CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 1,799	$ (353)	$ 4,276	$ 606
Other comprehensive income (loss) before income taxes:
Foreign currency translation adjustments	236	(269)	(210)	(199)
Unrealized gains (losses) on available-for-sale securities:
Unrealized gains (losses) on available-for-sale securities	(58)	1	203	129
Total other comprehensive income (loss) before income taxes	178	(268)	(7)	(70)
Income tax expense (benefit)	(12)	0	43	26
Total other comprehensive income (loss) after income taxes	190	(268)	(50)	(96)
Total comprehensive income (loss)	$ 1,989	$ (621)	$ 4,226	$ 510