CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)
Net income (loss)	$ (1,970)	$ 966
Other comprehensive income (loss):
Foreign currency translation adjustment, net of tax	(53)	(51)
Net unrealized gains (losses) on available-for-sale investments, net of tax	55	(64)
Total other comprehensive income (loss)	2	(115)
Comprehensive income (loss)	$ (1,968)	$ 851