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Share-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2019
Share-Based Compensation |
Share Based Compensation Expense by Type of Award | The following table presents the Company’s share-based compensation expense by type of award: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Years Ended December 31,
​ |  | 2017 |  | 2018 |  | 2019 |  | 2019
​ | ​ | RMB | ​ | RMB | ​ | RMB | ​ | US$
Share options | ​ | 51,054 | ​ | 45,973 | ​ | 40,533 | ​ | 5,822
Non-vested restricted shares | ​ | 42,581 | ​ | 66,790 | ​ | 54,364 | ​ | 7,809
Total share-based compensation | ​ | 93,635 | ​ | 112,763 | ​ | 94,897 | ​ | 13,631
​
Black Scholes Pricing Model Assumptions used to Estimate Fair Value of Options Granted | The Group uses the Black-Scholes pricing model and the following assumptions to estimate the fair value of the options granted or modified: ​
​ | ​ | ​ | ​ | ​ | ​
​ |  | 2017 |  | 2018 |
Average risk-free rate of return |  | 1.93 | % | 2.78 | %
Weighted average expected option life |  | 6.1 | years | 6.1 | years
Estimated volatility |  | 68.8 | % | 57.6 | %
Average dividend yield |  | Nil |  | Nil |
​ ​
Summary of Stock Option Activity | The following table summarizes option activity during the year ended December 31, 2019: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | ​ |  | Weighted |  | ​
​ | ​ | ​ | ​ | Weighted | ​ | Average | ​ | Aggregate
​ | ​ | ​ | ​ | Average | ​ | Remaining | ​ | Intrinsic
​ | ​ | Number of | ​ | Exercise | ​ | Contractual | ​ | Value of
​ | ​ | options | ​ | Price | ​ | Term | ​ | Options
​ |  | ​ |  | RMB |  | ​ |  | RMB
Outstanding as of January 1, 2019 | ​ | 571,474 | ​ | 343.14 | ​ | 7.0 | ​ | 34,344
Granted | ​ | — | ​ | — | ​ | ​ | ​ | ​
Exercised | ​ | (152,410) | ​ | 208.36 | ​ | ​ | ​ | ​
Forfeited | ​ | (32,359) | ​ | 312.85 | ​ | ​ | ​ | ​
Outstanding as of December 31, 2019 | ​ | 386,705 | ​ | 398.80 | ​ | 6.3 | ​ | 6,455
Exercisable as of December 31, 2019 | ​ | 272,521 | ​ | 390.15 | ​ | 7.2 | ​ | —
Summary of Non Vested Restricted Share Activity | A summary of non-vested restricted share activity during the year ended December 31, 2019 is presented below: ​
​ | ​ | ​ | ​ | ​
​ |  | ​ |  | Weighted-
​ |  | Number of |  | average
​ |  | non-vested |  | grant-
​ |  | restricted |  | date fair
Non-vested restricted shares | ​ | shares |  | value
​ | ​ | ​ |  | RMB
Non-vested as of January 1, 2019 |  | 370,613 | ​ | 483.29
Granted |  | 37,566 | ​ | 418.16
Vested |  | (124,592) | ​ | 506.02
Forfeited |  | (109,963) | ​ | 543.68
Non-vested as of December 31, 2019 |  | 173,624 | ​ | 427.59

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