STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (116,112)	$ (75,617)	$ (68,548)
Net unrealized (loss) gain on marketable securities	(251)	(54)	315
Comprehensive loss	$ (116,363)	$ (75,671)	$ (68,233)