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Stock Plans (Details) (USD $)
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12 Months Ended |
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Dec. 31, 2011
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Dec. 31, 2010
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Dec. 31, 2009
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Stock options
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| Summary of stock option activity |
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| Outstanding at beginning of the period (in shares) |
1,277,294 |
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| Granted (in shares) |
226,341 |
358,000 |
165,000 |
| Granted to replace options assumed in the MediaMind acquisition (in shares) |
1,153,300 |
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| Exercised (in shares) |
(16,206) |
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| Forfeited (in shares) |
(91,840) |
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| Expired (in shares) |
(64,045) |
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| Outstanding at the end of the period (in shares) |
2,484,844 |
1,277,294 |
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| Exercisable at end of the period (vested) (in shares) |
993,281 |
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| Weighted-Average Exercise Price |
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| Outstanding at the beginning of the period (in dollars per share) |
$ 19.64 |
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| Granted (in dollars per share) |
$ 20.45 |
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| Granted to replace options assumed in the MediaMind acquisition (in dollars per share) |
$ 16.63 |
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| Exercised / vested (in dollars per share) |
$ 13.09 |
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| Forfeited (in dollars per share) |
$ 20.78 |
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| Expired (in dollars per share) |
$ 40.08 |
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| Outstanding at the end of the period (in dollars per share) |
$ 17.79 |
$ 19.64 |
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| Exercisable at end of the period (vested) (in dollars per share) |
$ 16.37 |
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2011 Plan
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| Stock Plans |
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| Maximum number of shares of common stock with respect to which awards may be granted |
2,779,466 |
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| Term of stock option grants (in years) |
P10Y |
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| Vesting period (in years) |
4 years |
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| Number of shares of common stock available for future grant |
2,719,406 |
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