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Composition of Assets, Grouped by Major Classifications (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 16,127 $ 13,943
Less-Accumulated depreciation (12,396) (11,338)
Property and equipment, net 3,731 2,605
Computers, software and equipment    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 13,503 12,180
Office furniture and equipment    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 759 633
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 1,865 $ 1,130