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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Comprehensive Income [Abstract]
Net loss	$ (6,568)	$ (10,355)	$ (23,406)	$ (40,385)
Other comprehensive income (loss), net of tax
Foreign currency translation adjustment, net of tax	22	30	226	(51)
Unrealized (loss) gain on available-for-sale securities, net of tax	(18)	(211)	(248)	251
Other comprehensive income (loss), net of tax	4	(181)	(22)	200
Comprehensive loss	$ (6,564)	$ (10,536)	$ (23,428)	$ (40,185)

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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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