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Condensed Consolidated Statements of Comprehensive Loss (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ 4,401	$ (33,459)	$ (59,773)	$ (115,844)
Other comprehensive income (loss), net of tax:
Reclassification of realized gain on available-for-sale securities recognized in interest income	(108)		(21)
Change in unrealized gain on marketable securities available- for-sale	(75)	(71)	30	105
Foreign currency translation adjustments	1,256	(1,034)	1,356	(1,178)
Total other comprehensive income (loss)	1,073	(1,105)	1,365	(1,073)
Total comprehensive income (loss)	$ 5,474	$ (34,564)	$ (58,408)	$ (116,917)

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