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Stockholders' Equity
 6 Months Ended
Jun. 30, 2016
Equity [Abstract]  
Stockholders' Equity
Stockholders’ Equity

Preferred Stock — The Company has authorized up to 5,000,000 shares of preferred stock, $0.0001 par value per share, for issuance. The preferred stock will have such rights, preferences, privileges and restrictions, including voting rights, dividend rights, conversion rights, redemption privileges and liquidation preferences, as shall be determined by the Company’s Board of Directors upon its issuance. To date, the Company has not issued any preferred shares.

Common Stock — The Company has authorized up to 275,000,000 shares of common stock, $0.0001 par value per share, for issuance. On July 14, 2016, shareholders approved a 75,000,000 share increase to the Company's authorized shares of common stock up to 350,000,000 shares.

November 2014 Purchase Agreement with Lincoln Park Capital, LLC - On November 18, 2014, the Company entered into a purchase agreement with Lincoln Park Capital, LLC (LPC), pursuant to which the Company has the right to sell to LPC up to $50 million in shares of the Company's common stock, subject to certain limitations and conditions over the 36 month term of the purchase agreement. Pursuant to the purchase agreement, LPC initially purchased 2.5 million shares of the Company's common stock at $2.00 per share and the Company issued 631,221 shares of common stock to LPC as a commitment fee, which was recorded as a cost of capital. As a result of this initial issuance, the Company received initial net proceeds of $4.9 million, after deducting commissions and other offering expenses. In addition to LPC’s initial purchase of our common stock under the purchase agreement, during the first quarter of 2015, we received net proceeds of $4.4 million from LPC’s subsequent purchases of a total of 2.7 million shares of our common stock, excluding the commitment fee shares. There were no sales of our common stock under the LPC purchase agreement during the six months ended June 30, 2016.

At Market Issuance Sales Agreements - On May 24, 2013 the Company entered into At Market Issuance Sales Agreements (ATM) with FBR & Co. (formerly MLV & Co. LLC) and Maxim Group LLC (the Agents). From time to time during the term of the ATM, we may issue and sell through the Agents, shares of our common stock, and the Agents collect a fee equal to 3% of the gross proceeds from the sale of shares, up to a total limit of $20 million in gross proceeds. The ATM is available to the Company until it is terminated by the Agents or the Company. During the first quarter of 2015, we received $2.3 million in net proceeds from the sale of 1.4 million shares of our common stock through the ATM. There were no sales of our common stock under the ATM during the six months ended June 30, 2016.
March 2015 Underwritten Public Offering - On March 18, 2015 the Company closed an underwritten public offering of 24,358,974 units at a price to the public of $1.56 per unit for gross proceeds of $38 million (the "March 2015 Offering"). Each unit consists of one share of common stock, and a warrant to purchase 0.50 of a share of common stock at an exercise price of $2.08 per share. The March 2015 Offering included an over-allotment option for the underwriters to purchase an additional 3,653,846 shares of common stock and/or warrants to purchase up to 1,826,923 shares of common stock. On March 18, 2015, the underwriters exercised their over-allotment option to purchase warrants to purchase an aggregate of 1,826,923 shares of common stock. On April 10, 2015, the underwriters exercised their over-allotment option to purchase 3,653,846 shares of common stock for additional net proceeds of $5.4 million. The total net proceeds of the March 2015 Offering, including the exercise of the over-allotment option to purchase the warrants, were $40.8 million, after deducting underwriting discounts and commissions and offering expenses payable by the Company.

January 2016 Underwritten Public Offering - On January 12, 2016 the Company closed an underwritten public offering of 19,772,727 units at a price to the public of $1.10 per unit for gross proceeds of $21.8 million (the "January 2016 Offering"). Each unit consists of one share of common stock, and a warrant to purchase 0.60 of a share of common stock at an exercise price of $1.42 per share. The January 2016 Offering included an over-allotment option for the underwriters to purchase an additional 2,965,909 shares of common stock and/or warrants to purchase up to 1,779,545 shares of common stock. On January 12, 2016, the underwriters exercised their over-allotment option to purchase warrants to purchase an aggregate of 1,779,545 shares of common stock. The underwriters did not exercise their over-allotment option to purchase 2,965,909 shares of our common stock. The total net proceeds of the January 2016 Offering, including the exercise of the over-allotment option to purchase the warrants, were $20.2 million, after deducting underwriting discounts and commissions and offering expense paid by the Company.

Shares of common stock for future issuance are reserved for as follows (in thousands):

 
As of June 30, 2016
Warrants outstanding
37,418

Stock options outstanding
10,309

Options reserved for future issuance under the Company’s 2007 Incentive Plan
10,923

Shares reserved for future issuance under the Employee Stock Purchase Plan
461

Total reserved for future issuance
59,111