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Income Taxes (Reconciliation of Income Tax Rate) (Details)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Income Taxes [Abstract]    
Statutory U.S. federal income tax rate 21.00% 21.00%
State income taxes, net of federal tax benefit 3.90% 2.90%
Valuation allowance (23.50%) (20.10%)
Foreign rate differential (0.10%) 0.00%
State rate and other changes in deferred taxes (0.40%) (1.10%)
Federal and state credits 0.10% 0.10%
Uncertain tax positions 0.00% 1.70%
Nondeductible expenses and other (1.40%) (4.30%)
Effective income tax rate (0.40%) 0.20%