Annual report pursuant to Section 13 and 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
Dec. 31, 2016
Dec. 31, 2015
Property, Plant and Equipment [Line Items]    
Less: accumulated depreciation and amortization $ (18,294) $ (16,441)
Property and equipment, net 16,355 11,579
Computer software and hardware equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment 14,583 10,973
Furniture, fixtures, and equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment $ 20,066 $ 17,047