| Summary of the status of options granted under all options |
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Number of
Stock
Options |
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Weighted
Average
Exercise
Price |
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Aggregate
Intrinsic Value
(in
thousands) |
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Outstanding—December 31, 2011
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5,082,776 |
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$ |
2.14 |
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Granted
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1,167,575 |
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7.80 |
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Exercised
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(1,513,365 |
) |
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0.65 |
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Forfeited
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(144,405 |
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3.53 |
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Outstanding—September 30, 2012
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4,592,581 |
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4.02 |
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$ |
17,238 |
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Vested and expected to vest—September 30, 2012
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4,136,702 |
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3.87 |
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$ |
16,013 |
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Vested and exercisable—September 30, 2012
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1,887,012 |
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2.01 |
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$ |
10,507 |
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| Summary of the option grants and assumptions used in the Black-Scholes option pricing model to value the options |
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Grant Date
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Options
Granted |
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Weighted-
Average
Fair Value |
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Expected
Life of
Options
(In years) |
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Risk-Free
Interest
Rate |
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Expected
Volatility |
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Expected
Dividend
Yield |
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January 6, 2012
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238,000 |
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$ |
5.96 |
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6.25 |
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1.40 |
% |
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53 |
% |
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— |
% |
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April 15, 2012
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548,725 |
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$ |
7.10 |
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6.25 |
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1.61 |
% |
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61 |
% |
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— |
% |
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May 24, 2012
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86,500 |
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$ |
11.14 |
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6.25 |
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1.20 |
% |
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61 |
% |
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— |
% |
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July 16, 2012
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74,850 |
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$ |
15.45 |
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6.25 |
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0.97 |
% |
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59 |
% |
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— |
% |
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September 27, 2012
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219,500 |
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$ |
7.61 |
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6.25 |
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1.03 |
% |
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59 |
% |
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— |
% |
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