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Common stock, treasury stock and warrants	9 Months Ended
Common stock, treasury stock and warrants	Sep. 30, 2017
Equity [Abstract]
Common stock, treasury stock and warrants	7. Common stock, treasury stock and warrants Common stock As of September 30, 2017 and December 31, 2016, the number of issued shares of common stock was 56,418,136 and 53,717,996, respectively, which included shares of treasury stock of 352,523 and 160,235, respectively. The change in the number of issued shares of common stock during the nine months ended September 30, 2017 was due to the issuance of an aggregate of 2,700,140 shares of common stock from the vesting of restricted stock units (“RSUs”) and the issuance of restricted stock, including 192,288 shares of common stock withheld to pay withholding taxes upon such vesting, which are reflected in treasury stock. Treasury stock As of September 30, 2017 and December 31, 2016, the Company held shares of treasury stock of 352,523 and 160,235, with a cost of $1,274 and $531, respectively. This increase in treasury stock during the nine months ended September 30, 2017 was due to shares withheld to pay withholding taxes upon the vesting of RSUs. Warrants As of September 30, 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.