CONDENSED CONSOLIDATED STATEMENTS OF COVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY (Parenthetical) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
2019 Public Offering
CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical)
Issuance of common stock, issuance costs			$ 1,102
2020 Public offering
CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical)
Issuance of common stock, issuance costs		$ 3,472
Lincoln Park Capital Registered Offering Purchase Agreement Offering Member
CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical)
Issuance of common stock, issuance costs	$ 10		$ 10