Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ 446	$ (1,441)	$ 471	$ (3,027)
Other comprehensive income (loss):
Change in foreign currency translation adjustment, net	(91)	(32)	(69)	(136)
Comprehensive income (loss)	$ 355	$ (1,473)	$ 402	$ (3,163)