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Income Taxes (Narrative) (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Operating Loss Carryforwards [Line Items]          
Income tax expense $ 40,000 $ 32,000 $ 108,000 $ 81,000  
Federal          
Operating Loss Carryforwards [Line Items]          
Operating loss carryforwards         $ 361,000,000.0
Tax credit carryforwards         9,300,000
State          
Operating Loss Carryforwards [Line Items]          
Operating loss carryforwards         6,200,000
Tax credit carryforwards         $ 1,800,000