CONSOLIDATED STATEMENTS OF CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY (DEFICIT) (Parenthetical) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2015	Dec. 31, 2014
Issuance costs		$ 2,272
Temporary equity, issuance costs		$ 136	$ 60
Series B convertible preferred stock
Temporary equity, issuance costs	$ 60