Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Consolidated Statements of Comprehensive Income (Loss)
Net income (loss)	$ 6,348	$ (8,302)	$ 8,842	$ (8,869)
Other comprehensive income (loss), net of tax:
Unrealized gain (loss) on available-for-sale securities	(15)	(148)	(4)	53
Change in currency translation adjustments	(9)	18	(39)	(30)
Total other comprehensive income (loss), net of tax	(24)	(130)	(43)	23
Total comprehensive income (loss)	$ 6,324	$ (8,432)	$ 8,799	$ (8,846)