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Fixed Assets - Schedule of Fixed Assets, Net (Detail) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Fixed assets, gross | $ 1,909 | $ 1,909
Less: Accumulated depreciation | (1,305) | (1,225)
Fixed assets, net | 604 | 684
Computer Equipment [Member] |  |
Fixed assets, gross | $ 117 | 117
Fixed assets, useful life | 5 years |
Lab Equipment [Member] |  |
Fixed assets, gross | $ 1,192 | 1,192
Fixed assets, useful life | 5 years |
Furniture and Fixtures [Member] |  |
Fixed assets, gross | $ 555 | 555
Fixed assets, useful life | 7 years |
Leasehold Improvements [Member] |  |
Fixed assets, gross | $ 45 | $ 45
Property, Plant, and Equipment, Useful Life, Term, Description [Extensible Enumeration] | us-gaap:UsefulLifeShorterOfTermOfLeaseOrAssetUtilityMember |

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