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Income Taxes (Schedule of Effective Income Tax Rate Reconciliation) (Details)
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Income Tax Disclosure [Abstract]    
Income tax computed at federal statutory tax rate 21.00% 21.00%
Permanent differences (1.40%) (0.30%)
State taxes, net of federal benefit 4.90% 4.90%
Research and development and other tax credits 4.40% 4.70%
Change in deferred tax asset valuation allowance 25.80% (30.40%)
Loss of Attributes - IRC 382 Ownership Change (54.70%)  
Other   0.10%