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Preferred Stock Warrants	12 Months Ended
Preferred Stock Warrants	Dec. 31, 2016
Equity [Abstract]
Preferred Stock Warrants	13. Preferred Stock Warrants The Company had 19,675 Series A preferred stock warrants and 56,839 Series B redeemable convertible preferred stock warrants outstanding as of December 31, 2013 with an exercise price of $6.10 per share. All of these warrants were issued in connection with the Comerica loan agreements described in Note 7. The warrants were converted to warrants to purchase common stock in November 2014. See Note 4. The fair value of warrants to purchase convertible preferred stock was determined using the Black-Scholes option pricing model.