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Income Taxes (Schedule Of Deferred Tax Assets And Valuation Allowance) (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Income Taxes [Abstract] |  |
Net operating loss carryforwards | $ 22,300 | $ 17,100
Stock-related compensation | 9,100 | 10,600
Research & development credit carryforwards | 6,200 | 6,000
Other | 200 | 500
Total deferred tax assets | 37,800 | 34,200
Valuation allowance | (37,800) | (34,200)
Net deferred tax assets |  |

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