| 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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873,225 |
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7.19 |
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Exercised
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(1,327,966 |
) |
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0.48 |
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Forfeited
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(118,892 |
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3.23 |
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Outstanding—June 30, 2012
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4,509,143 |
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3.57 |
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$ |
45,678 |
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Vested and expected to vest—June 30, 2012
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4,084,871 |
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3.46 |
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$ |
41,829 |
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Vested and exercisable—June 30, 2012
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2,270,319 |
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2.01 |
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$ |
26,540 |
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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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