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SIGNIFICANT ACCOUNTING POLICIES (Tables)
12 Months Ended
Dec. 31, 2014
SIGNIFICANT ACCOUNTING POLICIES [Abstract]  
Schedule of Depreciation Rates for Property and Equipment
 
%
   
Computers, software and related equipment
33
Laboratory equipment and office furniture
6 - 20 (mainly 20)
Leasehold improvements
Shorter of the term of the lease or useful life
Schedule of weighted-average assumptions for granted options
Year ended December 31,
 
2014
   
2013
   
2012
 
Volatility
56 %     71 %     82 %
Risk-free interest rate
1.53 %     1.25 %     0.66 %
Dividend yield
    0 %     0 %     0 %
Expected life (years)
    4.7       4.4       4.5