Condensed Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Statement of Comprehensive Income [Abstract]
Net loss	$ (852)	$ (1,228)	$ (3,421)	$ (2,866)
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustment	183	58	513	(281)
Unrealized holding gain (loss) on available-for-sale securities	3	1	3	14
Total other comprehensive income (loss)	186	59	516	(267)
Comprehensive loss	$ (666)	$ (1,169)	$ (2,905)	$ (3,133)