Subsequent Events	3 Months Ended
Mar. 31, 2017
Subsequent Events [Abstract]
Subsequent Events	12. Subsequent events On April 3, 2017, under the Company’s at the market offering program with JonesTrading, the Company sold an aggregate of 241,600 shares of its common stock for approximately $3.5 million of net proceeds. Following such sales, the Company has no more common stock available for sale under the program. On April 12, 2017, the Company issued and sold in a registered, underwritten public offering an aggregate of (i) 1,470,000 shares of common stock (including 540,000 shares of common stock sold pursuant to the exercise of the Underwriter’s overallotment option), (ii) 13,350 shares of Series A Preferred Stock, each convertible into 200 shares of common stock and (iii) warrants to purchase 2,070,000 shares of common stock at an exercise price of $5.50 per share (including 270,000 sold pursuant to the exercise of the Underwriter’s overallotment option). The net proceeds to the Company, after deducting the underwriting discounts and commissions and offering expenses payable by the Company was approximately $18.7 million. In connection with and following the Company’s underwritten public offering, certain holders of Series A Preferred Stock and warrants elected to convert or exercise such shares and warrants, respectively. In addition, subsequent to March 31, 2017, additional redeemable convertible notes were redeemed by the holders thereof. Accordingly, as of May 4, 2017, the Company had outstanding 4,260,561 shares of common stock, 5,750 shares of Series A Preferred Stock (convertible into an aggregate of 1,150,000 shares of common stock), warrants to purchase 2,041,075 shares of common stock at an exercise price of $5.50 per share, and options under the Company’s 2015 Stock Incentive Plan to purchase an aggregate of 44,670 shares of common stock at a weighted-average exercise price of $58.65 per share (in addition to other warrants to purchase an aggregate of 12,039 shares of common stock at a weighted-average exercise price of $145.11 per share, other options to purchase an aggregate of 80,619 shares of common stock at a weighted-average exercise price of $154.01 per share and $11.0 million of redeemable convertible promissory notes convertible at a rate of $137.85 per share).

12. Subsequent events

On April 3, 2017, under the Company’s at the market offering program with JonesTrading, the Company sold an aggregate of 241,600 shares of its common stock for approximately $3.5 million of net proceeds. Following such sales, the Company has no more common stock available for sale under the program.

On April 12, 2017, the Company issued and sold in a registered, underwritten public offering an aggregate of (i) 1,470,000 shares of common stock (including 540,000 shares of common stock sold pursuant to the exercise of the Underwriter’s overallotment option), (ii) 13,350 shares of Series A Preferred Stock, each convertible into 200 shares of common stock and (iii) warrants to purchase 2,070,000 shares of common stock at an exercise price of $5.50 per share (including 270,000 sold pursuant to the exercise of the Underwriter’s overallotment option). The net proceeds to the Company, after deducting the underwriting discounts and commissions and offering expenses payable by the Company was approximately $18.7 million.

In connection with and following the Company’s underwritten public offering, certain holders of Series A Preferred Stock and warrants elected to convert or exercise such shares and warrants, respectively. In addition, subsequent to March 31, 2017, additional redeemable convertible notes were redeemed by the holders thereof. Accordingly, as of May 4, 2017, the Company had outstanding 4,260,561 shares of common stock, 5,750 shares of Series A Preferred Stock (convertible into an aggregate of 1,150,000 shares of common stock), warrants to purchase 2,041,075 shares of common stock at an exercise price of $5.50 per share, and options under the Company’s 2015 Stock Incentive Plan to purchase an aggregate of 44,670 shares of common stock at a weighted-average exercise price of $58.65 per share (in addition to other warrants to purchase an aggregate of 12,039 shares of common stock at a weighted-average exercise price of $145.11 per share, other options to purchase an aggregate of 80,619 shares of common stock at a weighted-average exercise price of $154.01 per share and $11.0 million of redeemable convertible promissory notes convertible at a rate of $137.85 per share).