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Income Taxes (Summary Of Difference Between Effective Income Tax Rates And Federal Statutory Rate) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Taxes [Abstract]
Federal tax at statutory rate	34.00%	34.00%	34.00%
Federal tax rate change	(109.68%)
Federal R&D credit	(0.40%)	2.89%	3.23%
Federal NOL adjustment for ASU	10.48%
Valuation allowance	55.84%	(24.93%)	(31.30%)
State income taxes	4.81%	(0.69%)	1.38%
Foreign NOL rate change	1.30%	(1.36%)	(2.02%)
Foreign tax rate differential	(2.45%)	(1.62%)	(1.99%)
Permanent differences and other	6.05%	(8.41%)	(3.43%)
Effective tax rate, Total	(0.05%)	(0.12%)	(0.13%)
Federal tax at statutory rate	$ (9,139)	$ (11,322)	$ (9,240)
Federal tax rate change	29,480
Federal R&D credit	107	(962)	(878)
Federal NOL adjustment for ASU	(2,816)
Valuation allowance	(15,009)	8,300	8,507
State income taxes	(1,292)	231	(375)
Foreign NOL rate change	(348)	452	549
Foreign tax rate differential	658	539	542
Permanent differences and other	(1,627)	2,802	931
Total tax expense	$ 14	$ 40	$ 36

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