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Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (75,240)	$ (152,600)	$ (158,899)
Other comprehensive income (loss), net of tax:
Reclassification of realized gain on available-for-sale securities recognized in interest income	(21)
Change in unrealized gain (loss) on marketable securities available-for-sale	(20)	140	12
Cumulative foreign currency translation adjustments	2,701	(512)	(1,146)
Total other comprehensive income (loss)	2,660	(372)	(1,134)
Total comprehensive loss	$ (72,580)	$ (152,972)	$ (160,033)

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