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SUPPLEMENTARY DATA ON SELECTED STATEMENTS OF OPERATIONS (Tables)
 12 Months Ended
Dec. 31, 2017
Supplemental Income Statement Elements [Abstract]  
Supplemental Income Statement
Financial income (expenses), net:

   
Year ended December 31,
  
   
2017
    
2016
    
2015
  
Financial income:
                  
                   
Realized gain on marketable securities
  
$
234
    
$
135
    
$
1
  
Interest income and amortization/accretion of premium/discount on marketable securities or bank deposits
    
9
      
3
      
1
  
Dividend on equity marketable securities
    
16
      
25
      
30
  
                         
     
259
      
163
      
32
  
Financial expenses:
                        
                         
Bank charges
    
(28
)
    
(28
)
    
(25
)
Foreign currency translation adjustments
    
(4
)
    
(14
)
    
(45
)
                         
     
(32
)
    
(42
)
    
(70
)
                         
   
$
227
    
$
121
    
$
(38
)