Annual report pursuant to Section 13 and 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
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Property Plant And Equipment [Line Items]      
Depreciation and amortization $ 978 $ 747 $ 975
Leased assets write off 310    
Accumulated depreciation $ 8,811 8,298  
Computer Equipment      
Property Plant And Equipment [Line Items]      
Property plant and equipment disposal   989  
Accumulated depreciation   $ 952