CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (38,205)	$ (15,805)	$ (61,108)	$ (36,527)
Foreign currency translation adjustments	1,697	6	(1,355)	75
Comprehensive loss	$ (36,508)	$ (15,799)	$ (62,463)	$ (36,452)