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SIGNIFICANT ACCOUNTING POLICIES (Tables) | 12 Months Ended
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Dec. 31, 2017
Accounting Policies [Abstract] |
Summary of Annual Rate of Depreciation on Property and Equipment | Depreciation is calculated using the straight-line method over the estimated useful lives of the assets at the following annual rates:
|  | %
Computers and peripheral equipment |  | 33 - 50
Office furniture and equipment |  | 10 - 20
Building |  | 4
Leasehold improvements |  | The shorter of term of the lease or the useful life of the asset
Weighted Average Assumptions Used to Estimate the Fair Value of Stock Options | The fair value of options granted and Employee Stock Purchase Plan in 2017, 2016 and 2015 is estimated at the date of grant using the following weighted average assumptions:
|  | Year ended December 31, |
Employee Stock Options |  | 2017 |  |  | 2016 |  |  | 2015 |
Expected volatility |  |  | 22.20 | % |  |  | 22.23 | % |  |  | 25.14 | %
Risk-free interest rate |  |  | 1.71 | % |  |  | 1.07 | % |  |  | 1.59 | %
Dividend yield |  |  | 0.0 | % |  |  | 0.0 | % |  |  | 0.0 | %
Expected term (years) |  |  | 4.76 |  |  |  | 4.65 |  |  |  | 5.59 |
Weighted Average Assumptions Used to Estimate the Fair Value of Employee Stock Purchase Plans | The fair value of options granted and Employee Stock Purchase Plan in 2017, 2016 and 2015 is estimated at the date of grant using the following weighted average assumptions:
|  | Year ended December 31, |
Employee Stock Purchase Plan |  |  |  |  |  |  |  |  |  |  |  |
Expected volatility |  |  | 18.21 | % |  |  | 23.24 | % |  |  | 21.89 | %
Risk-free interest rate |  |  | 0.50 | % |  |  | 0.16 | % |  |  | 0.07 | %
Dividend yield |  |  | 0.0 | % |  |  | 0.0 | % |  |  | 0.0 | %
Expected term (years) |  |  | 0.5 |  |  |  | 0.5 |  |  |  | 0.5 |
Components of Accumulated Other Comprehensive Income (Loss) | The following table shows the components of accumulated other comprehensive income (loss), net of taxes, for the year ended December 31, 2017:
|  | Year ended December 31, 2017 |
|  | Unrealized gains (losses) on marketable securities |  |  | Unrealized gains (losses) on cash flow hedges |  |  | Total |
Beginning balance |  | $ | (9,317 | ) |  | $ | 67 |  |  | $ | (9,250 | )
Other comprehensive gain (loss) before reclassifications |  |  | (6,537 | ) |  |  | 4,114 |  |  |  | (2,997 | )
Amounts reclassified from accumulated other comprehensive income |  |  | *) 135 |  |  |  | **) (4,096) |  |  |  | (3,387 | )
Net current-period other comprehensive income (loss) |  |  | (6,402 | ) |  |  | 18 |  |  |  | (6,384 | )
Ending balance |  | $ | (15,719 | ) |  | $ | 85 |  |  | $ | (15,634 | )
| *) | The reclassification out of accumulated other comprehensive income during the year ended December 31, 2017 for realized losses on marketable securities are included within financial income, net.
| **) | The reclassification out of accumulated other comprehensive income during the year ended December 31, 2017 for realized gains on cash flow hedges are included mostly within research and development expenses as well as other operating expenses.

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