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SIGNIFICANT ACCOUNTING POLICIES (Tables)
 12 Months Ended
Dec. 31, 2017
Accounting Policies [Abstract]  
Property and Equipment Annual Depreciation Rates
Property and equipment are stated at cost, net of accumulated depreciation. Depreciation is calculated using the straight-line method over the estimated useful lives of the assets at the following annual rates:
 
 
%
   
Computers, peripheral equipment and software
15 - 33 (mainly 33)
Office furniture and equipment
6 - 20 (mainly 15)
Leasehold improvements
Over the shorter of the term of
the lease or the useful life of the asset
Schedule of Weighted Average Assumptions Used to Calculate Fair Value of Company's Stock Options
Employees' stock option plan:
 
   
Year ended
December 31,
  
   
2017
    
2016
    
2015
  
                   
Risk free interest rate
    
1.66
%
    
1.12
%
    
1.21
%
Dividend yields
    
0
%
    
0
%
    
0
%
Expected volatility
    
32
%
    
34
%
    
34
%
Weighted average expected term from grant date (in years)
    
3.80
      
3.88
      
3.86