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Property and Equipment - Summary of Property and Equipment, Net (Detail) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Property Plant And Equipment [Line Items]    
Property and equipment, gross $ 8.0 $ 7.2
Less: Accumulated depreciation (6.0) (5.4)
Property and equipment, net 2.0 1.8
Furniture, Equipment and Other [Member]    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 6.7 5.8
Leasehold Improvements [Member]    
Property Plant And Equipment [Line Items]    
Property and equipment, gross $ 1.3 $ 1.4