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Property and Equipment - Summary of Property and Equipment (Detail) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 20,418 $ 19,210
Less accumulated depreciation (12,807) (11,678)
Net property and equipment 7,611 7,532
Computer Equipment and Software [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 10,979 9,858
Furniture and Fixtures [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 2,411 2,409
Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 7,028 $ 6,943