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Income Taxes (Schedule Of Deferred Tax Assets And Valuation Allowance) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Deferred tax assets: |  |
Net operating loss carryforwards | $ 18,333 | $ 17,110
Share-based compensation | 3,230 | 5,817
Research and development credit carryforwards | 6,687 | 6,587
Other | 264 | 237
Total deferred tax assets | 28,514 | 29,751
Valuation allowance | (28,447) | (29,725)
Net deferred tax assets: | 67 | 26
Deferred tax liabilities: |  |
Property and equipment | (5) | (7)
Operating lease right-of-use assets | (62) | (19)
Total deferred tax liabilities: | (67) | (26)
Net deferred tax asset / (liability): |  |

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