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Stockholders' Equity	6 Months Ended
	Jun. 30, 2020
Stockholders Equity Note [Abstract]
Stockholders' Equity	11. Stockholders’ Equity Preferred Stock The Company has authorized 5,000,000 shares of preferred stock, par value $0.001 per share. The Company’s Board of Directors is authorized to designate the terms and conditions of any preferred stock the Company issues without further action by the common stockholders.  There were no shares of Series A 3.6% Convertible Preferred Stock outstanding as of June 30, 2020 or December 31, 2019. There were 1,021 shares of Series B Convertible Preferred Stock outstanding as of each of June 30, 2020 and December 31, 2019. There were 938 shares of Series C Preferred Stock outstanding as of June 30, 2020 and December 31, 2019. As of June 30, 2020, there were 938 outstanding shares of Series C Preferred Stock that can be converted into an aggregate of 291,920 shares of common stock, and 1,021 shares of Series B Convertible Preferred Stock that can be converted into an aggregate of 6,133 shares of common stock.  In April 2020, in connection with the Warrant Amendments (defined below), the conversion price of the Series C Preferred Stock was reduced from $3.2132 per share to $2.25 per share. Warrants Pursuant to a registration statement on Form S-1 originally filed on April 27, 2018, as amended, which became effective on July 17, 2018, and related prospectus (as supplemented), the Company registered and distributed to holders of its common stock and Series B Convertible Preferred Stock, at no charge, non-transferable subscription rights to purchase up to an aggregate of 20,000 units for $1,000 a unit. Each such unit consisted of one share of Series C Preferred Stock and 1,050 warrants (“Series T Warrants”). Pursuant to the 2018 Rights Offering, which closed on July 25, 2018, the Company sold an aggregate of 6,723 units, resulting in total net proceeds to the Company of approximately $5.7 million. In April 2020, in connection with Warrant Amendments (defined below), the exercise price of the Series T Warrants was further adjusted such that every 50 warrants can be exercised into one share of common stock for $2.25. As of June 30, 2020, there were 3,788,400 outstanding Series T Warrants that can be exercised into an aggregate of 75,768 shares of common stock. On September 25, 2019, the Company completed an underwritten public offering. The Company issued 289,000 shares of its common stock, along with pre-funded warrants to purchase 2,711,000 shares of its common stock and Series U Warrants to purchase 3,450,000 shares of its common stock at $5.00 per share. The Series U Warrants have a term of five years from the issuance date. In addition, the Company issued warrants to H.C. Wainwright & Co., LLC, as representatives of the underwriters, to purchase 75,000 shares of its common stock at $6.25 per share with a term of 5.0 years from the issuance date, in the form of Series U Warrants (the “Representative Warrants”). In accordance with authoritative guidance, the pre-funded warrants are classified as equity. The Series U Warrants and the Representative Warrants are classified as liabilities due to a contingent obligation for the Company to settle the Series U Warrants with cash upon certain change in control events. Between April and June 2020, the Company entered into revised warrant agreements with the holders of 3,415,000 Series U Warrants (“Warrant Amendments”). In return for reducing the strike price of the warrants to $2.25 per share, the warrant holders agreed to amend the settlement provisions upon fundamental transactions such that the warrants would meet the requirements to be classified within stockholders’ equity. Accordingly, approximately $4.3 million of warrant liability was reclassified to the stockholders’ equity section of the balance sheet on the respective effective date of the Warrant Amendment. In addition, approximately $0.8 million of other income representing change in the fair value of amended warrants from April 1, 2020 to the respective effective date of the Warrant Amendments is recorded in the consolidated condensed statement of operations and comprehensive loss for the three months ended June 30, 2020. As of June 30, 2020, there were 3,362,500 outstanding Series U Warrants which can be exercised into an aggregate of 3,362,500 shares of common stock. Common Stock On September 21, 2018, the Company entered into the Lincoln Park Purchase Agreement with Lincoln Park pursuant to which the Company has the right to sell to Lincoln Park and Lincoln Park is obligated to purchase up to $5.0 million of shares of the Company’s common stock over the 24-month period following October 15, 2018. Through December 31, 2018, the Company sold a total of 12,802 shares for proceeds of approximately $0.3 million through the Lincoln Park Purchase Agreement. During the year ended December 31, 2019, the Company sold a total of 32,170 shares for proceeds of approximately $0.3 million. The Company believes there is no amount remaining available under this financing facility as of June 30, 2020.

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- Definition

The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-URI http://asc.fasb.org/topic&trid=2208762

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