Condensed Consolidated Statements of Comprehensive Income (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	$ (417)	$ (3,019)	$ (9,777)	$ (8,284)
Other comprehensive income (loss):
Foreign currency translation adjustments	190	57	686	375
Unrealized gains (losses) from marketable securities, net of tax	(2)	4	(1)	(4)
Total other comprehensive income (loss)	188	61	685	371
Comprehensive loss	$ (229)	$ (2,958)	$ (9,092)	$ (7,913)