Quarterly report pursuant to Section 13 or 15(d)

Property and Equipment - Schedule of Property and Equipment, Net (Detail)

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Property and Equipment - Schedule of Property and Equipment, Net (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Property, Plant and Equipment [Line Items]    
Less: accumulated depreciation and amortization $ (22,757) $ (20,789)
Property and equipment, net 17,159 17,153
Computer software and hardware equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment 17,172 16,247
Furniture, fixtures, and equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment $ 22,744 $ 21,695