Quarterly report pursuant to Section 13 or 15(d)

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

v3.20.2
Furniture, Equipment and Leasehold Improvements, Net - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Property Plant And Equipment [Line Items]          
Depreciation expense $ 279 $ 267 $ 838 $ 815  
Leased assets write off 209 310 209 310  
Accumulated depreciation 9,911   9,911   $ 8,811
Leased Assets          
Property Plant And Equipment [Line Items]          
Accumulated depreciation $ 180 $ 310 $ 180 $ 310