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Share-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2014
Summary of Company's Employee Share Option Activity | The following table summarizes the Company’s employee share option activity under the share option plans:
|  | Number of options |  |  | Weighted average exercise price |  |  | Weighted average grant date fair value |  |  | Weighted average remaining contractual term |  |  | Aggregate intrinsic value |
|  |  |  |  | US$ |  |  | US$ |  |  | Years |  |  | US$ |
Outstanding, January 1, 2014 |  |  | 7,665,500 |  |  |  | 2.20 |  |  |  | 2.65 |  |  |  | 7.74 |  |  |  | 263,617 |
Granted |  |  | 177,600 |  |  |  | 2.20 |  |  |  | 34.57 |  |  |  |  |  |  |  |  |
Exercised |  |  | (2,939,863 | ) |  |  | 2.20 |  |  |  |  |  |  |  |  |  |  |  |  |
Forfeited |  |  | (35,000 | ) |  |  | 2.20 |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding, December 31, 2014 |  |  | 4,868,237 |  |  |  | 2.20 |  |  |  | 3.77 |  |  |  | 6.89 |  |  |  | 166,299 |
Vested and expected to vest at December 31, 2014 |  |  | 4,818,877 |  |  |  | 2.20 |  |  |  | 3.73 |  |  |  | 6.87 |  |  |  | 164,613 |
Exercisable as of December 31, 2014 |  |  | 2,149,037 |  |  |  | 2.20 |  |  |  | 2.52 |  |  |  | 6.53 |  |  |  | 73,411 |
Schedule of Restricted Shares Activity | Restricted shares activity for the year ended December 31, 2014 was as follows:
|  | Numbers of shares |  |  | Weighted average grant date fair value |
|  |  |  |  | US$ |
Outstanding, January 1, 2014 |  |  | 400,000 |  |  |  | 12.38 |
Granted |  |  | 507,063 |  |  |  | 37.30 |
Vested |  |  | (101,063 | ) |  |  | 12.64 |
Forfeited |  |  | (11,000 | ) |  |  |  |
Outstanding, December 31, 2014 |  |  | 795,000 |  |  |  | 27.87 |
Expected to vest, December 31, 2014 |  |  | 795,000 |  |  |  | 27.87 |
Schedule of Estimated Fair Value of Share-Based Awards on Respective Grant Dates using Binomial Option Pricing Model | The Company calculated the estimated fair value of the share-based awards on the respective grant dates using the binomial option pricing model with the following assumptions:
|  | 2012 |  | 2013 |  | 2014
Fair value of ordinary share |  | US$3.70 |  | US$4.58-US$11.64 |  | US$36.62
Risk-free interest rates |  | 1.73% |  | 2.07%-2.60% |  | 2.909%
Expected exercise multiple |  | 2.2 |  | 2.2 |  | 2.2
Expected volatility |  | 60.40% |  | 53.70%-55.49% |  | 53.5%
Expected dividend yield |  | 0.00% |  | 0.00% |  | 0.00%
Weighted average fair value per option granted |  | US$2.36 |  | US$3.03-US$9.69 |  | US$34.52-US$34.59
Schedule of Share-Based Compensation Expenses | Share-based compensation expenses relating to options granted to employees recognized for the year ended December 31, 2014 is as follows:
|  | Year ended December 31, |
|  | 2012 |  |  | 2013 |  |  | 2014 |
|  | RMB |  |  | RMB |  |  | RMB |  |  | US$ |
Cost of revenues |  |  | 6,553 |  |  |  | 6,534 |  |  |  | 8,048 |  |  |  | 1,298 |
Sales and marketing expenses |  |  | 4,177 |  |  |  | 4,375 |  |  |  | 14,644 |  |  |  | 2,360 |
General and administrative expenses |  |  | 15,734 |  |  |  | 11,738 |  |  |  | 20,557 |  |  |  | 3,313 |
Product development expenses |  |  | 2,678 |  |  |  | 2,961 |  |  |  | 13,417 |  |  |  | 2,162 |
|  |  | 29,142 |  |  |  | 25,608 |  |  |  | 56,666 |  |  |  | 9,133 |
Employees and Directors [Member] |
Summary of Company's Employee Share Option Activity | The following table summarizes the options granted to employees and directors during the years ended December 31, 2012, 2013 and 2014.
Grant Date |  | Contractual Terms |  | Number of Awards |  |  | Exercise Price (US$) |  |  | Vesting Schedule
July 1, 2012 |  | 10 years |  |  | 120,000 |  |  |  | 2.20 |  |  | (a)
May 27, 2013 |  | 10 years |  |  | 560,000 |  |  |  | 2.20 |  |  | (b)
October 22, 2013 |  | 10 years |  |  | 78,000 |  |  |  | 2.20 |  |  | (b)
October 22, 2013 |  | 10 years |  |  | 150,000 |  |  |  | 2.20 |  |  | (c)
January 16, 2014 |  | 10 years |  |  | 57,600 |  |  |  | 2.20 |  |  | (d)
January 16, 2014 |  | 10 years |  |  | 120,000 |  |  |  | 2.20 |  |  | (e)
As of December 31, 2014, share-based awards to purchase 5,663,237 Class A ordinary shares were outstanding and share-based awards to purchase 2,488,937 Class A ordinary shares were available for future grant under the 2011 Plan and 2013 Plan, respectively.
(a) | 25% of the awards have vested on each of July 1, 2013 and 2014 and the remainder of the awards will vest on an annual basis each July 1, thereafter, until July 1, 2016.
(b) | 25% of the awards have vested on January 1, 2014 and the remainder of the awards will vest on an annual basis each January 1, thereafter, until January 1, 2017.
(c) | 25% of the awards have vested on July 1, 2014 and the remainder of the awards will vest on an annual basis each July 1, thereafter, until July 1, 2017.
(d) | 25% of the awards have vested on January 16, 2014 and the remainder of the awards will vest on an annual basis each January 16, thereafter, until January 16, 2017.
(e) | 25% of the awards will vest on January 1, 2015 and the remainder of the awards will vest on an annual basis each January 1, thereafter, until January 1, 2018.
Employees [Member] |
Schedule of Restricted Shares Activity | The following table summarizes the restricted shares granted till December 31, 2014.
Grant Date |  | Vesting Schedule |  | Number of Awards |  |  | Fair Value per Share at the Grant date (US$) |
November 4, 2013 |  | (a) |  |  | 400,000 |  |  |  | 12.38 |
May 8, 2014 |  | (b) |  |  | 100,000 |  |  |  | 29.00 |
October 9, 2014 |  | (c) |  |  | 406,000 |  |  |  | 39.35 |
December 9, 2014 |  | (d) |  |  | 1,063 |  |  |  | 36.71 |
(a) | 25% of the awards have vested on September 29, 2014 and the remainder of the awards will vest on an annual basis each September 29, thereafter, until September 29, 2017.
(b) | The restricted shares granted on May 8, 2014 will vest over a period of approximately four years, with 25% of the awards vesting on various dates ranging from March 14, 2015 to May 13, 2015, and the remainder of the awards vesting on an annual basis thereafter, until 2018.
(c) | The restricted shares granted on October 9, 2014 will vest over a period of approximately four years, with 25% of the awards vesting on various dates ranging from January 1, 2015 to October 1, 2015, and the remainder of the awards vesting on an annual basis thereafter, until 2018.
(d) | The restricted shares granted on December 9, 2014 fully vested on the grant date.

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