Convertible Preferred Stock - Schedule of Convertible Preferred Stock (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Series A Convertible Preferred Stock
Temporary Equity [Line Items]
Preferred Stock Authorized	0	2,172,524
Preferred Stock Issued and Outstanding		2,172,520
Liquidation Preference		$ 11,406
Carrying Value		$ 13,573
Common Stock Issuable Upon Conversion		2,172,520
Series B Convertible Preferred Stock
Temporary Equity [Line Items]
Preferred Stock Authorized	0	5,008,210
Preferred Stock Issued and Outstanding		4,999,976
Liquidation Preference		$ 44,625
Carrying Value		$ 44,738
Common Stock Issuable Upon Conversion		4,999,976