UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Comprehensive Income [Abstract]
Net (loss)	$ (56,468)	$ (19,267)	$ (25,794)	$ (65,379)
Other comprehensive (loss) income, net of tax
Unrealized gain (loss) on available-for-sale securities	53	(166)	1,184	(66)
Foreign currency translation adjustments	(4,400)	113	(3,669)	1,627
Total other comprehensive (loss) income, net of tax	(4,347)	(53)	(2,485)	1,561
Comprehensive (loss)	$ (60,815)	$ (19,320)	$ (28,279)	$ (63,818)