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Income Taxes (Schedule Of Effective Income Tax Rate Reconciliation) (Details)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Income Taxes [Abstract]    
Tax at federal statutory rate 21.00% 21.00%
State tax, net of federal benefit
Share-based compensation (42.80%) (2.40%)
Research and development credits 1.60% 0.60%
Change in valuation allowance 20.20% (19.20%)
Effective income tax rate