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Income Taxes (Summary Of Detail Of Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Deferred tax assets (liabilities):
Net operating loss carryforward	$ 64,776	$ 84,056
Research and development and AMT credit carryforwards, net	5,339	5,446
Equity compensation	6,955	8,406
Accruals and reserves	874	914
Inventories	588	1,503
Intangible assets	(11,297)	(16,922)
Property and equipment, net	(339)	(1,487)
Other, net	179	66
Subtotal	67,075	81,982
Less valuation allowance	(66,973)	(81,982)
Total	$ 102

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