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Income Taxes, Reconciliation Between Effective Tax Rates and Statutory Rates (Details)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Reconciliation of Income Tax Benefit Computed at Statutory Federal Income Tax Rate to Income Taxes [Abstract]      
U.S. federal tax at statutory rate 21.00% 21.00% 21.00%
Change in state tax apportionment 0.10% (17.40%) 15.80%
Stock compensation 0.90% (0.70%) 0.00%
Section 382 limitation 0.00% 0.00% (38.70%)
Valuation allowance (35.00%) (5.10%) 3.50%
Tax credits 13.50% 0.00% 0.00%
Other (0.50%) 2.10% (1.60%)
Effective tax rate 0.00% 0.00% 0.00%