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Property and Equipment (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]    
Cost: $ 23,869 $ 22,121
Accumulated depreciation: 20,401 19,056
Depreciated cost 3,468 3,065
Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Cost: 918 795
Accumulated depreciation: 429 356
Computers and peripheral equipment [Member]    
Property, Plant and Equipment [Line Items]    
Cost: 14,842 14,059
Accumulated depreciation: 14,194 13,518
Office furniture and equipment[Member]    
Property, Plant and Equipment [Line Items]    
Cost: 3,778 3,111
Accumulated depreciation: 2,471 2,244
Motor vehicles [Member]    
Property, Plant and Equipment [Line Items]    
Cost: 1,237 1,186
Accumulated depreciation: 447 366
Software [Member]    
Property, Plant and Equipment [Line Items]    
Cost: 3,094 2,970
Accumulated depreciation: $ 2,860 $ 2,572