Consolidated 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	$ (65,801)	$ (80,893)	$ (78,254)
Other comprehensive income (loss):
Foreign currency translation adjustment	(1)	19	0
Unrealized (loss) gain on marketable securities	(30)	(59)	78
Total comprehensive loss	$ (65,832)	$ (80,933)	$ (78,176)