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Income Taxes - Components of Provision for Income Taxes (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Current    
Federal $ 0.0 $ 0.0
State 0.4 0.1
Foreign 0.8 1.2
Total current provision 1.2 1.3
Deferred    
Federal 0.0 0.0
State 0.0 0.0
Foreign (0.7) 0.0
Total deferred provision (0.7) 0.0
Income taxes expense $ 0.5 $ 1.3