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Share-Based Compensation (Summary Of Options And Warrants By Exercise Price Range) (Details) - Stock Options [Member]
shares in Thousands
12 Months Ended
Dec. 31, 2021
$ / shares
shares
Options Outstanding  
Number Outstanding | shares 23,215
Wtd. Avg. Exercise Price $ 0.42
Wtd. Avg. Remaining Contractual Life 4 years 2 months 12 days
Options Vested  
Number Exercisable | shares 16,676
Wtd. Avg. Exercise Price $ 0.37
Wtd. Avg. Remaining Contractual Life 4 years 3 months 18 days
$0.171 - $0.33 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise price minimum $ 0.171
Exercise price maximum $ 0.33
Options Outstanding  
Number Outstanding | shares 9,289
Wtd. Avg. Exercise Price $ 0.18
Wtd. Avg. Remaining Contractual Life 4 years 7 months 6 days
Options Vested  
Number Exercisable | shares 9,289
Wtd. Avg. Exercise Price $ 0.18
Wtd. Avg. Remaining Contractual Life 4 years 7 months 6 days
$0.50 - $0.60 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise price minimum $ 0.50
Exercise price maximum $ 0.75
Options Outstanding  
Number Outstanding | shares 13,553
Wtd. Avg. Exercise Price $ 0.54
Wtd. Avg. Remaining Contractual Life 4 years
Options Vested  
Number Exercisable | shares 7,014
Wtd. Avg. Exercise Price $ 0.54
Wtd. Avg. Remaining Contractual Life 4 years
$1.98 - $2.13 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise price minimum $ 1.98
Exercise price maximum $ 2.97
Options Outstanding  
Number Outstanding | shares 373
Wtd. Avg. Exercise Price $ 2.02
Wtd. Avg. Remaining Contractual Life 2 years 6 months
Options Vested  
Number Exercisable | shares 373
Wtd. Avg. Exercise Price $ 2.02
Wtd. Avg. Remaining Contractual Life 2 years 6 months