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SHAREHOLDERS' EQUITY (Tables)
6 Months Ended
Jun. 30, 2013
SHAREHOLDERS' EQUITY [Abstract]  
Schedule of Weighted-average Assumptions Used to Estimate Fair Value of Options Granted
   
Six months ended
June 30,
 
   
2013
   
2012
 
             
Volatility
  58%-83%     73%-88%  
Risk-free interest rate
  0.54%-1.59%     0.56%-2.00%  
Dividend yield
  0%     0%  
Expected life (years) *)
  4.0 - 6.0     3.8-4.7  

 
*)
Excluding options that were granted to a consultant in connection with the mAb Funding Arrangement.