| Furniture, Equipment and Leasehold Improvements, Net - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | |
|---|---|---|
| Mar. 31, 2022 | Mar. 31, 2021 | |
| Property Plant And Equipment [Abstract] | ||
| Depreciation expense | $ 284 | $ 281 | 
| Leased assets write off | 82 | |
| Accumulated depreciation | $ 64 | |
| X | ||||||||||
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- Definition Accumulated depreciation related to leased assets written off. No definition available. 
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| X | ||||||||||
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- Definition Write off of leased assets. No definition available. 
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| X | ||||||||||
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- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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| X | ||||||||||
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- References No definition available. 
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