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Stock And Stock Options (Narrative) (Details) |  |  |  |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 25, 2021 | Mar. 17, 2017 $ / shares | Mar. 21, 2016 | Feb. 01, 2008 shares | Dec. 31, 2020 $ / shares | Oct. 25, 2020 shares | Dec. 31, 2019 $ / shares | Mar. 16, 2017 $ / shares
Stock Options [Line Items] |  |  |  |  |  |  |  |
Number of shares that may be granted | shares |  |  |  |  |  | 7,000,000 |  |
Number of additional shares that may be granted | shares |  |  |  | 3,500,000 |  |  |  |
Stock incentive plan term |  |  |  |  | 10 years |  |  |
Purchase price floor of fair market value |  |  |  |  | 85.00% |  |  |
Common stock, par value | $ / shares |  | $ 0.001 |  |  | $ 0.001 |  | $ 0.001 |
Reverse stock split |  |  | 0.1 |  |  |  |  |
Voluntary Resignation [Member] |  |  |  |  |  |  |  |
Stock Options [Line Items] |  |  |  |  |  |  |  |
Stock Incentive Plan exercisable period |  |  |  |  | 3 months |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |
Stock Options [Line Items] |  |  |  |  |  |  |  |
Reverse stock split | 0.083 |  |  |  |  |  |  |
Series A Preferred Stock [Member] |  |  |  |  |  |  |  |
Stock Options [Line Items] |  |  |  |  |  |  |  |
Exercise price | $ / shares |  |  |  |  |  |  |  | $ 1.10
Rights Plan [Member] |  |  |  |  |  |  |  |
Stock Options [Line Items] |  |  |  |  |  |  |  |
Common stock, Threshold for exercise of rights percentage |  | 4.95% |  |  |  |  |  |

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