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Income Taxes - Tax Credit Carryforwards (Details) - Research and development credit carryforward
$ in Millions
Dec. 31, 2021
USD ($)
Federal  
Tax credit carryforwards  
Tax credit carryforwards $ 35.6
State  
Tax credit carryforwards  
Tax credit carryforwards 18.4
Tax credit subject to expiration beginning in 2023 4.1
Tax credit not subject to expiration $ 14.3