Stockholders' Equity

6 Months Ended

Jun. 30, 2016

Stockholders' Equity

Stockholders' Equity

(10) Stockholders’ Equity

In March 2015, the Company issued 8,337,500 shares of its common stock in an underwritten public offering resulting in net proceeds to the Company of $188.8 million, after deducting underwriting fees and offering expenses.

In May 2016, the Company entered into an agreement with Cantor Fitzgerald & Co. to allow the Company to issue and sell shares of its common stock having an aggregate offering price of up to $60.0 million from time to time through Cantor, acting as agent.  Subject to the terms and conditions of the agreement, Cantor will sell shares from time to time based upon the Company’s instructions, including any price, time or size limits specified by the Company. Under the agreement, the Company pays Cantor a fixed commission rate of 3.0% of the gross sales price per share of any common stock sold through Cantor, as agent.  In June and July 2016, the Company issued 593,111 and 1,109,536 shares under the agreement and raised $2.7 million and $5.0 million in net proceeds, respectively.  At July 31, 2016, the Company had $52.0 million remaining in aggregate gross offering price available under the agreement.