CONSOLIDATED STATEMENTS OF CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS’ EQUITY (DEFICIT) (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
IPO \| Common Stock
Issuance costs		$ 7,600
Private Placement \| Common Stock
Issuance costs	$ 2,400
Series B convertible preferred stock
Issuance costs		$ 206