt"&gt;Risk-free interest rate&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 11%; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;3.08&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font-size: 10pt"&gt;%&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 11%; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;2.21&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font-size: 10pt"&gt;%&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&lt;font style="font-size: 10pt"&gt;Expected volatility&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;100.0&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font-size: 10pt"&gt;%&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;90.4&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font-size: 10pt"&gt;%&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td&gt;&lt;font style="font-size: 10pt"&gt;Expected life (in years)&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;9.5 - 10.0&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;10.00&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&lt;font style="font-size: 10pt"&gt;Expected forfeiture rate&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;&amp;#8211;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font-size: 10pt"&gt;%&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;&amp;#8211;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font-size: 10pt"&gt;%&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td&gt;&lt;font style="font-size: 10pt"&gt;Expected dividend yield&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;&amp;#8211;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font-size: 10pt"&gt;%&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;&amp;#8211;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font-size: 10pt"&gt;%&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;/table&gt;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;Expected volatilities utilized in the model&#13;are based on historical volatility of the Company&amp;#8217;s stock price. The risk-free interest rate is derived from values assigned&#13;to U.S. Treasury bonds with terms that approximate the expected option lives in effect at the time of grant. Starting in 2017,&#13;the Company elected to account for any forfeitures when they occur.&lt;/p&gt;</us-gaap:DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock>
    <CLSN:EarnoutMilestoneLiabilityDisclosureTextBlock contextRef="From2018-01-01to2018-06-30">&lt;p style="margin: 0pt"&gt;&lt;/p&gt;&#13;&#13;&lt;table cellspacing="0" cellpadding="0" style="width: 100%; border-collapse: collapse"&gt;&#13;&lt;tr style="vertical-align: top"&gt;&#13;    &lt;td style="width: 48px; font: 12pt Times New Roman, Times, Serif"&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;Note 13.&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="font: 12pt Times New Roman, Times, Serif"&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;Earn-out Milestone Liability&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;/table&gt;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;The total aggregate purchase price for the&#13;EGEN Acquisition included potential future Earn-out Payments contingent upon achievement of certain milestones. The difference&#13;between the aggregate $30.4 million in future Earn-out Payments and the $13.9 million included in the fair value of the acquisition&#13;consideration at June 20, 2014 was based on the Company&amp;#8217;s risk-adjusted assessment of each milestone (10% to 67%) and utilizing&#13;a discount rate based on the estimated time to achieve the milestone (1.5 to 2.5 years). The earn-out milestone liability will&#13;be fair valued at the end of each quarter and any change in their value will be recognized in the financial statements.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;As of June 30, 2018, March 31, 2018 and December&#13;31, 2017, the Company fair valued these milestones at $13.1 million, $12.8 million and $12.5 million, respectively, and recognized&#13;a non-cash charge of $270,195 and $547,324 during the three and six months ended June 30, 2018 as a result of the change in the&#13;fair value of these milestones from the beginning of each period respectively.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;As of June 30, 2017, March 31, 2017 and December&#13;31, 2016, the Company fair valued these milestones at $13.8 million, $13.5 million and $13.2 million, respectively, and recognized&#13;a non-cash charge of $292,228 and $575,979 during the three and six months ended June 30, 2017 as a result of the change in the&#13;fair value of these milestones from the beginning of each period respectively.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;The following is a summary of the changes in&#13;the earn-out milestone liability for 2018:&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;table cellspacing="0" cellpadding="0" style="font: 12pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse"&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td style="width: 82%"&gt;&lt;font style="font-size: 10pt"&gt;Balance at January 1, 2018&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 15%; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;12,538,525&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&lt;font style="font-size: 10pt"&gt;Non-cash charge from the adjustment for the change in fair value included in net loss&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;547,324&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&lt;font style="font-size: 10pt"&gt;Balance at June 30, 2018&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;13,085,849&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;/table&gt;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;b&gt;&amp;#160;&lt;/b&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;The following is a schedule of the Company&amp;#8217;s&#13;risk-adjustment assessment of each milestone:&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;table cellspacing="0" cellpadding="0" style="font: 12pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse"&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;Date&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&#13;        &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;Risk-adjustment Assessment&lt;/b&gt;&lt;/p&gt;&#13;        &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;of each Milestone&lt;/b&gt;&lt;/p&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;Discount Rate&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&#13;        &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;Estimated Time&lt;/b&gt;&lt;/p&gt;&#13;        &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;to Achieve&lt;/b&gt;&lt;/p&gt;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td style="text-align: justify"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: center"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td style="width: 25%; text-align: justify"&gt;&lt;font style="font-size: 10pt"&gt;June 30, 2018&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 25%; text-align: center"&gt;&lt;font style="font-size: 10pt"&gt;35% to 80%&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 18%; text-align: center"&gt;&lt;font style="font-size: 10pt"&gt;9%&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 29%; text-align: center"&gt;&lt;font style="font-size: 10pt"&gt;0.83 to 1.00 year&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td style="text-align: justify"&gt;&lt;font style="font-size: 10pt"&gt;March 31, 2018&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: center"&gt;&lt;font style="font-size: 10pt"&gt;35% to 80%&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: center"&gt;&lt;font style="font-size: 10pt"&gt;9%&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: center"&gt;&lt;font style="font-size: 10pt"&gt;1.08 to 1.25 years&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td style="text-align: justify"&gt;&lt;font style="font-size: 10pt"&gt;December 31, 2017&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: center"&gt;&lt;font style="font-size: 10pt"&gt;35% to 80%&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: center"&gt;&lt;font style="font-size: 10pt"&gt;9%&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: center"&gt;&lt;font style="font-size: 10pt"&gt;1.33 to 1.50 years&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td style="text-align: justify"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: center"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td style="text-align: justify"&gt;&lt;font style="font-size: 10pt"&gt;June 30, 2017&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: center"&gt;&lt;font style="font-size: 10pt"&gt;50% to 80%&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: center"&gt;&lt;font style="font-size: 10pt"&gt;9%&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: center"&gt;&lt;font style="font-size: 10pt"&gt;1.50 to 2.00 years&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td style="text-align: justify"&gt;&lt;font style="font-size: 10pt"&gt;March 31, 2017&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: center"&gt;&lt;font style="font-size: 10pt"&gt;50% to 80%&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: center"&gt;&lt;font style="font-size: 10pt"&gt;9%&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: center"&gt;&lt;font style="font-size: 10pt"&gt;1.75 to 2.25 years&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td style="text-align: justify"&gt;&lt;font style="font-size: 10pt"&gt;December 31, 2016&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: center"&gt;&lt;font style="font-size: 10pt"&gt;50% to 80%&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: center"&gt;&lt;font style="font-size: 10pt"&gt;9%&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: center"&gt;&lt;font style="font-size: 10pt"&gt;2.00 to 2.50 years&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;/table&gt;&#13;&#13;&#13;&lt;p style="margin: 0pt"&gt;&lt;/p&gt;</CLSN:EarnoutMilestoneLiabilityDisclosureTextBlock>
    <us-gaap:CommitmentsAndContingenciesDisclosureTextBlock contextRef="From2018-01-01to2018-06-30">&lt;p style="margin: 0pt"&gt;&lt;/p&gt;&#13;&#13;&lt;table cellspacing="0" cellpadding="0" style="width: 100%; border-collapse: collapse"&gt;&#13;&lt;tr style="vertical-align: top"&gt;&#13;    &lt;td style="width: 48px; font: 12pt Times New Roman, Times, Serif"&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;Note 15.&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="font: 12pt Times New Roman, Times, Serif"&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;Contingent Liabilities and Commitments&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;/table&gt;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;In July 2011, the Company executed a lease&#13;(the &amp;#8220;Lease&amp;#8221;) with Brandywine Operating Partnership, L.P. (Brandywine), a Delaware limited partnership for a 10,870&#13;square foot premises located in Lawrenceville, New Jersey. In October 2011, the Company relocated its offices to Lawrenceville,&#13;New Jersey from Columbia, Maryland. The lease has a term of 66 months and provides for 6 months of rent free, with the first monthly&#13;rent payment of approximately $23,000 due and paid in April 2012. Also, as required by the Lease, the Company provided Brandywine&#13;with an irrevocable and unconditional standby letter of credit for $250,000, which the Company secured with an escrow deposit at&#13;its banking institution of this same amount. The standby letter of credit was reduced by $50,000 on each of the 19th, 31st and&#13;43rd months from the initial term, and the remaining $100,000 amount was reduced when the Lease term expired in April 2017. In&#13;late 2015, Lenox Drive Office Park LLC, purchased the real estate and office building and assumed the lease. This lease was set&#13;to expire on April 30, 2017. In April 2017, the Company and the landlord amended the Lease effective May 1, 2017. The Lease amendment&#13;extended the term of the agreement for an additional 64 months, reduced the premises to 7,565 square feet, reduced the monthly&#13;rent and provided four months free rent. The monthly rent will range from approximately $18,900 in the first year to approximately&#13;$20,500 in the final year of the amendment. The Company also has a one-time option to cancel the lease as of the 24th month after&#13;the commencement date of the Lease amendment.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;In connection with the EGEN Asset Purchase&#13;Agreement in June 2014, the Company assumed the existing lease with another landlord for an 11,500 square foot premises located&#13;in Huntsville Alabama. This lease expired at the end of January 2018. In January 2018, the Company and this landlord entered into&#13;a new 60-month lease which reduced the premises to 9,049 square feet with rent payments of approximately $18,100 per month.&lt;/p&gt;</us-gaap:CommitmentsAndContingenciesDisclosureTextBlock>
    <CLSN:LicensingTransactionTextBlock contextRef="From2018-01-01to2018-06-30">&lt;p style="margin: 0pt"&gt;&lt;/p&gt;&#13;&#13;&lt;table cellspacing="0" cellpadding="0" style="width: 100%; border-collapse: collapse"&gt;&#13;&lt;tr style="vertical-align: top"&gt;&#13;    &lt;td style="width: 48px; font: 12pt Times New Roman, Times, Serif"&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;Note 16.&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="font: 12pt Times New Roman, Times, Serif"&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;Technology Development and Licensing Agreements&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;/table&gt;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;b&gt;&amp;#160;&lt;/b&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;On May 7, 2012, the Company entered into a&#13;long-term commercial supply agreement with Zhejiang Hisun Pharmaceutical Co. Ltd. (Hisun) for the production of ThermoDox&amp;#174;&#13;in the China territory. In accordance with the terms of the agreement, Hisun will be responsible for providing all of the technical&#13;and regulatory support services, including the costs of all technical transfer, registration and bioequivalence studies, technical&#13;transfer costs, Celsion consultative support costs and the purchase of any necessary equipment and additional facility costs necessary&#13;to support capacity requirements for the manufacture of ThermoDox&amp;#174;. Celsion will repay Hisun for the aggregate amount of these&#13;development costs and fees commencing on the successful completion of three registration batches of ThermoDox&amp;#174;. Hisun is also&#13;obligated to certain performance requirements under the agreement. The agreement will initially be limited to a percentage of the&#13;production requirements of ThermoDox&amp;#174; in the China territory with Hisun retaining an option for additional global supply after&#13;local regulatory approval in the China territory. In addition, Hisun will collaborate with Celsion around the regulatory approval&#13;activities for ThermoDox&amp;#174; with the China State Food and Drug Administration (CHINA FDA). During the first quarter of 2015,&#13;Hisun completed the successful manufacture of three registration batches of ThermoDox&amp;#174;.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;On January 18, 2013, we entered into a technology&#13;development contract with Hisun, pursuant to which Hisun paid us a non-refundable research and development fee of $5 million to&#13;support our development of ThermoDox&lt;sup&gt;&amp;#174;&lt;/sup&gt; in mainland China, Hong Kong and Macau (the China territory). Following our&#13;announcement on January 31, 2013 that the HEAT study failed to meet its primary endpoint, Celsion and Hisun have agreed that the&#13;Technology Development Contract entered into on January 18, 2013 will remain in effect while the parties continue to collaborate&#13;and are evaluating the next steps in relation to ThermoDox&lt;sup&gt;&amp;#174;&lt;/sup&gt;, which include the sub-group analysis of patients in&#13;the Phase III HEAT Study for the hepatocellular carcinoma clinical indication and other activities to further the development of&#13;ThermoDox&lt;sup&gt;&amp;#174;&lt;/sup&gt; for the Greater China market. The $5.0 million received as a non-refundable payment from Hisun in the&#13;first quarter 2013 has been recorded to deferred revenue and will continue to be amortized over the 10-year term of the agreement,&#13;until such time as the parties find a mutually acceptable path forward on the development of ThermoDox&lt;sup&gt;&amp;#174;&lt;/sup&gt; based on&#13;findings of the ongoing post-study analysis of the HEAT Study data.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 15.2pt; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;On July 19, 2013, the Company and Hisun entered&#13;into a Memorandum of Understanding to pursue ongoing collaborations for the continued clinical development of ThermoDox&amp;#174; as&#13;well as the technology transfer relating to the commercial manufacture of ThermoDox&amp;#174; for the China territory. This expanded&#13;collaboration includes development of the next generation liposomal formulation with the goal of creating safer, more efficacious&#13;versions of marketed cancer chemotherapeutics.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;Among the key provisions of the Celsion-Hisun&#13;Memorandum of Understanding are:&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;table cellspacing="0" cellpadding="0" style="font: 12pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse"&gt;&#13;&lt;tr style="vertical-align: top"&gt;&#13;    &lt;td style="width: 43px; text-align: justify"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 24px; text-align: justify"&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;&amp;#9679;&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="text-align: justify"&gt;&lt;font style="font-size: 10pt"&gt;Hisun will provide the Company with non-dilutive financing and the investment necessary to complete the technology transfer of its proprietary manufacturing process and the production of registration batches for the China territory;&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: top"&gt;&#13;    &lt;td style="text-align: justify"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: justify"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: justify"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: top"&gt;&#13;    &lt;td style="text-align: justify"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: justify"&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;&amp;#9679;&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="text-align: justify"&gt;&lt;font style="font-size: 10pt"&gt;Hisun will collaborate with the Company around the clinical and regulatory approval activities for ThermoDox&amp;#174; as well as other liposomal formations with the CHINA FDA; and&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: top"&gt;&#13;    &lt;td style="text-align: justify"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: justify"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: justify"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: top"&gt;&#13;    &lt;td style="text-align: justify"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: justify"&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;&amp;#9679;&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="text-align: justify"&gt;&lt;font style="font-size: 10pt"&gt;Hisun will be granted a right of first offer for a commercial license to ThermoDox&amp;#174; for the sale and distribution of ThermoDox&amp;#174; in the China territory.&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;/table&gt;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;On August 8, 2016, we signed a Technology Transfer,&#13;Manufacturing and Commercial Supply Agreement (&amp;#8220;GEN-1 Agreement&amp;#8221;) with Hisun to pursue an expanded partnership for&#13;the technology transfer relating to the clinical and commercial manufacture and supply of GEN-1, Celsion&amp;#8217;s proprietary gene&#13;mediated, IL-12 immunotherapy, for the greater China territory, with the option to expand into other countries in the rest of the&#13;world after all necessary regulatory approvals are in effect. The GEN-1 Agreement will help to support supply for both ongoing&#13;and planned clinical studies in the U.S., and for potential future studies of GEN-1 in China. GEN-1 is currently being evaluated&#13;by Celsion in first line ovarian cancer patients.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;Key provisions of the GEN-1 Agreement are as&#13;follows:&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 17.4pt"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;table cellspacing="0" cellpadding="0" style="font: 12pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse"&gt;&#13;&lt;tr style="vertical-align: top"&gt;&#13;    &lt;td style="width: 43px"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 24px"&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;&amp;#9679;&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="text-align: justify"&gt;&lt;font style="font-size: 10pt"&gt;the GEN-1 Agreement has targeted unit costs for clinical supplies of GEN-1 that are substantially competitive with the Company&amp;#8217;s current suppliers;&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: top"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: justify"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: top"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;&amp;#9679;&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="text-align: justify"&gt;&lt;font style="font-size: 10pt"&gt;once approved, the cost structure for GEN-1 will support rapid market adoption and significant gross margins across global markets;&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: top"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: justify"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: top"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;&amp;#9679;&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="text-align: justify"&gt;&lt;font style="font-size: 10pt"&gt;Celsion will provide Hisun a certain percentage of China&amp;#8217;s commercial unit demand, and separately of global commercial unit demand, subject to regulatory approval;&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: top"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: justify"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: top"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;&amp;#9679;&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="text-align: justify"&gt;&lt;font style="font-size: 10pt"&gt;Hisun and Celsion will commence technology transfer activities relating to the manufacture of GEN-1, including all studies required by CFDA for site approval; and&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: top"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: justify"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: top"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;&amp;#9679;&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="text-align: justify"&gt;&lt;font style="font-size: 10pt"&gt;Hisun will collaborate with Celsion around the regulatory approval activities for GEN-1 with the CFDA. A local China partner affords Celsion access to accelerated CFDA review and potential regulatory exclusivity for the approved indication.&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;/table&gt;&#13;&#13;&#13;&lt;p style="margin: 0pt"&gt;&lt;/p&gt;</CLSN:LicensingTransactionTextBlock>
    <us-gaap:ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock contextRef="From2018-01-01to2018-06-30">&lt;p style="margin: 0pt"&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;Assets and liabilities measured at fair value&#13;are summarized below:&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;table cellspacing="0" cellpadding="0" style="font: 12pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse"&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td style="text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt; text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;Total Fair Value&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt; text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt; text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid"&gt;&#13;        &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;Quoted Prices&lt;/b&gt;&lt;/p&gt;&#13;        &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;In Active Markets&lt;/b&gt;&lt;/p&gt;&#13;        &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;For Identical Assets/Liabilities (Level 1)&lt;/b&gt;&lt;/p&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt; text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt; text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid"&gt;&#13;        &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;Significant Other Observable Inputs&lt;/b&gt;&lt;/p&gt;&#13;        &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;(Level 2)&lt;/b&gt;&lt;/p&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt; text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt; text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid"&gt;&#13;        &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;Significant Unobservable Inputs&lt;/b&gt;&lt;/p&gt;&#13;        &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;(Level 3)&lt;/b&gt;&lt;/p&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt; text-align: center"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td style="width: 40%"&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;Assets:&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 11%; text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 15%; text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 11%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 11%; text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td&gt;&lt;font style="font-size: 10pt"&gt;Recurring items as of June 30, 2018&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td style="padding-bottom: 2.5pt; padding-left: 10pt"&gt;&lt;font style="font-size: 10pt"&gt;Investment securities, available for sale&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13; 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text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;&amp;#9472;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;&amp;#9472;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&lt;font style="font-size: 10pt"&gt;Recurring items as of December 31, 2017&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td style="padding-bottom: 2.5pt; padding-left: 10pt"&gt;&lt;font style="font-size: 10pt"&gt;Investment securities, available for sale&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;12,724,020&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;12,724,020&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;&amp;#9472;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;&amp;#9472;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;Liabilities:&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td&gt;&lt;font style="font-size: 10pt"&gt;Recurring items as of June 30, 2018&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td style="padding-bottom: 2.5pt; padding-left: 10pt"&gt;&lt;font style="font-size: 10pt"&gt;Earn-out milestone liability (Note 13)&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;13,085,849&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;&amp;#9472;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;&amp;#9472;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;13,085,849&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&lt;font style="font-size: 10pt"&gt;Recurring items as of December 31, 2017&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td style="padding-bottom: 2.5pt; padding-left: 10pt"&gt;&lt;font style="font-size: 10pt"&gt;Earn-out milestone liability (Note 13)&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;12,538,525&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;&amp;#9472;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;&amp;#9472;&amp;#160;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;12,538,525&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;/table&gt;&#13;&#13;&#13;&lt;p style="margin: 0pt"&gt;&lt;/p&gt;</us-gaap:ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock>
    <us-gaap:ScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedTableTextBlock contextRef="From2018-01-01to2018-06-30">&lt;p style="margin: 0pt"&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;The following table summarizes the fair values&#13;of these assets acquired and liabilities assumed related to the acquisition.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;table cellspacing="0" cellpadding="0" style="font: 12pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse"&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td style="width: 82%"&gt;&lt;font style="font-size: 10pt"&gt;Property and equipment, net&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 15%; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;35,000&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&lt;font style="font-size: 10pt"&gt;In-process research and development&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;24,211,000&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td&gt;&lt;font style="font-size: 10pt"&gt;Other Intangible assets (Covenant not to compete)&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;1,591,000&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&lt;font style="font-size: 10pt"&gt;Goodwill&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;1,976,000&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td&gt;&lt;font style="font-size: 10pt"&gt;Total assets:&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;27,813,000&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&lt;font style="font-size: 10pt"&gt;Accounts payable and accrued liabilities&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;(235,000&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&lt;font style="font-size: 10pt"&gt;)&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&lt;font style="font-size: 10pt"&gt;Net assets acquired&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;27,578,000&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;/table&gt;&#13;&#13;&#13;&lt;p style="margin: 0pt"&gt;&lt;/p&gt;</us-gaap:ScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedTableTextBlock>
    <us-gaap:ScheduleOfAccruedLiabilitiesTableTextBlock contextRef="From2018-01-01to2018-06-30">&lt;p style="margin: 0pt"&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;Other accrued liabilities as of June 30, 2018&#13;and December 31, 2017 include the following:&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;table cellspacing="0" cellpadding="0" style="font: 12pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse"&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;June 30, 2018&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;December 31, 2017&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td style="width: 62%; text-align: justify"&gt;&lt;font style="font-size: 10pt"&gt;Amounts due to contract research organizations and &lt;/font&gt;&lt;br /&gt;&#13;&lt;font style="font-size: 10pt"&gt;other contractual agreements&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 16%; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;908,556&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 16%; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;665,373&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&lt;font style="font-size: 10pt"&gt;Accrued payroll and related benefits&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;733,539&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;1,258,265&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td&gt;&lt;font style="font-size: 10pt"&gt;Accrued professional fees&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;370,298&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;264,668&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&lt;font style="font-size: 10pt"&gt;Other&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;20,000&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;94,521&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;Total&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;2,032,393&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;2,282,827&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;/table&gt;&#13;&#13;&#13;&lt;p style="margin: 0pt"&gt;&lt;/p&gt;</us-gaap:ScheduleOfAccruedLiabilitiesTableTextBlock>
    <CLSN:ScheduleOfSharebasedCompensationStockOptionsAndRestrictedStockAwardsActivityTableTextBlock contextRef="From2018-01-01to2018-06-30">&lt;p style="margin: 0pt"&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;A summary of stock option awards and restricted&#13;stock grants for the six-months ended June 30, 2018 is presented below:&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;table cellspacing="0" cellpadding="0" style="font: 12pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse"&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt; text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="6" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;Stock Options&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt; text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt; text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="6" style="border-bottom: black 1.5pt solid"&gt;&#13;        &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;Restricted Stock&lt;/b&gt;&lt;/p&gt;&#13;        &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;Awards&lt;/b&gt;&lt;/p&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt; text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt; text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="padding-bottom: 1.5pt"&gt;&#13;        &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;Weighted&lt;/b&gt;&lt;/p&gt;&#13;        &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;Average&lt;/b&gt;&lt;/p&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt; text-align: center"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;Equity Awards&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt; text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid"&gt;&#13;        &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;Options&lt;/b&gt;&lt;/p&gt;&#13;        &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;Outstanding&lt;/b&gt;&lt;/p&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt; text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt; text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid"&gt;&#13;        &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;Weighted&lt;/b&gt;&lt;/p&gt;&#13;        &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;Average&lt;/b&gt;&lt;/p&gt;&#13;        &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;Exercise&lt;/b&gt;&lt;/p&gt;&#13;        &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;Price&lt;/b&gt;&lt;/p&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt; text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt; text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid"&gt;&#13;        &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;Non-vested&lt;/b&gt;&lt;/p&gt;&#13;        &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;Restricted&lt;/b&gt;&lt;/p&gt;&#13;        &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;Stock&lt;/b&gt;&lt;/p&gt;&#13;        &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;Outstanding&lt;/b&gt;&lt;/p&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt; text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt; text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid"&gt;&#13;        &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;Weighted&lt;/b&gt;&lt;/p&gt;&#13;        &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;Average&lt;/b&gt;&lt;/p&gt;&#13;        &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;Grant&lt;/b&gt;&lt;/p&gt;&#13;        &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;Date&lt;/b&gt;&lt;/p&gt;&#13;        &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;Fair Value&lt;/b&gt;&lt;/p&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt; text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt; text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid"&gt;&#13;        &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;Contractual&lt;/b&gt;&lt;/p&gt;&#13;        &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;Terms of&lt;/b&gt;&lt;/p&gt;&#13;        &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;Equity&lt;/b&gt;&lt;/p&gt;&#13;        &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;Awards&lt;/b&gt;&lt;/p&gt;&#13;        &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;(in years)&lt;/b&gt;&lt;/p&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt; text-align: center"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td style="width: 34%"&gt;&lt;font style="font-size: 10pt"&gt;Equity awards outstanding at January 1, 2018&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 10%; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;703,442&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 10%; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;10.34&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13; 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   &lt;td style="padding-bottom: 2.5pt; text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt; text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&lt;font style="font-size: 10pt"&gt;Equity awards exercisable at June 30, 2018&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;1,657,820&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;2.95&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt; text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt; text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;9.6&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&lt;font style="font-size: 10pt"&gt;Aggregate intrinsic value of awards exercisable at June 30, 2018&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;983,522&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt; text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt; text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt; text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt; text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;/table&gt;&#13;&#13;&#13;&lt;p style="margin: 0pt"&gt;&lt;/p&gt;</CLSN:ScheduleOfSharebasedCompensationStockOptionsAndRestrictedStockAwardsActivityTableTextBlock>
    <us-gaap:ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock contextRef="From2018-01-01to2018-06-30">&lt;p style="margin: 0pt"&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;The Company used the following assumptions&#13;for determining the fair value of options granted under the Black-Scholes option pricing model:&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;table cellspacing="0" cellpadding="0" style="font: 12pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse"&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td style="text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt; text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="6" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;Six Months Ended June 30,&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt; text-align: center"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td style="text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt; text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;2018&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt; text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt; text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;2017&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt; text-align: center"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td style="width: 72%"&gt;&lt;font style="font-size: 10pt"&gt;Risk-free interest rate&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 11%; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;3.08&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font-size: 10pt"&gt;%&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 11%; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;2.21&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font-size: 10pt"&gt;%&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&lt;font style="font-size: 10pt"&gt;Expected volatility&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;100.0&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font-size: 10pt"&gt;%&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;90.4&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font-size: 10pt"&gt;%&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td&gt;&lt;font style="font-size: 10pt"&gt;Expected life (in years)&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;9.5 - 10.0&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;10.00&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&lt;font style="font-size: 10pt"&gt;Expected forfeiture rate&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;&amp;#8211;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font-size: 10pt"&gt;%&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;&amp;#8211;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font-size: 10pt"&gt;%&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td&gt;&lt;font style="font-size: 10pt"&gt;Expected dividend yield&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;&amp;#8211;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font-size: 10pt"&gt;%&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;&amp;#8211;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font-size: 10pt"&gt;%&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;/table&gt;&#13;&#13;&#13;&lt;p style="margin: 0pt"&gt;&lt;/p&gt;</us-gaap:ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock>
    <CLSN:ScheduleOfChangesInEarnOutMilestoneLiabilitiesTableTextBlock contextRef="From2018-01-01to2018-06-30">&lt;p style="margin: 0pt"&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;The following is a summary of the changes in&#13;the earn-out milestone liability for 2018:&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;table cellspacing="0" cellpadding="0" style="font: 12pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse"&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td style="width: 82%"&gt;&lt;font style="font-size: 10pt"&gt;Balance at January 1, 2018&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 15%; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;12,538,525&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&lt;font style="font-size: 10pt"&gt;Non-cash charge from the adjustment for the change in fair value included in net loss&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;547,324&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&lt;font style="font-size: 10pt"&gt;Balance at June 30, 2018&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;13,085,849&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;/table&gt;&#13;&#13;&#13;&lt;p style="margin: 0pt"&gt;&lt;/p&gt;</CLSN:ScheduleOfChangesInEarnOutMilestoneLiabilitiesTableTextBlock>
    <CLSN:ScheduleOfMilestoneRiskAdjustmentAssessmentTableTextBlock contextRef="From2018-01-01to2018-06-30">&lt;p style="margin: 0pt"&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;The following is a schedule of the Company&amp;#8217;s&#13;risk-adjustment assessment of each milestone:&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;table cellspacing="0" cellpadding="0" style="font: 12pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse"&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;Date&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&#13;        &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;Risk-adjustment Assessment&lt;/b&gt;&lt;/p&gt;&#13;        &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;of each Milestone&lt;/b&gt;&lt;/p&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;Discount Rate&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&#13;        &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;Estimated Time&lt;/b&gt;&lt;/p&gt;&#13;        &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;to Achieve&lt;/b&gt;&lt;/p&gt;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td style="text-align: justify"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: center"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td style="width: 25%; text-align: justify"&gt;&lt;font style="font-size: 10pt"&gt;June 30, 2018&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 25%; text-align: center"&gt;&lt;font style="font-size: 10pt"&gt;35% to 80%&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 18%; text-align: center"&gt;&lt;font style="font-size: 10pt"&gt;9%&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 29%; text-align: center"&gt;&lt;font style="font-size: 10pt"&gt;0.83 to 1.00 year&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td style="text-align: justify"&gt;&lt;font style="font-size: 10pt"&gt;March 31, 2018&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: center"&gt;&lt;font style="font-size: 10pt"&gt;35% to 80%&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: center"&gt;&lt;font style="font-size: 10pt"&gt;9%&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: center"&gt;&lt;font style="font-size: 10pt"&gt;1.08 to 1.25 years&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td style="text-align: justify"&gt;&lt;font style="font-size: 10pt"&gt;December 31, 2017&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: center"&gt;&lt;font style="font-size: 10pt"&gt;35% to 80%&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: center"&gt;&lt;font style="font-size: 10pt"&gt;9%&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: center"&gt;&lt;font style="font-size: 10pt"&gt;1.33 to 1.50 years&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td style="text-align: justify"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: center"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td style="text-align: justify"&gt;&lt;font style="font-size: 10pt"&gt;June 30, 2017&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: center"&gt;&lt;font style="font-size: 10pt"&gt;50% to 80%&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: center"&gt;&lt;font style="font-size: 10pt"&gt;9%&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: center"&gt;&lt;font style="font-size: 10pt"&gt;1.50 to 2.00 years&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td style="text-align: justify"&gt;&lt;font style="font-size: 10pt"&gt;March 31, 2017&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: center"&gt;&lt;font style="font-size: 10pt"&gt;50% to 80%&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: center"&gt;&lt;font style="font-size: 10pt"&gt;9%&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: center"&gt;&lt;font style="font-size: 10pt"&gt;1.75 to 2.25 years&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td style="text-align: justify"&gt;&lt;font style="font-size: 10pt"&gt;December 31, 2016&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: center"&gt;&lt;font style="font-size: 10pt"&gt;50% to 80%&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: center"&gt;&lt;font style="font-size: 10pt"&gt;9%&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: center"&gt;&lt;font style="font-size: 10pt"&gt;2.00 to 2.50 years&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;/table&gt;&#13;&#13;&#13;&lt;p style="margin: 0pt"&gt;&lt;/p&gt;</CLSN:ScheduleOfMilestoneRiskAdjustmentAssessmentTableTextBlock>
    <CLSN:ScheduleOfCostFairValueAndMaturitiesOfShorttermInvestmentsTableTextBlock contextRef="From2018-01-01to2018-06-30">&lt;p style="margin: 0pt"&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;A summary of the cost, fair value and maturities&#13;of the Company&amp;#8217;s short-term investments is as follows:&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;table cellspacing="0" cellpadding="0" style="font: 12pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse"&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="6" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;June 30, 2018&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="6" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;December 31, 2017&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;Cost&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;Fair Value&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;Cost&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;Fair Value&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;Short-term investments&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td style="width: 48%"&gt;&lt;font style="font-size: 10pt"&gt;Certificate of deposit&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 10%; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;1,714,375&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 10%; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;1,721,698&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 10%; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;-&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 10%; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;-&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&lt;font style="font-size: 10pt"&gt;Corporate debt securities&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;11,731,979&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;11,720,409&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;12,734,184&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;12,724,020&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;Total&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;13,446,354&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;13,442,107&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;12,734,184&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;12,724,020&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;/table&gt;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;table cellspacing="0" cellpadding="0" style="font: 12pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse"&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="6" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;June 30, 2018&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="6" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;December 31, 2017&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;Cost&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;Fair Value&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;Cost&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;Fair Value&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;Short-term investment maturities&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td style="width: 48%"&gt;&lt;font style="font-size: 10pt"&gt;Within 3 months&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 10%; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;4,241,961&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 10%; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;4,244,210&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 10%; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;-&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 10%; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;-&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&lt;font style="font-size: 10pt"&gt;Between 3-12 months&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;9,204,393&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;9,197,897&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;12,734,184&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;12,724,020&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;Total&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;13,446,354&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;13,442,107&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;12,734,184&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;12,724,020&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;/table&gt;&#13;&#13;&#13;&lt;p style="margin: 0pt"&gt;&lt;/p&gt;</CLSN:ScheduleOfCostFairValueAndMaturitiesOfShorttermInvestmentsTableTextBlock>
    <us-gaap:InvestmentIncomeTextBlock contextRef="From2018-01-01to2018-06-30">&lt;p style="margin: 0pt"&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;Investment income, which includes net realized&#13;losses on sales of available for sale securities and investment income interest and dividends, is summarized as follows:&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;table cellspacing="0" cellpadding="0" style="font: 12pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse"&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="6" style="border-bottom: black 1.5pt solid"&gt;&#13;        &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;Three Months Ended&lt;/b&gt;&lt;/p&gt;&#13;        &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;June 30,&lt;/b&gt;&lt;/p&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;2018&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;2017&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td style="width: 72%"&gt;&lt;font style="font-size: 10pt"&gt;Interest and dividends accrued and paid&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 11%; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;69,559&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 11%; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;1,426&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&lt;font style="font-size: 10pt"&gt;Realized gains&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;3,902&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;-&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&lt;font style="font-size: 10pt"&gt;Investment income, net&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;73,461&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;1,426&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;/table&gt;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;table cellspacing="0" cellpadding="0" style="font: 12pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse"&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="6" style="border-bottom: black 1.5pt solid"&gt;&#13;        &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;Six Months Ended&lt;/b&gt;&lt;/p&gt;&#13;        &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;June 30,&lt;/b&gt;&lt;/p&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;2018&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;2017&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td style="width: 72%"&gt;&lt;font style="font-size: 10pt"&gt;Interest and dividends accrued and paid&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 11%; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;138,848&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 11%; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;3,417&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&lt;font style="font-size: 10pt"&gt;Realized gains&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;8,337&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;-&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&lt;font style="font-size: 10pt"&gt;Investment income, net&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;147,185&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;3,417&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;/table&gt;&#13;&#13;&#13;&lt;p style="margin: 0pt"&gt;&lt;/p&gt;</us-gaap:InvestmentIncomeTextBlock>
    <us-gaap:ScheduleOfUnrealizedLossOnInvestmentsTableTextBlock contextRef="From2018-01-01to2018-06-30">&lt;p style="margin: 0pt"&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;The following table shows the Company&amp;#8217;s&#13;investment securities gross unrealized losses and fair value by investment category and length of time that individual securities&#13;have been in a continuous unrealized loss position at June 30, 2018 and December 31, 2017. The Company has reviewed individual&#13;securities to determine whether a decline in fair value below the amortizable cost basis is other than temporary.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;table cellspacing="0" cellpadding="0" style="font: 12pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse"&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="6" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;June 30, 2018&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="6" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;December 31, 2017&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;Available for sale securities&lt;/b&gt; (all unrealized holding gains and losses are less than 12 months at date of measurement)&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid; text-align: center"&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;Fair Value&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt; text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid"&gt;&#13;        &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;Unrealized&lt;/b&gt;&lt;/p&gt;&#13;        &lt;p style="font: 10pt Times New Roman, Times, Serif; 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background-color: #CCEEFF"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&lt;font style="font-size: 10pt"&gt;Warrants outstanding at June 30, 2018&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;3,248,516&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;5.14&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&lt;font style="font-size: 10pt"&gt;Aggregate intrinsic value of outstanding warrants at June 30, 2018&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;119,686&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt; text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&lt;font style="font-size: 10pt"&gt;Weighted average remaining contractual terms at June 30, 2018 (in years)&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;3.49&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt; text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;/table&gt;&#13;&#13;&#13;&lt;p style="margin: 0pt"&gt;&lt;/p&gt;</CLSN:WarrantsTextBlock>
    <us-gaap:ScheduleOfMaturitiesOfLongTermDebtTableTextBlock contextRef="From2018-01-01to2018-06-30">&lt;p style="margin: 0pt"&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;Following is a schedule of future principle&#13;payments, net of unamortized debt discounts and amortized end of term charges, due on the Horizon Credit Agreement:&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;table cellspacing="0" cellpadding="0" style="font: 12pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse"&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid"&gt;&#13;        &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;For the year&lt;/b&gt;&lt;/p&gt;&#13;        &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;ending&lt;/b&gt;&lt;/p&gt;&#13;        &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;June 30&lt;/b&gt;&lt;/p&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td&gt;&lt;font style="font-size: 10pt"&gt;2019&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;&amp;#8211;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&lt;font style="font-size: 10pt"&gt;2020&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;&amp;#8211;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td style="width: 79%"&gt;&lt;font style="font-size: 10pt"&gt;2021&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 18%; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;4,583,333&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&lt;font style="font-size: 10pt"&gt;2022&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;5,000,000&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&lt;font style="font-size: 10pt"&gt;2023 and thereafter&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;416,667&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td&gt;&lt;font style="font-size: 10pt"&gt;Subtotal of future principle payments&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;10,000,000&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&lt;font style="font-size: 10pt"&gt;Net of unamortized debt issuance costs&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;(777,879&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&lt;font style="font-size: 10pt"&gt;)&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td style="padding-bottom: 2.5pt; padding-left: 10pt"&gt;&lt;font style="font-size: 10pt"&gt;Total&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;9,222,121&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;/table&gt;&#13;&#13;&#13;&lt;p style="margin: 0pt"&gt;&lt;/p&gt;</us-gaap:ScheduleOfMaturitiesOfLongTermDebtTableTextBlock>
    <us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths contextRef="AsOf2018-06-30" unitRef="USD" xsi:nil="true" />
    <us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo contextRef="AsOf2018-06-30" unitRef="USD" xsi:nil="true" />
    <us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree contextRef="AsOf2018-06-30" unitRef="USD" decimals="0">4583333</us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree>
    <us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour contextRef="AsOf2018-06-30" unitRef="USD" decimals="0">5000000</us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour>
    <us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive contextRef="AsOf2018-06-30" unitRef="USD" decimals="0">416667</us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive>
    <us-gaap:DebtInstrumentCarryingAmount contextRef="AsOf2018-06-30" unitRef="USD" decimals="0">10000000</us-gaap:DebtInstrumentCarryingAmount>
    <us-gaap:DebtInstrumentUnamortizedDiscountPremiumNet contextRef="AsOf2018-06-30" unitRef="USD" decimals="0">777879</us-gaap:DebtInstrumentUnamortizedDiscountPremiumNet>
    <us-gaap:LongTermDebt contextRef="AsOf2018-06-30" unitRef="USD" decimals="0">9222121</us-gaap:LongTermDebt>
    <us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardDescription contextRef="From2018-01-01to2018-06-30">(i) the sale of ATM Shares under the ATM Agreement having an aggregate offering price of $25 million or (ii) the termination of the ATM Agreement by Cantor or the Company. The ATM Agreement may be terminated by Cantor or the Company at any time upon 10 days' notice to the other party, or by Cantor at any time in certain circumstances, including the occurrence of a material adverse change in the Company.</us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardDescription>
    <CLSN:PercentageOfOutstandingStockDeterminingFactorForIncentiveStockPrice contextRef="AsOf2018-06-30_custom_TwoThousandAndEighteenStockIncentivePlanMember" unitRef="Percentage" decimals="INF">0.10</CLSN:PercentageOfOutstandingStockDeterminingFactorForIncentiveStockPrice>
    <CLSN:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedForfeitureRate contextRef="From2018-01-01to2018-06-30" unitRef="Percentage" decimals="INF">0.00</CLSN:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedForfeitureRate>
    <CLSN:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedForfeitureRate contextRef="From2017-01-01to2017-06-30" unitRef="Percentage" decimals="INF">0.00</CLSN:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedForfeitureRate>
    <us-gaap:DeferredRevenue contextRef="AsOf2013-03-31" unitRef="USD" decimals="0">5000000</us-gaap:DeferredRevenue>
    <us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber contextRef="AsOf2018-06-30" unitRef="Shares" decimals="INF">3248516</us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber>
    <us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber contextRef="AsOf2017-12-31" unitRef="Shares" decimals="INF">3058402</us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber>
    <CLSN:WeightedAverageExercisePriceVested contextRef="AsOf2018-06-30" unitRef="USDPShares" decimals="INF">5.14</CLSN:WeightedAverageExercisePriceVested>
    <CLSN:WeightedAverageExercisePriceVested contextRef="AsOf2017-12-31" unitRef="USDPShares" decimals="INF">5.29</CLSN:WeightedAverageExercisePriceVested>
    <CLSN:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageExercisePrice contextRef="From2018-01-01to2018-06-30" unitRef="USDPShares" decimals="INF">2.63</CLSN:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageExercisePrice>
    <CLSN:ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsIntrinsicValueOutstanding contextRef="From2018-01-01to2018-06-30" unitRef="USD" decimals="0">119686</CLSN:ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsIntrinsicValueOutstanding>
    <CLSN:ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsRemainingContractualTerm contextRef="From2018-01-01to2018-06-30">P3Y5M27D</CLSN:ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsRemainingContractualTerm>
    <us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted contextRef="From2018-01-01to2018-06-30" unitRef="Shares" decimals="INF">190114</us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted>
    <us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss contextRef="AsOf2018-06-30" unitRef="USD" decimals="0">14910</us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss>
    <us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss contextRef="AsOf2017-12-31" unitRef="USD" decimals="0">10734</us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss>
    <CLSN:ScheduleOfWarrantActivityTableTextBlock contextRef="From2018-01-01to2018-06-30">&lt;p style="margin: 0pt"&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;Following is a summary of all warrant activity&#13;for the six months ended June 30, 2018:&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&amp;#160;&lt;/p&gt;&#13;&#13;&lt;table cellspacing="0" cellpadding="0" style="font: 12pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse"&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&lt;font style="font-size: 10pt"&gt;&lt;b&gt;Warrants&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt; text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid"&gt;&#13;        &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;Number of&lt;/b&gt;&lt;/p&gt;&#13;        &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;Warrants&lt;/b&gt;&lt;/p&gt;&#13;        &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;Issued&lt;/b&gt;&lt;/p&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt; text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt; text-align: center"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2" style="border-bottom: black 1.5pt solid"&gt;&#13;        &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;Weighted&lt;/b&gt;&lt;/p&gt;&#13;        &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;Average&lt;/b&gt;&lt;/p&gt;&#13;        &lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;Exercise Price&lt;/b&gt;&lt;/p&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt; text-align: center"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td colspan="2"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td style="width: 66%"&gt;&lt;font style="font-size: 10pt"&gt;Warrants outstanding at December 31, 2017&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 14%; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;3,058,402&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 14%; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;5.29&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="width: 1%"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&lt;font style="font-size: 10pt"&gt;Warrants issued during the six months ended June 30, 2018 (see Note 10)&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;190,114&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;2.63&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&lt;font style="font-size: 10pt"&gt;Warrants outstanding at June 30, 2018&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 2.25pt double; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;3,248,516&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;5.14&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 2.5pt"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&lt;font style="font-size: 10pt"&gt;Aggregate intrinsic value of outstanding warrants at June 30, 2018&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&lt;font style="font-size: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;119,686&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt; text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: #CCEEFF"&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="text-align: right"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&#13;&lt;tr style="vertical-align: bottom; background-color: white"&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&lt;font style="font-size: 10pt"&gt;Weighted average remaining contractual terms at June 30, 2018 (in years)&lt;/font&gt;&lt;/td&gt;&#13;    &lt;td style="padding-bottom: 1.5pt"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid"&gt;&amp;#160;&lt;/td&gt;&#13;    &lt;td style="border-bottom: black 1.5pt solid; text-align: right"&gt;&lt;font style="font-size: 10pt"&gt;3.49&lt;/font&gt;&lt;/td&gt;&#13; 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    <us-gaap:RepaymentsOfLinesOfCredit contextRef="From2013-11-11to2013-11-30_custom_HerculesCreditAgreementMember_custom_FirstTrancheMember" unitRef="USD" decimals="0">4000000</us-gaap:RepaymentsOfLinesOfCredit>
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    <us-gaap:StockIssuedDuringPeriodSharesReverseStockSplits contextRef="From2017-05-15to2017-05-16" unitRef="Shares" decimals="INF">4070172</us-gaap:StockIssuedDuringPeriodSharesReverseStockSplits>
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    <us-gaap:ShortTermInvestments contextRef="AsOf2018-06-30_us-gaap_CertificatesOfDepositMember" unitRef="USD" decimals="0">1714375</us-gaap:ShortTermInvestments>
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    <us-gaap:ShortTermInvestments contextRef="AsOf2018-06-30_us-gaap_CorporateDebtSecuritiesMember" unitRef="USD" decimals="0">11731979</us-gaap:ShortTermInvestments>
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    <CLSN:AvailableForSaleDebtSecuritiesAmortizedCostBasisCurrent contextRef="AsOf2018-06-30" unitRef="USD" decimals="0">13446354</CLSN:AvailableForSaleDebtSecuritiesAmortizedCostBasisCurrent>
    <CLSN:AvailableForSaleDebtSecuritiesAmortizedCostBasisCurrent contextRef="AsOf2017-12-31" unitRef="USD" decimals="0">12734184</CLSN:AvailableForSaleDebtSecuritiesAmortizedCostBasisCurrent>
    <CLSN:AggregateOfferingPriceRemainingAmounts contextRef="From2018-01-01to2018-01-31_custom_ATMAgreementMember" unitRef="USD" decimals="0">12200000</CLSN:AggregateOfferingPriceRemainingAmounts>
    <CLSN:NetAuthorizedAmountPercentage contextRef="From2018-01-01to2018-06-30" unitRef="Percentage" decimals="INF">0.90</CLSN:NetAuthorizedAmountPercentage>
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