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CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME
Net (loss) income	$ (49,593)	$ (120,348)	$ 15,424
Other comprehensive (loss) income
Foreign currency translation gain (loss)	781	(691)	(65)
Unrealized (loss) gain on short-term investments	(1,770)	365	657
Other comprehensive (loss) income	(989)	(326)	592
Total comprehensive (loss) income	$ (50,582)	$ (120,674)	$ 16,016

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