Stockholders' Equity

3 Months Ended

Mar. 31, 2016

Equity [Abstract]

Stockholders' Equity

6. STOCKHOLDERS’ EQUITY

Common Stock

As of March 31, 2016, the Company had reserved 3,183,945 shares of common stock for issuance upon the exercise of outstanding common stock options and vesting of restricted stock units. Also, 361,733 shares of the Company’s common stock were reserved for future grants of stock options and restricted stock units (or other similar equity instruments) under the Company’s 2007 Stock Incentive Plan (the “2007 Plan”) as of March 31, 2016.

Warrants

For the three months ended March 31, 2016, 24,380 warrants expired and the Company has no common stock warrants outstanding.