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Share-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2021
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,
​ | ​ | (Amounts in Thousands)
​ |  | 2019 |  | 2020 |  | 2021 |  | 2021
​ | ​ | RMB | ​ | RMB | ​ | RMB | ​ | US$
Share options | ​ | 40,533 | ​ | 21,837 | ​ | 18,081 | ​ | 2,837
Non-vested restricted shares | ​ | 54,364 | ​ | 37,952 | ​ | 32,956 | ​ | 5,172
Total share-based compensation | ​ | 94,897 | ​ | 59,789 | ​ | 51,037 | ​ | 8,009
​
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: ​
​ | ​ | ​ | ​
​ |  | 2021 |
Average risk-free rate of return |  | 0.8~1.5 | %
Weighted average expected option life |  | 6.1~8.4 | years
Estimated volatility |  | 42.1~50.4 | %
Average dividend yield |  | Nil |
​
Summary of Stock Option Activity | The following table summarizes option activity during the year ended December 31, 2021: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | ​ |  | Weighted |  | ​
​ | ​ | ​ | ​ | Weighted | ​ | Average | ​ | Aggregate
​ | ​ | ​ | ​ | Average | ​ | Remaining | ​ | Intrinsic
​ | ​ | Number of | ​ | Exercise | ​ | Contractual | ​ | Value of
​ | ​ | options | ​ | Price | ​ | Term | ​ | Options
​ |  | ​ |  | RMB |  | Years |  | RMB
Outstanding as of January 1, 2021 | ​ | 224,528 | ​ | 505.33 | ​ | 5.5 | ​ | 17,848
Granted | ​ | 268,006 | ​ | 420.41 | ​ | ​ | ​ | ​
Exercised | ​ | (37,606) | ​ | 291.73 | ​ | ​ | ​ | ​
Forfeited or expired | ​ | (20,960) | ​ | 431.31 | ​ | ​ | ​ | ​
Outstanding as of December 31, 2021 | ​ | 433,968 | ​ | 474.97 | ​ | 7.9 | ​ | 18,389
Exercisable as of December 31, 2021 | ​ | 154,661 | ​ | 319.84 | ​ | 5.4 | ​ | 3,663
Summary of Non Vested Restricted Share Activity | A summary of non-vested restricted share activity during the year ended December 31, 2021 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, 2021 |  | 103,373 | ​ | 357.43
Granted |  | 120,050 | ​ | 399.33
Vested |  | (57,064) | ​ | 471.41
Forfeited |  | (15,525) | ​ | 530.50
Non-vested as of December 31, 2021 |  | 150,834 | ​ | 324.12

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