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Property and Equipment - Summary of Property and Equipment (Detail) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 23,059 $ 19,210
Less accumulated depreciation (15,050) (11,678)
Net property and equipment 8,009 7,532
Computer Equipment and Software [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 12,126 9,858
Furniture and Fixtures [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 2,741 2,409
Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 8,192 $ 6,943