Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Net income (loss)	$ 893	$ (508)
Other comprehensive income (loss):
Foreign currency translation adjustments	1	(8)
Unrealized gain on available-for-sale marketable securities	(17)	16
Total comprehensive income (loss)	$ 877	$ (500)