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Income Taxes (Net Operating Loss Carryforwards and Tax Credits) (Narrative) (Details)
$ in Thousands
Dec. 31, 2022
USD ($)
Tax Credit Carryforward [Line Items]  
Operating loss carryforwards, carried forward indefinetly $ 31,705
Federal [Member]  
Tax Credit Carryforward [Line Items]  
Operating loss carryforwards 154,992
Tax credit carryforwards, research 6,747
State [Member]  
Tax Credit Carryforward [Line Items]  
Operating loss carryforwards 9,600
Tax credit carryforwards, research 5,173
Foreign [Member]  
Tax Credit Carryforward [Line Items]  
Operating loss carryforwards 42,668
Tax credit carryforwards, research 21,850
General foreign tax credit 84
Canada Revenue Agency [Member] | Foreign [Member]  
Tax Credit Carryforward [Line Items]  
Tax credit carryforwards, research $ 120,277