Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ 5,951	$ (1,496)	$ 4,656
Other comprehensive loss components:
Foreign currency translation	(3,866)	(1,099)	(1,433)
Total other comprehensive loss	(3,866)	(1,099)	(1,433)
Comprehensive income (loss)	$ 2,085	$ (2,595)	$ 3,223