Notes Payable	12 Months Ended
Dec. 31, 2014
Debt Disclosure [Abstract]
Notes Payable	Notes Payable In the quarter ended March 31, 2013, the Company issued in a private placement an aggregate of $6,750 of unsecured notes with an annual interest rate of 10%. The notes had a stated maturity of January 2016 and were subject to mandatory prepayment in the event the Company completed a qualifying initial public offering. As such, the Company repaid the notes in June 2013 in connection with the closing of the IPO, including accrued interest of $252 through the IPO date. In connection with the issuance of the notes, the Company issued to the purchasers of the notes detachable warrants to purchase an aggregate of 86 shares of common stock with an exercise price equal to the greater of $13.92 and 90% of the price at which shares of common stock were offered to the public in a qualifying initial public offering. The warrants, which expire in January 2018 became exercisable 180 days after the closing of the IPO. The Company recorded the fair value of the warrants, calculated using the Black-Scholes model, as a discount to the notes. Since the exercise price was not fixed upon the issuance of the warrants, the fair value of the warrants of $454 was initially classified as an other long-term liability. As a result of the completion of the IPO, the exercise price became fixed and the fair value of the warrants of $435 was reclassified to additional paid-in capital. The unamortized debt discount of $405 was recognized as interest expense upon repayment of the notes.

Notes Payable

12 Months Ended

Dec. 31, 2014

In the quarter ended March 31, 2013, the Company issued in a private placement an aggregate of $6,750 of unsecured notes with an annual interest rate of 10%. The notes had a stated maturity of January 2016 and were subject to mandatory prepayment in the event the Company completed a qualifying initial public offering. As such, the Company repaid the notes in June 2013 in connection with the closing of the IPO, including accrued interest of $252 through the IPO date.

In connection with the issuance of the notes, the Company issued to the purchasers of the notes detachable warrants to purchase an aggregate of 86 shares of common stock with an exercise price equal to the greater of $13.92 and 90% of the price at which shares of common stock were offered to the public in a qualifying initial public offering. The warrants, which expire in January 2018 became exercisable 180 days after the closing of the IPO. The Company recorded the fair value of the warrants, calculated using the Black-Scholes model, as a discount to the notes. Since the exercise price was not fixed upon the issuance of the warrants, the fair value of the warrants of $454 was initially classified as an other long-term liability. As a result of the completion of the IPO, the exercise price became fixed and the fair value of the warrants of $435 was reclassified to additional paid-in capital. The unamortized debt discount of $405 was recognized as interest expense upon repayment of the notes.