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Fixed Assets - Schedule of Fixed Assets (Detail) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]    
Less accumulated depreciation and amortization $ (3,966) $ (3,261)
Total 11,318 11,748
Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, Gross 1,860 1,739
Furniture and Fixtures [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, Gross 2,415 2,393
Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, Gross $ 11,009 $ 10,877