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Fixed Assets - Schedule of Fixed Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]    
Less accumulated depreciation and amortization $ (4,672) $ (3,261)
Total 10,693 11,748
Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, Gross 1,879 1,739
Furniture and Fixtures [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, Gross 2,449 2,393
Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, Gross $ 11,037 $ 10,877