Stockholders' Equity - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2015	Oct. 31, 2015
Class Of Stock [Line Items]
Accretion of redeemable convertible preferred stock to redemption value	$ 26	$ 88
Accretion of dividends on redeemable convertible preferred stock	$ 1,900	$ 4,530
Redeemable Convertible Preferred Stock
Class Of Stock [Line Items]
Redeemable convertible preferred stock, shares outstanding			62,235,313
Redeemable convertible preferred stock, par value			$ 0.0001
Series A Redeemable Convertible Preferred Stock
Class Of Stock [Line Items]
Redeemable convertible preferred stock, shares outstanding			38,500,000
Series A-1 Redeemable Convertible Preferred Stock
Class Of Stock [Line Items]
Redeemable convertible preferred stock, shares outstanding			6,666,667
Series B Redeemable Convertible Preferred Stock
Class Of Stock [Line Items]
Redeemable convertible preferred stock, shares outstanding			17,068,646