CONDENSED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (27,824)	$ (16,355)
Net unrealized loss on marketable securities	(43)	(256)
Comprehensive loss	$ (27,867)	$ (16,611)