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Condensed Consolidated Statements of Comprehensive Loss (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ 4,473	$ (51,579)	$ 5,364	$ (64,174)
Other comprehensive income (loss), net of tax:
Change in unrealized gain (loss) on marketable securities available- for-sale	38	(99)	29	192
Foreign currency translation adjustments	375	579	(1,015)	100
Total other comprehensive income (loss)	413	480	(986)	292
Total comprehensive income (loss)	$ 4,886	$ (51,099)	$ 4,378	$ (63,882)

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