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Property and Equipment (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]    
Property and equipment $ 38,391 $ 32,221
Less accumulated depreciation (27,580) (25,950)
Property and equipment, net 10,811 6,271
Tenant improvements    
Property, Plant and Equipment [Line Items]    
Property and equipment 2,019 1,530
Furniture and fixtures    
Property, Plant and Equipment [Line Items]    
Property and equipment 1,303 942
Equipment    
Property, Plant and Equipment [Line Items]    
Property and equipment $ 35,069 $ 29,749