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Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2014
Significant Accounting Policies [Abstract]  
Schedule of property, plant and equipment depreciation rates

   %  
      
 Computers and software 20 – 33 (Mainly 33)
 Office furniture and equipment 6 - 15 (Mainly 10)
 Leasehold improvements 

Over the shorter of the period

of the lease or the life of the assets

  
 Motor vehicles 15  

 
Schedule of weighted-average assumptions used in valuation of stock option

 

      Year ended 
December 31,		  
      2014     2013     2012  
                     
  Risk-free interest     1.26 %     0.93 %     1.34 %
  Dividend yields     0 %     0 %     0 %
  Volatility     84 %     89 %     83 %
  Expected option term     4 years       3.5 years       3 years  
  Forfeiture rate     0 %     0 %     0 %