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CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement Of Income And Comprehensive Income [Abstract]
Net (loss) income	$ (7,524)	$ 34,355	$ 22,501
Other comprehensive income (loss), net of applicable taxes:
Foreign currency translation adjustment	5,913	(11)	(4,128)
Unrealized (loss) gain on short-term investments	(147)	577	(430)
Total other comprehensive income (loss)	5,766	566	(4,558)
Comprehensive (loss) income	$ (1,758)	$ 34,921	$ 17,943

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