Condensed Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Statement of Comprehensive Income [Abstract]
Net loss	$ (3,121)	$ (2,300)	$ (9,222)	$ (9,160)
Other comprehensive (loss) income:
Foreign currency translation adjustments	(202)	41	(272)	127
Comprehensive loss	$ (3,323)	$ (2,259)	$ (9,494)	$ (9,033)