Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	6 Months Ended
	Jul. 31, 2015	Jun. 30, 2015	Aug. 01, 2015
Subsequent Event [Line Items]
Payment of offering costs		$ 27
Convertible preferred stock outstanding		31,397,000
Authorized common stock (in shares)		82,000,000
Common stock, par value (in dollars per share)		$ 0.0001
Deferred offering costs		$ 4,000
Subsequent Event
Subsequent Event [Line Items]
Convertible preferred stock outstanding	31,397,221		0
Authorized common stock (in shares)	750,000,000
Authorized preferred stock (in shares)	50,000,000
Common stock, par value (in dollars per share)	$ 0.0001
Preferred stock, par value (in dollars per share)	$ 0.0001
Subsequent Event | IPO | Common stock
Subsequent Event [Line Items]
Initial public offering (in shares)	10,900,000
Initial public offering price (dollars per share)	$ 18.00
Proceeds from initial public offering, net of offering costs	$ 178,500
Payment of offering costs	13,700
Accrued offering costs	$ 4,000