Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Consolidated Statements of Comprehensive Income (Loss)
Net income (loss)	$ 8,993	$ 580	$ 17,835	$ (8,290)
Other comprehensive income (loss), net of tax:
Unrealized gain (loss) on available-for-sale securities	(12)	(69)	(16)	(16)
Change in currency translation adjustments	(21)	9	(60)	(21)
Total other comprehensive income (loss), net of tax	(33)	(60)	(76)	(37)
Total comprehensive income (loss)	$ 8,960	$ 520	$ 17,759	$ (8,327)