Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Comprehensive Income [Abstract]
Net loss		$ (8,232)	$ (11,034)	$ (7,517)
Other comprehensive (loss) income, net of tax:
Unrealized gain (loss) on marketable securities		1	(1)	(1)
Foreign currency translation adjustment		(3,473)	5,404	(9,288)
Unrealized gain on derivative instruments, net		58	89	80
Other comprehensive (loss) income, net of tax	[1]	(3,414)	5,492	(9,209)
Total comprehensive loss		$ (11,646)	$ (5,542)	$ (16,726)

[1] Tax impact was nominal for all periods.