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Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2011
Significant Accounting Policies [Abstract] |
Summary Of Annual Rate Of Depreciation On Property And Equipment |
|  | %
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 Of Options Granted |
|  | Year ended December 31, |
Employee Stock Options |  | 2009 |  |  | 2010 |  |  | 2011 |
Expected volatility |  |  | 35.00 | % |  |  | 30.54 | % |  |  | 29.59 | %
Risk-free interest rate |  |  | 2.61 | % |  |  | 1.63 | % |  |  | 2.04 | %
Dividend yield |  |  | 0.0 | % |  |  | 0.0 | % |  |  | 0.0 | %
Expected term from vesting date (years) |  |  | 3.62 |  |  |  | 2.97 |  |  |  | 3.81 |
Employee Stock Purchase Plan |  |  |  |  |  |  |  |  |
Expected volatility |  |  | 46.90 | % |  |  | 20.20 | % |  |  | 23.94 | %
Risk-free interest rate |  |  | 0.31 | % |  |  | 0.16 | % |  |  | 0.14 | %
Dividend yield |  |  | 0.0 | % |  |  | 0.0 | % |  |  | 0.0 | %
Expected term (years) |  |  | 0.5 |  |  |  | 0.5 |  |  |  | 0.5 |

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- Definition Schedule Of Annual Rate Of Depreciation On Property And Equipment [Table Text Block] + References No definition available. + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, and (d) risk-free rate(s). + References No definition available. + Details
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- Details
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