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Warrants | 12 Months Ended
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Dec. 31, 2017
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Warrants | 15. Warrants Contemporaneous with the financing transaction in 2011 described in Note 14, the Company issued certain management stockholders warrants to purchase 4,000 shares of common stock for a purchase price of $0.0045 per share. The warrants were exercisable upon the achievement of certain triggering events, as defined in the warrant agreements. On December 2, 2016, a triggering event, as defined in the warrant agreement, had been achieved and all warrants were fully exercised.

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