Consolidated Statements of Comprehensive Income $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($)
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 12,161
Other comprehensive income (loss), net of tax:
Change in foreign currency translation	(352)
Change in fair value of marketable securities	(1,000)
Total other comprehensive income (loss)	(1,352)
Comprehensive income	$ 10,809