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Share-Based Awards Plan (Tables) | 12 Months Ended
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Dec. 31, 2015
Total Share-Based Compensation Cost Recognized | The following table summarizes the total share-based compensation cost recognized by the Group:
|  | For the years ended December 31, |
|  | 2013 |  |  | 2014 |  |  | 2015 |  |  | 2015 |
|  | RMB |  |  | RMB |  |  | RMB |  |  | US$ |
|  | (In thousands) |
Expensed as cost of revenues |  |  | 23,976 |  |  |  | 34,611 |  |  |  | 49,770 |  |  |  | 7,683 |
Expensed as selling, general and administrative |  |  | 164,704 |  |  |  | 426,052 |  |  |  | 486,760 |  |  |  | 75,143 |
Expensed as research and development |  |  | 326,047 |  |  |  | 502,077 |  |  |  | 850,588 |  |  |  | 131,308 |
Capitalized as part of internal-used software |  |  | 229 |  |  |  | — |  |  |  | 1,381 |  |  |  | 213 |
Baidu, Inc. |
Option Activity | The following table summarizes the option activity for the year ended December 31, 2015:
|  | 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, 2014 |  |  | 198,392 |  |  |  | 1,141.00 |  |  |  | 7.83 |  |  |  | 225,915 |
Granted |  |  | 65,013 |  |  |  | 2,094.20 |  |  |  |  |  |  |  |  |
Exercised |  |  | (32,603 | ) |  |  | 1,062.30 |  |  |  |  |  |  |  |  |
Forfeited/Cancelled |  |  | (10,637 | ) |  |  | 1,067.00 |  |  |  |  |  |  |  |  |
Outstanding, December 31, 2015 |  |  | 220,165 |  |  |  | 1,437.70 |  |  |  | 7.55 |  |  |  | 115,458 |
Vested and expected to vest at December 31, 2015 |  |  | 190,759 |  |  |  | 1,426.70 |  |  |  | 7.50 |  |  |  | 101,807 |
Exercisable at December 31, 2015 |  |  | 82,485 |  |  |  | 1,086.50 |  |  |  | 6.43 |  |  |  | 66,942 |
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 years presented:
|  | 2013 |  |  | 2014 |  |  | 2015 |
Risk-free interest rate |  |  | 0.40%~1.35% |  |  |  | 1.52%~1.77% |  |  |  | 1.31%~1.36% |
Dividend yield |  |  | — |  |  |  | — |  |  |  | — |
Expected volatility range |  |  | 42.33%~44.17% |  |  |  | 40.96%~41.59% |  |  |  | 40.04%~40.57% |
Weighted average expected volatility |  |  | 43.33% |  |  |  | 41.36% |  |  |  | 40.21% |
Expected life (in years) |  |  | 3.08~4.57 |  |  |  | 4.57 |  |  |  | 5.02~5.13 |
Restricted Shares Activity | Restricted shares activity for the year ended December 31, 2015 was as follows:
|  | Number of shares |  |  | Weighted average grant date fair value (US$) |
Restricted shares |  |  |  |  |  |  |  |
Unvested, December 31, 2014 |  |  | 219,404 |  |  |  | 1,582.60 |
Granted |  |  | 247,141 |  |  |  | 1,979.30 |
Vested |  |  | (71,348 | ) |  |  | 1,516.00 |
Forfeited |  |  | (50,674 | ) |  |  | 1,767.80 |
Unvested, December 31, 2015 |  |  | 344,523 |  |  |  | 1,853.40 |

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