CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement of Comprehensive Income [Abstract]
Net loss	$ (5,688)	$ (11,612)	$ (8,383)
Other comprehensive loss, net of tax:
Foreign currency translation adjustment	(65)	(84)	(143)
Comprehensive loss	$ (5,753)	$ (11,696)	$ (8,526)