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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 $ 3,047 $ 2,942
Accumulated depreciation 1,123 1,426
Property, Plant and Equipment, Net 1,924 1,516
Computers and electronic equipment [Member]    
Property, Plant and Equipment [Line Items]    
Cost 2,719 1,885
Accumulated depreciation 1,024 603
Office furniture and equipment[Member]    
Property, Plant and Equipment [Line Items]    
Cost 231 615
Accumulated depreciation 83 410
Leasehold improvements [Member]    
Property, Plant and Equipment [Line Items]    
Cost 97 442
Accumulated depreciation $ 16 $ 413