The Company and Basis of Presentation (Details) (USD $) In Millions, except Share data, unless otherwise specified	0 Months Ended					0 Months Ended
	Jun. 11, 2013	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2014 Common stock	Jul. 02, 2013 Common stock Warrant	Jul. 11, 2013 Initial Public Offering	Jul. 02, 2013 Initial Public Offering	Jun. 11, 2013 Initial Public Offering	Jul. 02, 2013 Initial Public Offering Common stock	Jul. 02, 2013 Initial Public Offering Common stock Additional paid-in capital	Jul. 02, 2013 Initial Public Offering Convertible preferred stock Warrant liabilities	Jul. 11, 2013 Over-allotment option
Reverse Stock Split
Reverse stock split ratio of outstanding common stock	0.1431							0.1431
Par value of common stock (in dollars per share)	$ 0.001	$ 0.001	$ 0.001
Initial Public Offering
Original issue price (in dollars per share)							$ 14.00					$ 14.00
Net proceeds from the IPO, including proceeds from the exercise of the underwriters' over-allotment option						$ 72.2
Number of shares of convertible preferred stock converted into common stock									9,210,999
Warrants exercisable into common stock (in shares)				8,230	277,690
Reclassification of convertible preferred stock warrant liability to additional paid-in capital										$ 2.9	$ (2.9)