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CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement of Comprehensive Income [Abstract]
Net loss	$ (37,730)	$ (48,398)	$ (47,479)
Other comprehensive income (loss), net of tax
Foreign currency translation adjustment, net of income tax expense	266	(137)	13
Unrealized (loss) gain on available-for-sale securities, net of income tax expense	(784)	80	176
Other comprehensive (loss) income, net of tax	(518)	(57)	189
Comprehensive loss	$ (38,248)	$ (48,455)	$ (47,290)

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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