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SHAREHOLDERS' EQUITY (Tables)
6 Months Ended
Jun. 30, 2012
SHAREHOLDERS' EQUITY [Abstract]  
Schedule of Weighted-average Assumptions Used to Estimate Fair Value of Options Granted
 
Six months ended June 30,

 
2012


2011

 





Volatility


73%-88%


78%-84%
Risk-free interest rate


0.56%-2.00%


2.00%-2.56%
Dividend yield


0%


0%
Expected life (years)


6.0


6.0