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Income Taxes - Schedule of Tax Credits and Operating Loss Carryforwards (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Federal    
Operating Loss Carryforwards [Line Items]    
Net operating loss $ 12.1 $ 20.4
Federal | R&D credits    
Operating Loss Carryforwards [Line Items]    
Tax credits 0.0 0.0
Federal | Foreign tax credits    
Operating Loss Carryforwards [Line Items]    
Tax credits 0.1 0.1
State | California    
Operating Loss Carryforwards [Line Items]    
Net operating loss 162.0 167.7
State | California | R&D credits    
Operating Loss Carryforwards [Line Items]    
Tax credits 124.9 111.9
State | California | AMT Tax Credits    
Operating Loss Carryforwards [Line Items]    
Tax credits 0.5 0.5
State | Other states    
Operating Loss Carryforwards [Line Items]    
Net operating loss 5.8 7.8
Foreign | UK    
Operating Loss Carryforwards [Line Items]    
Net operating loss 0.0 0.0
Foreign | Other foreign    
Operating Loss Carryforwards [Line Items]    
Net operating loss $ 0.0 $ 6.0