Statements of Redeemable Convertible Preferred Stock and Stockholders' Equity (Deficit) - Redeemable - USD ($) $ in Thousands	Redeemable Convertible Preferred Stock	Total
Balance at Dec. 31, 2014	$ 64,642
Balance (in shares) at Dec. 31, 2014	2,486,199
Increase (Decrease) in Redeemable Convertible Preferred Stock
Net loss	$ 0	$ (18,183)
Balance at Dec. 31, 2015	$ 64,642
Balance (in shares) at Dec. 31, 2015	2,486,199
Increase (Decrease) in Redeemable Convertible Preferred Stock
Conversion of redeemable convertible preferred stock to common stock	$ (64,642)	64,642
Conversion of redeemable convertible preferred stock to common stock (in shares)	(2,486,199)
Net loss		$ (16,708)
Balance at Dec. 31, 2016	$ 0
Balance (in shares) at Dec. 31, 2016	0