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Fixed Assets - Schedule of Fixed Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Property, Plant and Equipment [Line Items]    
Less accumulated depreciation and amortization $ (3,261) $ (1,978)
Total 11,748 11,974
Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, Gross 1,739 1,258
Furniture and Fixtures [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, Gross 2,393 2,382
Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, Gross $ 10,877 $ 10,312