Stockholders' Deficit - Schedule of Outstanding Redeemable Convertible Preferred Stock (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Oct. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Series A Redeemable Convertible Preferred Stock
Class Of Stock [Line Items]
Shares Authorized			38,500,000	38,500,000
Shares Issued				38,250,000
Shares Outstanding				38,250,000	19,250,000
Liquidation Value				$ 42,006
Carrying Value				$ 41,359	$ 19,388
Series A-1 Redeemable Convertible Preferred Stock
Class Of Stock [Line Items]
Shares Authorized			6,666,667	6,666,667
Shares Issued				6,666,667
Shares Outstanding				6,666,667
Liquidation Value				$ 10,327
Carrying Value				$ 10,229
Redeemable Convertible Preferred Stock
Class Of Stock [Line Items]
Shares Authorized			62,235,313	45,166,667
Shares Issued				44,916,667
Shares Outstanding	0	0		44,916,667
Liquidation Value				$ 52,333
Carrying Value				$ 51,588