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		$ (22,903)	$ (26,119)	$ (81,787)	$ (73,293)
Other comprehensive loss:
Foreign currency translation gains (losses)	[1]	(1,708)	3,140	(3,570)	2,251
Total other comprehensive income (loss)	[1]	(1,708)	3,140	(3,570)	2,251
Total comprehensive loss		$ (24,611)	$ (22,979)	$ (85,357)	$ (71,042)

[1] Net of tax effect which was not material.