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Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 76,713	$ (75,240)	$ (152,600)
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 on marketable securities available-for-sale	(30)	(20)	140
Cumulative foreign currency translation adjustments	(2,509)	2,701	(512)
Total other comprehensive income (loss)	(2,539)	2,660	(372)
Total comprehensive loss	$ 74,174	$ (72,580)	$ (152,972)

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