Consolidated Statements of Compehensive Loss - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Statement of Comprehensive Income [Abstract]
Net loss	$ (4,623)	$ (4,103)
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustment	617	(853)
Unrealized holding gain (loss) on available-for-sale securities	(1)	10
Total other comprehensive income (loss)	616	(843)
Comprehensive loss	$ (4,007)	$ (4,946)