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Common stock, treasury stock and warrants	3 Months Ended
	Mar. 31, 2018
Equity [Abstract]
Common stock, treasury stock and warrants	8. Common stock, treasury stock and warrants Common stock As of March 31, 2018 and December 31, 2017, the number of issued shares of common stock was 76,437,209 and 61,631,573, respectively, which included shares of treasury stock of 495,918 and 352,523, respectively. The change in the number of issued shares of common stock during the three months ended March 31, 2018 was a result of the following issuances: • An aggregate of 12,105,636 shares of common stock were issued as a result of the vesting of RSUs, including 143,395 shares of common stock withheld to pay withholding taxes upon such vesting, which are reflected in treasury stock. • An aggregate of 2,700,000 shares of common stock were issued in a registered direct offering (“Registered Direct Offering”) to certain investors with a purchase price of $5.00 per share, pursuant to a definitive securities purchase agreement entered into on January 10, 2018, for net proceeds of $13,392, net of issuance costs of $108. Simultaneously, the Company issued such institutional buyers, for no additional consideration, warrants to purchase an aggregate of 1,350,000 shares of common stock. The warrants have an exercise price of $6.00 per share and are exercisable from the date of issuance, with a two-year exercise period. Treasury stock As of March 31, 2018 and December 31, 2017, the Company held shares of treasury stock of 495,918 and 352,523, with a cost of $1,672 and $1,274, respectively. This increase in treasury stock during the three months ended March 31, 2018 was due to shares withheld to pay withholding taxes upon the vesting of RSUs. Warrants As of March 31, 2018 and December 31, 2017, warrants to purchase an aggregate of 2,623,776 shares and 1,273,776 shares of common stock were outstanding, respectively, with exercise prices ranging from $3.75 to $8.00 per share. The increase in warrants was a result of the issuance of warrants to purchase an aggregate of 1,350,000 shares of common stock, with an exercise price of $6.00 per share, concurrent with the Registered Direct Offering, as discussed above.

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- Definition

The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-URI http://asc.fasb.org/topic&trid=2208762

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