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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

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