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Property and Equipment, Net (Tables)
12 Months Ended
Dec. 31, 2017
Property and Equipment, Net [Abstract]  
Schedule of composition of assets grouped by major classification
   December 31, 
   2017  2016 
        
 Cost:      
 Computers and electronic equipment $2,719  $1,885 
 Office furniture and equipment  231   615 
 Leasehold improvements  97   442 
          
    3,047   2,942 
 Accumulated depreciation:        
 Computers and electronic equipment  1,024   603 
 Office furniture and equipment  83   410 
 Leasehold improvements  16   413 
          
    1,123   1,426 
          
   $1,924  $1,516