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Stock Plans (Details Textual) (USD $)
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6 Months Ended | 1 Months Ended | 6 Months Ended | 1 Months Ended | 6 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | ||||||||||||
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Jun. 30, 2012
2003 Stock Plan [Member]
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Jun. 30, 2012
2003 Stock Plan [Member]
Maximum [Member]
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Jun. 30, 2012
2003 Stock Plan [Member]
Minimum [Member]
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Jun. 30, 2012
2011 Stock Option [Member]
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Dec. 31, 2011
2011 Stock Option [Member]
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Sep. 09, 2011
2011 Stock Option [Member]
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Sep. 30, 2011
2011 Employee Stock Purchase Plan [Member]
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Jun. 30, 2012
2011 Employee Stock Purchase Plan [Member]
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Sep. 09, 2011
2011 Employee Stock Purchase Plan [Member]
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Sep. 30, 2011
2011 Employee Stock Purchase Plan [Member]
Maximum [Member]
Period
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Jun. 30, 2012
2011 Employee Stock Purchase Plan [Member]
Maximum [Member]
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Jun. 30, 2012
Incapsula 2010 Share Incentive Plan [Member]
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Jun. 30, 2011
Incapsula 2010 Share Incentive Plan [Member]
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Mar. 31, 2010
Incapsula 2010 Share Incentive Plan [Member]
Maximum [Member]
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Jun. 30, 2012
Common Stock Subject to Repurchase [Member]
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Dec. 31, 2011
Common Stock Subject to Repurchase [Member]
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Dec. 31, 2010
Common Stock Subject to Repurchase [Member]
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Jun. 30, 2012
Common Stock Subject to Repurchase [Member]
Maximum [Member]
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Jun. 30, 2012
Common Stock Subject to Repurchase [Member]
Minimum [Member]
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Jun. 30, 2012
Early Exercise of Stock Options [Member]
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| Stock Plans (Textual) [Abstract] | ||||||||||||||||||||
| Maximum percentage of fair value of common stock on grant date | 85.00% | 85.00% | ||||||||||||||||||
| Minimum percentage of combined voting power | 10.00% | |||||||||||||||||||
| Maximum percentage of option price of fair value | 110.00% | |||||||||||||||||||
| Reserve of common stock issuance | 1,000,000 | 500,000 | 20,000,000 | 4,733,333 | ||||||||||||||||
| Increase percentage of common stock outstanding | 4.00% | 1.00% | ||||||||||||||||||
| Shares available for grant | 1,886,296 | |||||||||||||||||||
| Increase in reserve share | 919,127 | 229,782 | ||||||||||||||||||
| Maximum percentage of fair value of common stock on grant date | 100.00% | |||||||||||||||||||
| Percentage in payroll of deduction base salary to acquire shares of common stock | 15.00% | |||||||||||||||||||
| Offering period | 24 months | |||||||||||||||||||
| Number of purchase period for offering | 5 | |||||||||||||||||||
| Intrinsic value of option exercised | $ 15,400,000 | |||||||||||||||||||
| Number of years, shares reserved for issuance will increase | 8 years | |||||||||||||||||||
| Market value of common stock | $ 28.82 | |||||||||||||||||||
| Compensation cost related to unvested stock based awards granted, but not yet recognized | 12,000,000 | |||||||||||||||||||
| Nonvested awards, compensation cost not yet recognized, period for recognition | 2 years 6 months | |||||||||||||||||||
| Net cash proceeds from the exercise of stock options | 1,100,000 | 500,000 | ||||||||||||||||||
| Capitalized stock-based compensation cost | 0 | 0 | ||||||||||||||||||
| Recognized stock-based compensation tax benefits | $ 0 | $ 0 | ||||||||||||||||||
| Vesting Period | 10 years | 4 years | 10 years | 60 months | 48 months | |||||||||||||||
| Restricted common stock granted | 0 | 0 | 843,819 | |||||||||||||||||
| Weighted-average grant date fair value | $ 1.94 | |||||||||||||||||||
| Restricted common stock unvested | 527,387 | |||||||||||||||||||
| Unvested shares | 120,000 | |||||||||||||||||||