Quarterly report pursuant to Section 13 or 15(d)

Furniture, Equipment and Leasehold Improvements, Net - Additional Information (Detail)

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Furniture, Equipment and Leasehold Improvements, Net - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Property Plant And Equipment [Line Items]      
Depreciation expense $ 281 $ 273  
Leased assets write off 82    
Accumulated depreciation 10,471   $ 10,190
Leased Assets      
Property Plant And Equipment [Line Items]      
Accumulated depreciation $ 64