Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ (1,410)	$ 248	$ (3,227)	$ (3,663)
Other comprehensive income (loss) components:
Foreign currency translation	639	(658)	1,690	(2,863)
Total other comprehensive income (loss)	639	(658)	1,690	(2,863)
Comprehensive income (loss)	$ (771)	$ (410)	$ (1,537)	$ (6,526)