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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 income (loss)	$ 891	$ (12,595)
Other comprehensive income (loss), net of tax:
Change in unrealized gain on marketable securities available- for-sale	(9)	291
Foreign currency translation adjustments	(1,390)	(479)
Total other comprehensive loss	(1,399)	(188)
Total comprehensive loss	$ (508)	$ (12,783)

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