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Fixed Assets, net - Schedule of Fixed Assets (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Property, Plant and Equipment [Line Items]    
Less: accumulated depreciation and amortization $ (8,123) $ (7,410)
Total 7,654 8,127
Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, Gross 2,576 2,330
Furniture and Fixtures [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, Gross 2,225 2,218
Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, Gross $ 10,976 $ 10,989