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Income Taxes (Reconciliation of Statutory to Effective Income Tax Rate) (Details)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Income Taxes [Abstract]    
U.S. federal statutory income tax rate 21.00% 21.00%
State income taxes, net of federal tax 6.20% 6.60%
Stock-based compensation (0.80%) (0.70%)
Change in valuation allowance (27.20%) (28.50%)
Other 0.80% 1.60%
Effective income tax rate 0.00% 0.00%