CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 8,714	$ 11,526	$ 9,200	$ 10,914
Other comprehensive income (loss):
Net foreign currency translation gain (loss)	10	6	(3)	2
Change in net unrealized gain (loss) on marketable securities	(252)	245	453	383
Tax provision on other comprehensive income (loss)	57	0	(103)	0
Other comprehensive income (loss), net of tax	(185)	251	347	385
Comprehensive income	$ 8,529	$ 11,777	$ 9,547	$ 11,299