CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (unaudited) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement Of Income And Comprehensive Income [Abstract]
Net loss		$ (26,119)	$ (16,310)	$ (73,293)	$ (52,565)
Other comprehensive loss:
Foreign currency translation gains (losses)	[1]	3,140	(2,950)	2,251	(2,162)
Total other comprehensive income (loss)	[1]	3,140	(2,950)	2,251	(2,162)
Total comprehensive loss		$ (22,979)	$ (19,260)	$ (71,042)	$ (54,727)

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