Income Taxes (Schedule Of Provision (Benefit) For Income Taxes) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Current:
Federal	$ (164)	$ 76	$ (14)
State	30	10	4
Foreign	27	12	0
Total current	(107)	98	(10)
Deferred:
Federal	(744)	(4,799)	(4)
State	1	0	1
Foreign	446	(470)	41
Total deferred	(297)	(5,269)	38
Total provision (benefit) for income taxes	$ (404)	$ (5,171)	$ 28