Subsequent Events (Details) (USD $) In Millions, except Share data, unless otherwise specified		0 Months Ended
	Sep. 30, 2013	Nov. 04, 2013 Subsequent Events	Oct. 09, 2013 Subsequent Events	Nov. 04, 2013 Subsequent Events Maximum item
Subsequent Events
Number of shares issued and sold in IPO		5,000,000
Issuance price per share in IPO (in dollars per share)	$ 12.12	$ 13.00
Net proceeds from issuance of common stock in IPO		$ 57.9
Underwriting discounts and commissions		4.6
Estimated offering expenses		$ 2.5
Convertible preferred stock converted to common stock (in shares)		59,989,268
Common stock issued on automatic conversion of outstanding convertible preferred stock (in shares)		14,997,312
Preferred stock warrants converted (in shares)		99,206
Warrants issued to purchase common stock upon conversion of preferred stock warrants (in shares)		24,801
Reverse stock split ratio			4
Common stock issued upon conversion of each preferred stock (in shares)			0.25
Number of shares of preferred stock authorized		5,000,000
Preferred stock, par value (in dollars per share)		$ 0.001
Number of series in which preferred stock may be issued				1