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Property and Equipment (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 28,061 $ 28,015
Less: Accumulated depreciation and amortization (25,287) (25,094)
Property and equipment, net 2,774 2,921
Computer and Other Related Equipment    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 18,857 18,839
Purchased and Internally Developed Software    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 6,896 6,878
Furniture and Fixtures    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 1,023 1,023
Leasehold Improvements    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 1,285 $ 1,275