Annual report pursuant to Section 13 and 15(d)

Income Taxes (Reconciliation of Effective Tax Rate, by Percentage) (Details)

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Income Taxes (Reconciliation of Effective Tax Rate, by Percentage) (Details)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Income Taxes [Abstract]    
Tax at U.S. statutory rate 21.00% 21.00%
State income taxes, net of federal benefit (0.30%) (0.40%)
Other nondeductible items 3.80% (1.00%)
Change in valuation allowance (22.20%) (22.50%)
Other (2.60%) 2.60%
Effective tax rate (0.30%) (0.30%)