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Property and Equipment (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 2,167 $ 2,376
Less - accumulated depreciation and amortization 1,965 1,878
Property and equipment, net 202 498
Computers and electronic equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 1,848 1,807
Land [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 263
Office furniture and equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 155 152
Vehicles [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 146 146
Leasehold improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 18 $ 8