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SHARE-BASED AWARDS PLAN (Tables) | 12 Months Ended
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Dec. 31, 2011
Total Share-Based Compensation Cost Recognized | The following table summarizes total compensation cost recognized:
|  | For the years ended December 31, |
|  | 2009 |  |  | 2010 |  |  | 2011 |  |  | 2011 |
|  | RMB |  |  | RMB |  |  | RMB |  |  | US$ |
|  | (In thousands) |
Cost of revenues |  |  | 6,374 |  |  |  | 6,302 |  |  |  | 7,527 |  |  |  | 1,196 |
Selling, general and administrative |  |  | 38,681 |  |  |  | 36,811 |  |  |  | 50,012 |  |  |  | 7,946 |
Research and development |  |  | 41,263 |  |  |  | 50,623 |  |  |  | 94,489 |  |  |  | 15,013 |
Recognized as part of internal-used software |  |  | 1,217 |  |  |  | 226 |  |  |  | 1,700 |  |  |  | 270 |
|  |  | 87,535 |  |  |  | 93,962 |  |  |  | 153,728 |  |  |  | 24,425 |
Baidu, Inc. |
Option Activity | The following table summarizes the option activity for the year ended December 31, 2011:
|  | Number of shares |  |  | Weighted average exercise price (US$) |  |  | Weighted average remaining contractual life (Years) |  |  | Aggregate intrinsic value (US$) (In thousands) |
Share options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding, December 31, 2010 |  |  | 99,175 |  |  |  | 237.99 |  |  |  | 2.57 |  |  |  | 72,164 |
Granted |  |  | 12,748 |  |  |  | 1,218.68 |  |  |  |  |  |  |  |  |
Exercised |  |  | (37,330 | ) |  |  | 105.57 |  |  |  |  |  |  |  |  |
Forfeited/Cancelled |  |  | (2,594 | ) |  |  | 511.19 |  |  |  |  |  |  |  |  |
Expired |  |  | — |  |  |  | — |  |  |  |  |  |  |  |  |
Outstanding, December 31, 2011 |  |  | 71,999 |  |  |  | 470.45 |  |  |  | 2.62 |  |  |  | 51,539 |
Vested and expected to vest at December 31, 2011 |  |  | 67,258 |  |  |  | 460.47 |  |  |  | 2.59 |  |  |  | 48,782 |
Exercisable at December 31, 2011 |  |  | 37,991 |  |  |  | 254.67 |  |  |  | 2.06 |  |  |  | 34,573 |
Assumptions Used to Estimate Fair Values of Share Options Granted | The following table presents the assumptions used to estimate the fair values of the share options granted in the periods presented:
|  | 2009 |  |  | 2010 |  |  | 2011 |
Risk-free interest rate |  |  | 1.18% |  |  |  | 0.61%~1.13% |  |  |  | 0.31%~1.03% |
Dividend yield |  |  | — |  |  |  | — |  |  |  | — |
Expected volatility range |  |  | 85.43% |  |  |  | 64.76%~69.70% |  |  |  | 48.20%~61.58% |
Weighted average expected volatility |  |  | 85.43% |  |  |  | 68.12% |  |  |  | 58.27% |
Expected life (in years) |  |  | 2.65 |  |  |  | 2.65~2.66 |  |  |  | 2.66~3.00
Restricted Shares Activity | Restricted shares activity for the year ended December 31, 2011 was as follows:
|  | Number of shares |  |  | Weighted average grant date fair value(US$) |
Restricted shares |  |  |  |  |  |  |  |
Unvested, December 31, 2010 |  |  | 49,617 |  |  |  | 643.22 |
Granted |  |  | 40,558 |  |  |  | 1,372.90 |
Vested |  |  | (27,115 | ) |  |  | 535.64 |
Forfeited |  |  | (6,838 | ) |  |  | 972.08 |
Unvested, December 31, 2011 |  |  | 56,222 |  |  |  | 1,181.49

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