Stockholders' Equity	6 Months Ended
Jun. 30, 2017
Consolidated Statements of Stockholders' Equity
Stockholders' Equity	9. Stockholders’ Equity Exercise of Common Stock Warrants On December 22, 2016, the Company issued 10,501,500 warrants in connection with offerings of common stock and Series D Redeemable Preferred Stock at an exercise price of $1.50 per share. On April 12, 2017, the Company and Tech Opportunities LLC (“Tech Opps”) entered into an agreement, pursuant to which Tech Opps exercised in full its warrants to purchase an aggregate of 10,501,500 shares of common stock, at an exercise price of $1.50 per share. The net proceeds received by the Company pursuant to the exercise of the existing warrants was $15.1 million and the Company issued to Tech Opps warrants to acquire up to 5,250,750 shares of common stock at an exercise price of $2.69 per share. The warrants will be exercisable beginning on October 12, 2017 and will expire on October 12, 2019. The warrants are subject to anti-dilution provisions in the event of issuance of additional shares of common stock and certain other conditions, as further described in the warrant agreement. During April 2017, the 4,000,000 warrants issued in January 2014 as part of an underwritten public offering with Heights Capital Management Inc., were exercised in full to purchase an aggregate of 4,000,000 shares of the Company’s common stock, at an exercise price of $0.65 per share. The aggregate cash exercise price paid to the Company pursuant to the exercise of the warrants was $2.6 million. Pursuant to the exercises of the above warrants, additional paid-in capital was increased $27.1 million and warrant liability reduced by $27.1 million. At Market Issuance Sales Agreement On April 3, 2017, the Company entered into an At Market Issuance Sales Agreement (the “Sales Agreement”) with FBR Capital Markets & Co., as sales agent (“FBR”), pursuant to which the Company may offer and sell, from time to time through FBR, shares of common stock par value $0.01 per share having an aggregate offering price of up to $75.0 million. During 2017, the Company has issued 9,314,666 shares of common stock and raised net proceeds, after accruals, underwriting discounts and commissions and other fees and expenses, of $20.7 million, pursuant to the Sales Agreement.

9. Stockholders’ Equity

Exercise of Common Stock Warrants

On December 22, 2016, the Company issued 10,501,500 warrants in connection with offerings of common stock and Series D Redeemable Preferred Stock at an exercise price of $1.50 per share. On April 12, 2017, the Company and Tech Opportunities LLC (“Tech Opps”) entered into an agreement, pursuant to which Tech Opps exercised in full its warrants to purchase an aggregate of 10,501,500 shares of common stock, at an exercise price of $1.50 per share. The net proceeds received by the Company pursuant to the exercise of the existing warrants was $15.1 million and the Company issued to Tech Opps warrants to acquire up to 5,250,750 shares of common stock at an exercise price of $2.69 per share. The warrants will be exercisable beginning on October 12, 2017 and will expire on October 12, 2019. The warrants are subject to anti-dilution provisions in the event of issuance of additional shares of common stock and certain other conditions, as further described in the warrant agreement.

During April 2017, the 4,000,000 warrants issued in January 2014 as part of an underwritten public offering with Heights Capital Management Inc., were exercised in full to purchase an aggregate of 4,000,000 shares of the Company’s common stock, at an exercise price of $0.65 per share. The aggregate cash exercise price paid to the Company pursuant to the exercise of the warrants was $2.6 million.

Pursuant to the exercises of the above warrants, additional paid-in capital was increased $27.1 million and warrant liability reduced by $27.1 million.

At Market Issuance Sales Agreement

On April 3, 2017, the Company entered into an At Market Issuance Sales Agreement (the “Sales Agreement”) with FBR Capital Markets & Co., as sales agent (“FBR”), pursuant to which the Company may offer and sell, from time to time through FBR, shares of common stock par value $0.01 per share having an aggregate offering price of up to $75.0 million. During 2017, the Company has issued 9,314,666 shares of common stock and raised net proceeds, after accruals, underwriting discounts and commissions and other fees and expenses, of $20.7 million, pursuant to the Sales Agreement.