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Stockholders' Equity
 6 Months Ended
Jun. 30, 2017
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 350,000,000 shares of common stock, $0.0001 par value per share, for issuance.

November 2014 Purchase Agreement with Lincoln Park Capital, LLC - On November 18, 2014, the Company entered into a purchase agreement (LPC 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 LPC Agreement. Pursuant to the purchase agreement, LPC initially purchased 125,000 shares of the Company's common stock at $40.00 per share and the Company issued 31,561 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. The Company did not sell any shares of our common stock under the LPC Agreement during the six months ended June 30, 2017. On February 6, 2017, the LPC Agreement was amended to decrease the total value of common stock that the Company may sell to LPC from $55,000,000 to $15,600,000. Except as noted below, the Company has $2.1 million of remaining availability under the LPC Agreement. Use of the purchase agreement with LPC is not currently available to the Company because the Company is not currently eligible to use a Form S-3 registration statement until April 2018 at the earliest.

At-The-Market Issuance Sales Agreements - On May 24, 2013, the Company entered into At-The-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. Except as noted below, the ATM is available to the Company until it is terminated by the Agents, or the Company. The Company did not sell any shares of our common stock under the ATM during the six months ended June 30, 2017. On December 4, 2015 we replenished the ATM limit up to $20 million in gross proceeds available for future sales of our common stock. Except as noted below, the Company has $19.1 million of remaining availability under the ATM. Use of the ATM is not currently available to the Company because the Company is not currently eligible to use a Form S-3 registration statement, and it does not expect to be eligible to use a Form S-3 registration statement until April 2018 at the earliest.

February 2017 Underwritten Public Offering - On February 13, 2017, the Company closed an underwritten public offering of 17,000,000 shares of common stock and warrants to purchase 17,000,000 shares of common stock priced at $1.00 per share and accompanying warrant (February 2017 Offering). The warrants are immediately exercisable with a strike price of $1.10 and will expire on the fifth anniversary of the date of issuance. The shares of common stock and the warrants were issued separately and were separately transferable immediately upon issuance. The net proceeds of the February 2017 Offering were $15.5 million, after deducting underwriting discounts and commissions and offering expenses paid by the Company. The fair value of the warrants to purchase shares of our common stock issued in connection with the February 2017 Offering was $10.4 million recorded as an issuance cost.

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

 
As of June 30, 2017
Warrants outstanding
19,557

Stock options outstanding
505

Options reserved for future issuance under the Company’s 2016 Incentive Plan
466

Shares reserved for future issuance under the Employee Stock Purchase Plan
17

Total reserved for future issuance
20,545