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Condensed Consolidated Statements of Comprehensive Loss (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (71,755)	$ (78,348)
Other comprehensive income (loss):
Foreign currency translation adjustments	(70)	281
Available-for-sale investments:
Unrealized gain (loss) on investments, net of tax effect	(55)	1,649
Other comprehensive income, net of taxes	(125)	1,930
Comprehensive loss	$ (71,880)	$ (76,418)

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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