Redeemable Convertible Preferred Stock	3 Months Ended
Mar. 31, 2017
Redeemable Convertible Preferred Stock [Abstract]
Redeemable Convertible Preferred Stock	6. Redeemable Convertible Preferred Stock On June 13, 2013, the Company’s Board of Directors approved a resolution designating 9,357,935 shares of Preferred Stock as Series B redeemable convertible preferred stock (Series B) with an initial stated value of $1.40 and par value of $0.01 per share. As of April 7, 2016, each Series B share was convertible into 0.02 shares of common stock and was entitled to the number of votes equal to the number of shares of common stock into which such Series B share could be converted. The Series B shares were convertible into common stock by the holder of the shares at any time. The Series B shares were subject to automatic conversion into common stock upon the election of the holders of at least two-thirds of the outstanding Series B shares. In addition, pursuant to the Company’s Articles of Incorporation, the Series B shares were automatically convertible into common stock upon the occurrence of an underwritten initial public offering by the Company that satisfied certain conditions. Holders of the Series B shares were entitled to receive cumulative, cash dividends at the rate of 10% of the Series B stated value. Such dividends accrued from day-to-day commencing on the original issue date, whether or not earned or declared by the Board of Directors, and were compounded annually. The Series B shares were redeemable by the Company at any time on or after June 26, 2018, upon the election of the holders of at least two-thirds of the outstanding Series B shares for an amount equal to the original issue price per share plus any accrued and unpaid dividends. Holders of the Series B shares were entitled to a liquidation preference in an amount equal to the Series B stated value of $1.40 per share plus all accrued and unpaid dividends in the event of a liquidation, dissolution, or winding-up of the Company, or in the event of a merger or acquisition of the Company. In connection with the private placement of Series B shares, the Company recorded a liability for an embedded derivative that required bifurcation under the applicable accounting guidance. The embedded derivative included a redemption feature, multiple dividend features, as well as multiple conversion features with specified anti-dilution adjustments for certain financing transactions involving the issuance of securities at a price below a minimum issuance price of $70.00 per share. From December 31, 2015 to April 7, 2016, the Company had accreted $1,858,000 from additional paid-in capital to Series B redeemable convertible preferred stock to adjust the redemption value of the Series B. On April 8, 2016, certain holders of over two-thirds of the Company’s then-outstanding shares of the Series B stock (the “Holders”) elected to automatically convert all outstanding shares of Series B into shares of common stock in accordance with Section 4.4.4(b)(ii) of the Company’s Amended and Restated Articles of Incorporation (the “Conversion”). As a result of the Conversion, the 7,527,853 shares of Series B outstanding as of immediately prior to the Conversion were converted into an aggregate of 150,556 shares of common stock. On April 8, 2016, the Company entered into the CSIA with the Holders pursuant to which the Company agreed to issue the Holders an aggregate of 85,346 shares of the Company’s common stock. Pursuant to the CSIA, the Company and the Holders also agreed to amend the common stock warrants previously issued to the Holders in June 2013 in order to reduce the exercise price of such warrants from $70.00 per share to $40.50 per share and extend the expiration date thereof from June 26, 2018 to March 31, 2021 (the “Warrant Amendments”). As consideration for the shares and the Warrant Amendments, the Holders waived their right to receive approximately $2.2 million in aggregate cash payments to which they were entitled upon the Conversion in respect of accrued dividends on their former shares of Series B. The Holders also waived their registration rights with respect to certain future registration statements that may be filed, and certain future public offerings that may be conducted, by the Company. The transaction was accounted for based on the difference between the fair value of the consideration transferred to the Holders of the preferred stock and the carrying amount of the preferred stock on April 7, 2016. The terms of the CSIA provide that if, after the date of the CSIA, the Company conducts one or more bona fide equity financings in which it sells shares of common stock or preferred stock at a price less than $40.50 per share (each, a “dilutive financing”), the Company will be required to issue to the Holders additional shares of common stock based on a specified formula until the obligation expires. The obligation to issue additional shares in the event of any such dilutive financing (i) only applies to the lowest priced financing conducted after the date of the CSIA, (ii) is subject to limitations under applicable NYSE MKT rules relating to the issuance of additional shares in a private placement at a price less than the greater of book or market value and (iii) will expire at such time the Company has raised $10.0 million in gross proceeds from the sale of common stock and/or preferred stock in a bona fide financing or financings or June 30, 2018, whichever occurs first. On June 3, 2016, the Company completed a registered public offering of shares of common stock and warrants at a combined per share purchase price of $23.50, resulting in aggregate gross proceeds of $5.0 million. On November 22, 2016, the Company completed an additional underwritten public offering of common stock and warrants at a combined per share purchase price of $7.50, for gross proceeds of approximately $4.0 million (see Note 8). These two offerings qualified as dilutive financings under the terms of the CSIA. On June 20, 2016, the Company obtained stockholder approval for the issuance of up to 103,705 shares of common stock to the Holders to the extent required by the terms of the CSIA in connection with one or more dilutive financings completed subsequent to the agreement date. Subsequent to the June and November 2016 financings and as of December 31, 2016, the maximum number of shares the Company could issue to the Holders pursuant to a future dilutive financing was 28,684 shares under the rules of the NYSE MKT. This maximum number of shares did not change during the three months ended March 31, 2017. The Company may be contractually required to issue additional shares for no consideration in excess of the maximum number of shares it is currently permitted to issue under the rules of the NYSE MKT. Prior to the completion of the Company's May 2017 public offering, the CSIA required the delivery of shares in the event of a future dilutive financing. The Company determined this was a conditional forward contract and recorded a derivative liability as of April 8, 2016 in the amount of $2.3 million for potential future dilutive financings. On June 3, 2016, the future financing derivative liability was adjusted by the fair value of the dilutive shares issuable of $1.5 million as a result of the June offering. In November 2016, the Company completed a registered public offering of common stock and warrants to purchase common stock at a price of $7.50 per share and accompanying warrant. In May 2017, the Company completed a public offering of common stock and warrants to purchase common stock, at a price of $1.49 per share of common stock and $0.01 per accompanying warrant. As a result of the November 2016 and May 2017 public offerings, the Holders may claim that we have an obligation to issue them, pursuant to the formula under the CSIA, in the aggregate, 552,169 shares of common stock: 222,407 shares as a result of the November 2016 public offering and 329,762 shares as a result of the May 2017 public offering. However, under section 713(a) of the NYSE MKT Company Guide, we are only permitted to issue 28,684 shares to the Holders without further stockholder approval. As of the date of this report, no shares of common stock have been issued to the Holders in connection with the November 2016 public offering or the May 2017 public offering. The dilutive financing derivative liability was marked-to-market at $123,000 as of March 31, 2017, with the decrease in fair value of $3,000 recorded as a component of change in fair value of derivative liabilities in the Company’s consolidated statements of operations (see Note 4) for the three months ended March 31, 2017. The March 31, 2017 consolidated balance sheet reflects dividends payable of $38,000 to former holders of preferred stock, which are classified as current liabilities.

6. Redeemable Convertible Preferred Stock

On June 13, 2013, the Company’s Board of Directors approved a resolution designating 9,357,935 shares of Preferred Stock as Series B redeemable convertible preferred stock (Series B) with an initial stated value of $1.40 and par value of $0.01 per share. As of April 7, 2016, each Series B share was convertible into 0.02 shares of common stock and was entitled to the number of votes equal to the number of shares of common stock into which such Series B share could be converted. The Series B shares were convertible into common stock by the holder of the shares at any time. The Series B shares were subject to automatic conversion into common stock upon the election of the holders of at least two-thirds of the outstanding Series B shares. In addition, pursuant to the Company’s Articles of Incorporation, the Series B shares were automatically convertible into common stock upon the occurrence of an underwritten initial public offering by the Company that satisfied certain conditions. Holders of the Series B shares were entitled to receive cumulative, cash dividends at the rate of 10% of the Series B stated value. Such dividends accrued from day-to-day commencing on the original issue date, whether or not earned or declared by the Board of Directors, and were compounded annually. The Series B shares were redeemable by the Company at any time on or after June 26, 2018, upon the election of the holders of at least two-thirds of the outstanding Series B shares for an amount equal to the original issue price per share plus any accrued and unpaid dividends. Holders of the Series B shares were entitled to a liquidation preference in an amount equal to the Series B stated value of $1.40 per share plus all accrued and unpaid dividends in the event of a liquidation, dissolution, or winding-up of the Company, or in the event of a merger or acquisition of the Company. In connection with the private placement of Series B shares, the Company recorded a liability for an embedded derivative that required bifurcation under the applicable accounting guidance. The embedded derivative included a redemption feature, multiple dividend features, as well as multiple conversion features with specified anti-dilution adjustments for certain financing transactions involving the issuance of securities at a price below a minimum issuance price of $70.00 per share.

From December 31, 2015 to April 7, 2016, the Company had accreted $1,858,000 from additional paid-in capital to Series B redeemable convertible preferred stock to adjust the redemption value of the Series B.

On April 8, 2016, certain holders of over two-thirds of the Company’s then-outstanding shares of the Series B stock (the “Holders”) elected to automatically convert all outstanding shares of Series B into shares of common stock in accordance with Section 4.4.4(b)(ii) of the Company’s Amended and Restated Articles of Incorporation (the “Conversion”). As a result of the Conversion, the 7,527,853 shares of Series B outstanding as of immediately prior to the Conversion were converted into an aggregate of 150,556 shares of common stock.

On April 8, 2016, the Company entered into the CSIA with the Holders pursuant to which the Company agreed to issue the Holders an aggregate of 85,346 shares of the Company’s common stock. Pursuant to the CSIA, the Company and the Holders also agreed to amend the common stock warrants previously issued to the Holders in June 2013 in order to reduce the exercise price of such warrants from $70.00 per share to $40.50 per share and extend the expiration date thereof from June 26, 2018 to March 31, 2021 (the “Warrant Amendments”). As consideration for the shares and the Warrant Amendments, the Holders waived their right to receive approximately $2.2 million in aggregate cash payments to which they were entitled upon the Conversion in respect of accrued dividends on their former shares of Series B. The Holders also waived their registration rights with respect to certain future registration statements that may be filed, and certain future public offerings that may be conducted, by the Company. The transaction was accounted for based on the difference between the fair value of the consideration transferred to the Holders of the preferred stock and the carrying amount of the preferred stock on April 7, 2016.

The terms of the CSIA provide that if, after the date of the CSIA, the Company conducts one or more bona fide equity financings in which it sells shares of common stock or preferred stock at a price less than $40.50 per share (each, a “dilutive financing”), the Company will be required to issue to the Holders additional shares of common stock based on a specified formula until the obligation expires. The obligation to issue additional shares in the event of any such dilutive financing (i) only applies to the lowest priced financing conducted after the date of the CSIA, (ii) is subject to limitations under applicable NYSE MKT rules relating to the issuance of additional shares in a private placement at a price less than the greater of book or market value and (iii) will expire at such time the Company has raised $10.0 million in gross proceeds from the sale of common stock and/or preferred stock in a bona fide financing or financings or June 30, 2018, whichever occurs first.

On June 3, 2016, the Company completed a registered public offering of shares of common stock and warrants at a combined per share purchase price of $23.50, resulting in aggregate gross proceeds of $5.0 million. On November 22, 2016, the Company completed an additional underwritten public offering of common stock and warrants at a combined per share purchase price of $7.50, for gross proceeds of approximately $4.0 million (see Note 8). These two offerings qualified as dilutive financings under the terms of the CSIA.

On June 20, 2016, the Company obtained stockholder approval for the issuance of up to 103,705 shares of common stock to the Holders to the extent required by the terms of the CSIA in connection with one or more dilutive financings completed subsequent to the agreement date. Subsequent to the June and November 2016 financings and as of December 31, 2016, the maximum number of shares the Company could issue to the Holders pursuant to a future dilutive financing was 28,684 shares under the rules of the NYSE MKT. This maximum number of shares did not change during the three months ended March 31, 2017. The Company may be contractually required to issue additional shares for no consideration in excess of the maximum number of shares it is currently permitted to issue under the rules of the NYSE MKT.

Prior to the completion of the Company's May 2017 public offering, the CSIA required the delivery of shares in the event of a future dilutive financing. The Company determined this was a conditional forward contract and recorded a derivative liability as of April 8, 2016 in the amount of $2.3 million for potential future dilutive financings. On June 3, 2016, the future financing derivative liability was adjusted by the fair value of the dilutive shares issuable of $1.5 million as a result of the June offering. In November 2016, the Company completed a registered public offering of common stock and warrants to purchase common stock at a price of $7.50 per share and accompanying warrant. In May 2017, the Company completed a public offering of common stock and warrants to purchase common stock, at a price of $1.49 per share of common stock and $0.01 per accompanying warrant. As a result of the November 2016 and May 2017 public offerings, the Holders may claim that we have an obligation to issue them, pursuant to the formula under the CSIA, in the aggregate, 552,169 shares of common stock: 222,407 shares as a result of the November 2016 public offering and 329,762 shares as a result of the May 2017 public offering. However, under section 713(a) of the NYSE MKT Company Guide, we are only permitted to issue 28,684 shares to the Holders without further stockholder approval. As of the date of this report, no shares of common stock have been issued to the Holders in connection with the November 2016 public offering or the May 2017 public offering.

The dilutive financing derivative liability was marked-to-market at $123,000 as of March 31, 2017, with the decrease in fair value of $3,000 recorded as a component of change in fair value of derivative liabilities in the Company’s consolidated statements of operations (see Note 4) for the three months ended March 31, 2017.

The March 31, 2017 consolidated balance sheet reflects dividends payable of $38,000 to former holders of preferred stock, which are classified as current liabilities.