Unaudited Consolidated Statements of Redeemable Convertible Preferred Stock and Stockholders' Equity (Deficit) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2018	Mar. 31, 2018
Redeemable Convertible Preferred Stock | Series B redeemable convertible preferred stock
Redeemable convertible preferred stock issuance costs	$ 170	$ 170