Income Taxes (Schedule Of Difference Between Effective Income Taxes And Federal Statutory Income Tax) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Income Taxes [Abstract]
Expected income tax benefit	$ 3,303	$ 3,993
Expected state income taxes expense, net of federal tax benefit	216	(771)
Research and development credit	169	147
Foreign taxes and foreign loss not benefited	(925)	(904)
Change in valuation allowance	(1,440)	(2,224)
Stock-based compensation	(78)	(198)
True-ups	(51)	(155)
Unrealized tax benefits	(7)	154
Unrealized loss from foreign investments	(1,226)
Others	(9)	(71)
Provision for income taxes	$ (48)	$ (29)