Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 3,184	$ 905	$ (3,226)
Foreign currency translation adjustments	(180)	(507)	(769)
Comprehensive income (loss)	$ 3,004	$ 398	$ (3,995)