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Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2016
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 6)
 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, 
   2016  2015  2014 
           
 Risk-free interest  1.09%  1.13%  1.26 
 Dividend yields  0   0   0 
 Volatility  85%  76%  84%
 Expected option term  3.5 years   3.8 years   4 years 
 Forfeiture rate  0%  0%  0%