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STOCKHOLDER'S EQUITY
6 Months Ended
Jun. 30, 2015
Stockholders Equity Note [Abstract]  
SHAREHOLDER'S EQUITY
9.
STOCKHOLDER’S EQUITY
 
On March 10, 2014, we completed a follow-on public offering of 1.6 million shares of our common stock at a public offering price of $31.00 per share (the “March 2014 Offering”). We received gross proceeds of $50.0 million, or net proceeds of $46.7 million after deducting costs of $3.3 million, including the underwriters’ fees and commissions, as well as expenses directly related to the March 2014 Offering . The number of shares sold in the March 2014 Offering includes the exercise in full by the underwriters of their option to purchase an additional 0.2 million shares of common stock.
 
Warrants to purchase 0.1 million shares of common stock expired unexercised during both the three and six months ended June 30, 2015. No warrants to purchase shares of common stock expired unexercised during the three and six months ended June 30, 2014. No warrants to purchase shares of common stock were exercised in the three and six months ended June 30, 2015. In January 2014, warrants to purchase an aggregate of 20 thousand shares of common stock were exercised at $9.00 per share.