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LOSSES PER SHARE (Tables)
 12 Months Ended
Dec. 31, 2017
Earnings Per Share [Abstract]  
Schedule of computation of basic and diluted losses per share
The following table sets forth the computation of basic and diluted losses per share:
 
   
Year ended
December 31,
  
   
2017
    
2016
    
2015
  
Numerator:
                  
Net loss for basic loss per share
  
$
(37,066
)
  
$
(31,506
)
  
$
(20,163
)
                         
Net loss for basic loss per share
  
$
(37,066
)
  
$
(31,506
)
  
$
(20,163
)
                         
Denominator:
                        
 Weighted average number of ordinary shares used in computing basic net loss per share
    
51,179,694
      
50,855,908
      
50,437,040
  
                         
Basic and diluted earnings per ordinary share
  
$
(0.72
)
  
$
(0.62
)
  
$
(0.40
)