CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (43,031)	$ (15,669)	$ (104,139)	$ (52,196)
Foreign currency translation adjustments	(3,463)	18	(4,818)	93
Comprehensive loss	$ (46,494)	$ (15,651)	$ (108,957)	$ (52,103)