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SIGNIFICANT ACCOUNTING POLICIES (Tables)
 12 Months Ended
Dec. 31, 2017
SIGNIFICANT ACCOUNTING POLICIES [Abstract]  
Schedule of 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:

 
Percentage
   
Computers and peripheral equipment
20 – 33 (mainly 33)
Office furniture and equipment
10 – 20 (mainly 15)
Leasehold improvements
Over the shorter of the related lease period or the life of the asset
Summary of Fair Value Assumptions
The fair value for options granted in 2017, 2016 and 2015 is estimated at the date of grant using the Black-Scholes option-pricing model with the following weighted average assumptions:

   
Year ended December 31,
  
   
2017
    
2016
    
2015
  
                   
Dividend yield
    
0
%
    
0
%
    
0
%
Expected volatility
    
53
%
    
53
%
    
52
%
Risk-free interest
    
2.27
%
    
1.82
%
    
1.29
%
Expected life (in years)
    
5.9
      
5.3
      
4
Schedule of Changes in Accumulated Balances of Other Comprehensive Loss
The following table summarizes the changes in accumulated balances of other comprehensive loss for 2017:
 
   
Unrealized
gains
(losses) on
cash flow
hedges
    
Foreign
currency
translation
adjustment
    
Total
  
Beginning balance
  
$
(6
)
  
$
(1,007
)
  
$
(1,013
)
Other comprehensive gain (loss) before reclassifications
    
312
      
(235
)
    
77
  
Amounts reclassified from accumulated other comprehensive loss into earnings
    
(286
)
    
-
      
(286
)
Net current period other comprehensive income (loss)
    
26
      
(235
)
    
(209
)
Ending balance
  
$
20
    
$
(1,242
)
  
$
(1,222
)