Condensed Consolidated Statements Of Comprehensive Income (Loss) (Unaudited) - 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	$ (2,309)	$ (2,485)	$ (8,482)	$ (10,908)
Other comprehensive income (loss):
Net change in foreign currency translation adjustments	405	(391)	1,101	(1,619)
Change in net unrealized gain (loss) on marketable securities, net of tax	0	0	0	1
Total other comprehensive income (loss)	405	(391)	1,101	(1,618)
Total comprehensive loss	$ (1,904)	$ (2,876)	$ (7,381)	$ (12,526)