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Stockholders' Equity
 3 Months Ended
Mar. 31, 2016
Stockholders' Equity

Note 10. Stockholders’ Equity

Sales Agreement

On March 21, 2014, the Company entered into Amendment No. 1 to the Controlled Equity OfferingSM Sales Agreement, dated August 31, 2012 (as amended, the “Cantor Agreement”) with Cantor Fitzgerald & Co. (“Cantor”) that provided for the issuance and sale of shares of its common stock over the term of the Cantor Agreement having an aggregate offering price of up to $70 million through Cantor. Under the Cantor Agreement, Cantor also acts as the Company’s sales agent and receives compensation based on an aggregate of 2% of the gross proceeds on the sale price per share of its common stock. The issuance and sale of these shares by the Company pursuant to the Cantor Agreement are deemed an “at-the-market” offering and are registered under the Securities Act of 1933, as amended. During the three months ended March 31, 2016, 1.2 million shares of the Company’s common stock were sold under the Cantor Agreement for net proceeds of $7.1 million. At March 31, 2016, the Company had approximately $15.3 million of common stock available to be sold under the Cantor Agreement. See Note 15 regarding the amendment of the Cantor Agreement to increase the amount of common stock available to be sold thereunder.