Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Consolidated Statements of Comprehensive Income (Loss)
Net income (loss)	$ 2,494	$ (567)
Available-for-sale securities:
Unrealized gain (loss) on available-for-sale securities	11	201
Currency translation adjustments:
Change in currency translation adjustments	(30)	(48)
Total other comprehensive income (loss), net of tax	(19)	153
Total comprehensive income (loss)	$ 2,475	$ (414)