Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Net loss	$ (216)	$ (2,506)
Other comprehensive income:
Foreign currency translation adjustments	416	116
Unrealized gains (losses) from marketable securities, net of tax	(1)	1
Total other comprehensive income	415	117
Comprehensive income (loss)	$ 199	$ (2,389)