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Income Taxes (Schedule Of Effective Income Tax Rate Reconciliation) (Details)
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Income Taxes [Abstract]      
Tax at federal statutory rate 21.00% 21.00% 21.00%
State tax, net of federal benefit  
Share-based compensation (0.50%) 1.20% (42.80%)
Research and development credits 4.90% 2.30% 1.60%
Section 162(m) limitation (0.20%) (0.50%)
Other (1.80%) (0.20%)
Change in valuation allowance (23.40%) (23.80%) 20.20%
Effective income tax rate