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Convertible Preferred Stock and Stock Warrants	12 Months Ended
Convertible Preferred Stock and Stock Warrants	Dec. 31, 2016
Warrants and Rights Note Disclosure [Abstract]
Convertible Preferred Stock and Stock Warrants	Convertible Preferred Stock and Stock Warrants In August 2009, the Company sold convertible preferred stock with detachable warrants to purchase shares of the Company’s common stock. In February 2011, the Company exercised its contractual right to mandatorily convert all outstanding shares of convertible preferred stock into shares of common stock. Currently, the Company has no issued or outstanding shares of preferred stock. During the year ended December 31, 2014, warrants were exercised to purchase 1,277,250 shares of the Company’s common stock at $1.21 per share generating cash proceeds of $1.5 million. The Company no longer has any outstanding warrants.