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Income Taxes (Schedule Of Differences Between Statutory Tax And Effective Tax) (Details) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Income Taxes Schedule Of Differences Between Statutory Tax And Effective Tax |  |
Statutory rate | 21.00% | 21.00%
Net operating loss expiration | (14.70%) | (5.80%)
Tax credits | 2.80% | 3.70%
Change in valuation allowance | (9.10%) | (18.90%)
Total | 0.00% | 0.00%

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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details
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