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Fixed Assets, net - Schedule of Fixed Assets (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Property, Plant and Equipment [Line Items]    
Less accumulated depreciation and amortization $ (7,035) $ (6,304)
Total 8,354 9,122
Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, Gross 2,224 2,244
Furniture and Fixtures [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, Gross 2,218 2,218
Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, Gross $ 10,947 $ 10,964