Consolidated Statements of Redeemable Convertible Preferred Stock and Stockholders' Equity (Deficit) (Parenthetical) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($)
Redeemable Convertible Preferred Stock
Reclassification to redeemable convertible preferred stock tranche liability	$ 1,017
Series C redeemable convertible preferred stock
Redeemable Convertible Preferred Stock
Issuance of convertible redeemable preferred stock, issuance costs	138
Reclassification to redeemable convertible preferred stock tranche liability	$ 1,017