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		$ (29,237)	$ (22,924)	$ (58,884)	$ (47,174)
Other comprehensive loss:
Foreign currency translation gains (losses)	[1]	1,091	1,547	(1,862)	(889)
Total other comprehensive income (loss)	[1]	1,091	1,547	(1,862)	(889)
Total comprehensive loss		$ (28,146)	$ (21,377)	$ (60,746)	$ (48,063)

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