Convertible Notes, Warrants, and Related Derivatives	6 Months Ended
Jun. 30, 2015
Debt Disclosure [Abstract]
Convertible Notes, Warrants, and Related Derivatives	Convertible Notes, Warrants, and Related Derivatives 2013 Convertible Notes, Common Stock Warrants, and Related Derivatives In February 2014, in connection with the Company’s IPO, the 2013 Notes with a principal amount of $23.7 million, accrued interest through the date of the IPO, remaining interest due through October 7, 2014, and derivative liability totaling $26.2 million converted into 1,637,846 shares of the Company’s common stock. In connection with the issuance of the 2013 Notes, the Company issued warrants to purchase 409,450 shares of common stock, which were net exercised for 405,594 shares of common stock upon the IPO. Additionally, the 2013 Notes had conversion and redemption features which were determined to be embedded derivatives, requiring bifurcation and separate fair value accounting. Immediately prior to the conversion, the Company determined that the fair value of the derivative liabilities associated with the convertible notes was reduced to $1.9 million, the value of interest due to note holders from the date of the IPO through the maturity date of the loan in October 2014. Upon the conversion of the 2013 Notes into shares of common stock, the Company applied extinguishment accounting resulting in a loss of $8.3 million. As of the date of conversion, the Company was in compliance with all covenants in the 2013 Notes. During the six months ended June 30, 2014, the Company recognized non-cash interest expense of $9.6 million related to the 2013 Notes, including amortization of warrant-related debt discount of approximately $0.4 million up to the date of conversion, amortization of the derivative-related debt discount of $0.6 million up to the date of conversion, accrued interest of $0.3 million up to the date of conversion and a loss on extinguishment of $8.3 million upon conversion of the 2013 Notes into common stock.

Convertible Notes, Warrants, and Related Derivatives

2013 Convertible Notes, Common Stock Warrants, and Related Derivatives

In February 2014, in connection with the Company’s IPO, the 2013 Notes with a principal amount of $23.7 million, accrued interest through the date of the IPO, remaining interest due through October 7, 2014, and derivative liability totaling $26.2 million converted into 1,637,846 shares of the Company’s common stock.

In connection with the issuance of the 2013 Notes, the Company issued warrants to purchase 409,450 shares of common stock, which were net exercised for 405,594 shares of common stock upon the IPO.

Additionally, the 2013 Notes had conversion and redemption features which were determined to be embedded derivatives, requiring bifurcation and separate fair value accounting. Immediately prior to the conversion, the Company determined that the fair value of the derivative liabilities associated with the convertible notes was reduced to $1.9 million, the value of interest due to note holders from the date of the IPO through the maturity date of the loan in October 2014.

Upon the conversion of the 2013 Notes into shares of common stock, the Company applied extinguishment accounting resulting in a loss of $8.3 million. As of the date of conversion, the Company was in compliance with all covenants in the 2013 Notes.

During the six months ended June 30, 2014, the Company recognized non-cash interest expense of $9.6 million related to the 2013 Notes, including amortization of warrant-related debt discount of approximately $0.4 million up to the date of conversion, amortization of the derivative-related debt discount of $0.6 million up to the date of conversion, accrued interest of $0.3 million up to the date of conversion and a loss on extinguishment of $8.3 million upon conversion of the 2013 Notes into common stock.