Income Taxes And Tax Status (Tables)	12 Months Ended
Dec. 31, 2021
Income Taxes And Tax Status [Abstract]
Schedule Of Effective Income Tax Rate Reconciliation	2021 2020Tax benefit at statutory rate$ (2,589) $ (4,111)State tax benefit (530) (842)Increase in valuation allowance 3,368 4,307Other (249) 646 $ - $ -
Schedule Of Deferred Tax Assets And Liabilities	2021 2020Gross deferred tax assets: Net operating loss carry-forward$ 78,600 $ 80,848Research and development credit carry-forward 6,028 6,603Stock compensation 356 122Patents and other 1,470 1,466Contingent payment obligations 6,341 5,235Fixed assets 53 54Accrued liabilities - 64Lease liabilities 38 77 92,886 94,469Less valuation allowance (92,886) (94,245) - 224Gross deferred tax liabilities: Convertible debt - (224) - (224)Net deferred tax asset$ - $ -
Schedule Of Unrecognized Tax Benefits Roll Forward	2021 2020Unrecognized tax benefits – beginning of year$ 927 $ 927Reduction as a result of lapse of statute of limitations (274) -Unrecognized tax benefits – end of year$ 653 $ 927

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Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets.

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Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations.

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Tabular disclosure of the change in unrecognized tax benefits.

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