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Composition of Assets, Grouped by Major Classifications (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 13,001 $ 16,127
Less - Accumulated depreciation (8,196) (12,396)
Property and equipment, net 4,805 3,731
Computers, software and equipment    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 10,031 13,503
Office furniture and equipment    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 766 759
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 2,204 $ 1,865