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Property and Equipment - Summary of Property and Equipment, Net (Detail) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 7.2	$ 7.2
Less: Accumulated depreciation	(5.5)	(5.4)
Property and equipment, net	1.7	1.8
Furniture, Equipment and Other [Member]
Property Plant And Equipment [Line Items]
Property and equipment, gross	5.8	5.8
Leasehold Improvements [Member]
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 1.4	$ 1.4

X

- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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