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Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ 49,798	$ 33,004	$ (155,945)	$ (130,657)
Other comprehensive income (loss):
Foreign currency translation adjustments	396	(2,038)	366	(3,372)
Available-for-sale investments:
Unrealized gain (loss) on investments, net of tax effect	13	(657)	(25)	(137)
Other comprehensive income (loss), net of taxes	409	(2,695)	341	(3,509)
Comprehensive income (loss)	$ 50,207	$ 30,309	$ (155,604)	$ (134,166)

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