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Property and Equipment, Net (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]    
Cost $ 2,712 $ 2,460
Accumulated Depreciation 2,061 1,946
Property and equipment, net 651 514
Computers and software [Member]    
Property, Plant and Equipment [Line Items]    
Cost 1,173 1,046
Accumulated Depreciation 989 900
Office furniture and equipment [Member]    
Property, Plant and Equipment [Line Items]    
Cost 721 693
Accumulated Depreciation 536 492
Leasehold improvements [Member]    
Property, Plant and Equipment [Line Items]    
Cost 519 381
Accumulated Depreciation 307 280
Motor Vehicles [Member]    
Property, Plant and Equipment [Line Items]    
Cost 299 340
Accumulated Depreciation $ 229 $ 274