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Common stock, treasury stock and warrants
 3 Months Ended
Mar. 31, 2017
Equity [Abstract]  
Common stock, treasury stock and warrants

8. Common stock, treasury stock and warrants

Common stock

As of March 31, 2017 and December 31, 2016, the number of issued shares of common stock was 54,440,337 and 53,717,996, respectively, which included shares of treasury stock of 205,031 and 160,235, respectively.

The change in the number of issued shares of common stock during the three months ended March 31, 2017 was due to the issuance of an aggregate of 722,341 shares of common stock as a result of the vesting of restricted stock units (“RSUs”), of which, 44,796 shares of common stock were withheld to pay withholding taxes upon such vesting, which are reflected in treasury stock.

Treasury stock

As of March 31, 2017, the Company held 205,031 shares in treasury, with a cost of $699. This increase in treasury stock during the three months ended March 31, 2017 was due to shares that were withheld to pay withholding taxes upon the vesting of RSUs.

Warrants

As of March 31, 2017 and December 31, 2016, warrants to purchase an aggregate of 2,220,102 shares of common stock were outstanding, with exercise prices ranging from $3.75 to $10.00 per share.