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Convertible Preferred Stock and Stock Warrants	3 Months Ended
Convertible Preferred Stock and Stock Warrants	Mar. 31, 2015
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. On February 7, 2014, warrants were exercised to purchase 1,277,250 shares of the Company's common stock at $1.21 per share. The Company received cash proceeds of $1.5 million in connection with the warrants exercised. Following the exercise, the Company no longer has any outstanding warrants.