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Share-Based Awards Plan (Tables) | 12 Months Ended
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Dec. 31, 2016
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, |
|  | 2014 |  |  | 2015 |  |  | 2016 |  |  | 2016 |
|  | RMB |  |  | RMB |  |  | RMB |  |  | US$ |
|  | (In thousands) |
Expensed as cost of revenues |  |  | 34,611 |  |  |  | 49,770 |  |  |  | 103,354 |  |  |  | 14,886 |
Expensed as selling, general and administrative |  |  | 426,052 |  |  |  | 486,760 |  |  |  | 429,234 |  |  |  | 61,823 |
Expensed as research and development |  |  | 502,077 |  |  |  | 850,588 |  |  |  | 1,227,400 |  |  |  | 176,782 |
Capitalized as part of internal-used software |  |  | — |  |  |  | 1,381 |  |  |  | 214 |  |  |  | 31 |
Baidu |
Option Activity | The following table summarizes the option activity for the year ended December 31, 2016:
|  | 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, 2015 |  |  | 220,165 |  |  |  | 1,437.70 |  |  |  | 7.55 |  |  |  | 115,458 |
Granted |  |  | 50,409 |  |  |  | 1,684.20 |  |  |  |  |  |  |  |  |
Exercised |  |  | (26,933 | ) |  |  | 1,011.90 |  |  |  |  |  |  |  |  |
Expired/Cancelled |  |  | (31 | ) |  |  | 1,067.00 |  |  |  |  |  |  |  |  |
Forfeited |  |  | (12,371 | ) |  |  | 1,505.80 |  |  |  |  |  |  |  |  |
Outstanding, December 31, 2016 |  |  | 231,239 |  |  |  | 1,537.40 |  |  |  | 7.25 |  |  |  | 61,621 |
Vested and expected to vest at December 31, 2016 |  |  | 205,508 |  |  |  | 1,507.80 |  |  |  | 7.12 |  |  |  | 58,927 |
Exercisable at December 31, 2016 |  |  | 114,141 |  |  |  | 1,279.30 |  |  |  | 6.06 |  |  |  | 51,362 |
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:
|  | 2014 |  |  | 2015 |  |  | 2016 |
Risk-free interest rate |  |  | 1.52%~1.77% |  |  |  | 1.31%~1.36% |  |  |  | 1.13%~1.47% |
Dividend yield |  |  | — |  |  |  | — |  |  |  | — |
Expected volatility range |  |  | 40.96%~41.59% |  |  |  | 40.04%~40.57% |  |  |  | 38.91%~40.09% |
Weighted average expected volatility |  |  | 41.36% |  |  |  | 40.21% |  |  |  | 39.37% |
Expected life (in years) |  |  | 4.57 |  |  |  | 5.02~5.13 |  |  |  | 5.75~5.92 |
Restricted Shares Activity | Restricted shares activity for the year ended December 31, 2016 was as follows:
|  | Number of shares |  |  | Weighted average grant date fair value (US$) |
Restricted shares |  |  |  |  |  |  |  |
Unvested, December 31, 2015 |  |  | 344,534 |  |  |  | 1,853.50 |
Granted |  |  | 526,960 |  |  |  | 1,755.90 |
Vested |  |  | (93,409 | ) |  |  | 1,716.50 |
Cancelled |  |  | (242 | ) |  |  | 1,743.10 |
Forfeited |  |  | (70,572 | ) |  |  | 1,831.50 |
Unvested, December 31, 2016 |  |  | 707,271 |  |  |  | 1,800.70 |

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