CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (unaudited) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement Of Income And Comprehensive Income [Abstract]
Net loss		$ (22,924)	$ (18,478)	$ (47,174)	$ (36,255)
Other comprehensive loss:
Foreign currency translation gains (losses)	[1]	1,547	807	(889)	788
Total other comprehensive income (loss)	[1]	1,547	807	(889)	788
Total comprehensive loss		$ (21,377)	$ (17,671)	$ (48,063)	$ (35,467)

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