|
Stock Plans (Details 3) (USD $)
In Millions, except Share data, unless otherwise specified
|
12 Months Ended |
|
Dec. 31, 2011
year
|
Dec. 31, 2010
year
|
Dec. 31, 2009
year
|
| Stock Plans |
|
|
|
| Unrecognized compensation costs related to unvested options, restricted stock awards |
$ 26.5 |
|
|
| Weighted average vesting period for recognition of compensation costs (in years) |
2.3 |
|
|
|
Stock options
|
|
|
|
| Stock Plans |
|
|
|
| Weighted average grant-date fair value of options granted for MediaMind replacement options (in dollars per share) |
$ 20.21 |
|
|
| Weighted average grant-date fair value of options granted excluding MediaMind replacement options (in dollars per share) |
$ 11.03 |
$ 14.78 |
$ 14.62 |
| Weighted-average remaining contractual life of vested stock options (in years) |
6.1 |
|
|
| Intrinsic value of options exercised |
0.3 |
1.7 |
2.1 |
| Intrinsic value of options outstanding |
1.9 |
|
|
| Intrinsic value of options exercisable |
$ 1.3 |
|
|
| Fair value assumptions used in computation of grant date fair value of options |
|
|
|
| Number of options granted (in shares) |
226,341 |
358,000 |
165,000 |
| Weighted average exercise price of options granted (in dollars per share) |
$ 20.45 |
$ 26.09 |
$ 25.37 |
| Volatility (as a percent) |
60.00% |
58.00% |
58.00% |
| Risk free interest rate (as a percent) |
1.70% |
2.30% |
3.00% |
| Expected term (in years) |
6.3 |
6.3 |
6.3 |