CONDENSED CONSOLIDATED STATEMENTS OF CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' (DEFICIT) EQUITY (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2020	Sep. 30, 2019
Underwriting discounts, offering costs and issuance costs	$ 17,003	$ 17,003
Series B-1 Convertible Preferred Stock
Underwriting discounts, offering costs and issuance costs			$ 49
Series B Convertible Preferred Stock
Underwriting discounts, offering costs and issuance costs		0
Series C Convertible Preferred Stock
Underwriting discounts, offering costs and issuance costs		$ 320