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Property and Equipment - Summary of Property and Equipment, Net (Detail) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Property Plant And Equipment [Line Items]    
Property and equipment, gross $ 7.2 $ 6.2
Less: Accumulated depreciation (5.4) (4.7)
Property and equipment, net 1.8 1.5
Furniture, Equipment and Other [Member]    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 5.8 5.2
Leasehold Improvements [Member]    
Property Plant And Equipment [Line Items]    
Property and equipment, gross $ 1.4 $ 1.0