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Property and Equipment, Net - Summary of Property and Equipment, Net (Detail) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Property Plant And Equipment [Line Items] |  |
Property and equipment, gross | $ 1,907 | $ 1,907
Less accumulated depreciation and amortization | (1,897) | (1,866)
Property and equipment, net | 10 | 41
Software and computer equipment [Member] |  |
Property Plant And Equipment [Line Items] |  |
Property and equipment, gross | 291 | 291
Furniture and fixtures [Member] |  |
Property Plant And Equipment [Line Items] |  |
Property and equipment, gross | 32 | 32
Leasehold improvements [Member] |  |
Property Plant And Equipment [Line Items] |  |
Property and equipment, gross | $ 1,584 | $ 1,584

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