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Stockholders' Equity
 3 Months Ended
Mar. 31, 2017
Equity [Abstract]  
Stockholders' Equity

NOTE 8. STOCKHOLDERS’ EQUITY

Option Exercises

For the three months ended March 31, 2017, employees exercised options to purchase 19,301 shares of the Company’s common stock with insignificant net proceeds to the Company. For the three months ended March 31, 2016, employees exercised options to purchase 6,250 shares of the Company’s common stock with insignificant net proceeds to the Company.

Restricted Stock Units

For the three months ended March 31, 2017, the Company issued 15,188 shares of the Company’s common stock due to vesting of restricted stock units. For the three ended March 31, 2016, the Company issued zero shares of the Company’s common stock due to vesting of restricted stock units.

Employee Stock Purchase Plan

In February 2017, the Company sold 42,845 shares under the ESPP. The shares were purchased at a purchase price of $8.77 per share with proceeds to the Company of approximately $0.4 million.

Offerings of Common Stock and Warrants

In June 2015, the Company sold and issued an aggregate of 7,242,992 shares of its common stock and warrants to purchase 2,172,899 shares of common stock in a private placement transaction for aggregate gross proceeds of approximately $77.8 million or net proceeds, after deducting issuance costs, of approximately $74.3 million. The purchase price for the common stock was $10.70 per share and the purchase price for the warrants was $0.125 per warrant. The warrants are exercisable for an exercise price of $13.91 per share. None of the warrants issued in June 2015 have been exercised as of March 31, 2017.