Stockholders' Equity

3 Months Ended

Mar. 31, 2015

Equity [Abstract]

Stockholders' Equity

6. STOCKHOLDERS’ EQUITY

Common Stock

As of March 31, 2015, the Company had reserved 2,418,119 shares of common stock for issuance upon the exercise of outstanding common stock options and vesting of restricted stock units. Also, 1,648,487 shares of the Company’s common stock were reserved for future grants of stock options (or other similar equity instruments) under the Company’s 2007 Stock Incentive Plan (the “2007 Plan”) as of March 31, 2015. In addition, 267,826 shares of the Company’s common stock were reserved for future exercise of outstanding warrants as of March 31, 2015.

On January 13, 2014, the Company completed a public offering of common stock in which a total of 3,047,500 shares were sold including 397,500 shares pursuant to the full exercise of the underwriter’s over-allotment option, at a price of $10.65 per share. The Company raised a total of $32.5 million in gross proceeds from the offering, or approximately $30.3 million in net proceeds after deducting the underwriting discount and expenses of $2.3 million.

On March 20, 2014, certain selling stockholders of the Company completed a public offering of 2,875,000 shares of common stock and the Company sold 375,000 shares pursuant to the full exercise of the underwriter’s over-allotment option each at a price of $13.00 per share. The Company raised a total of $4.9 million in gross proceeds from the offering, or approximately $4.4 million in net proceeds after deducting the underwriting discount and expenses of $319,000 and estimated costs of $148,000.

Warrants

For the three months ended March 31, 2015, no common stock warrants were exercised. At March 31, 2015 and December 31, 2014, there were 267,826 common stock warrants outstanding.