Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ 3,589	$ (1,040)	$ (1,314)	$ (4,594)
Other comprehensive income:
Foreign currency translation adjustment, net	(435)	172	(926)	274
Total comprehensive income (loss)	$ 3,154	$ (868)	$ (2,240)	$ (4,320)