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Share-Based Compensation - Option activity (Details) ¥ / shares in Units, ¥ in Thousands |  | 12 Months Ended
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Feb. 08, 2023 CNY (¥) | Dec. 31, 2023 CNY (¥) ¥ / shares shares | Dec. 31, 2023 CNY (¥) ¥ / shares $ / shares shares | Dec. 31, 2022 CNY (¥) ¥ / shares shares | Dec. 31, 2021 CNY (¥) ¥ / shares
Number of options |  |  |  |  |
Options outstanding, Beginning | shares |  | 9,608,634 |  |  |
Number of options granted | shares |  | 2,422,714 |  |  |
Forfeited | shares |  | 506,540 |  |  |
Exercised | shares |  | 1,333,087 |  |  |
Options outstanding, Ending | shares |  | 10,191,721 |  | 9,608,634 |
Vested and expected to vest at ending | shares |  | 10,191,721 | 10,191,721 |  |
Exercisable at ending | shares |  | 5,335,293 | 5,335,293 |  |
Weighted average exercise price |  |  |  |  |
At the beginning (in dollars per share) |  | ¥ 12.51 |  |  |
Granted (in dollars per share) |  | 14.49 |  |  |
Forfeited (in dollars per share) |  | 44.32 |  |  |
Exercised (in dollars per share) |  | 16.59 |  |  |
Outstanding at ending (in dollars per share) |  | 16.07 |  | ¥ 12.51 |
Vested and expect to vest |  | 16.07 | ¥ 16.07 |  |
Weighted average exercise price |  | 15.74 | ¥ 15.74 |  |
Weighted average grant date fair value |  |  |  |  |
At the beginning |  | 65.93 |  |  |
Weighted average grant-date fair value | (per share) |  | 55.08 | ¥ 55.08 | 121.62 | ¥ 102.74
Outstanding at ending |  | 62.08 |  | ¥ 65.93 |
Vested and expected to vest at ending |  | 62.08 |  |  |
Exercisable at ending |  | ¥ 50.36 |  |  |
Weighted average remaining contract life and Aggregate intrinsic value |  |  |  |  |
Outstanding |  | 4 years 11 months 19 days |  | 5 years 5 months 15 days |
Vested and expect to vest (in years) |  | 4 years 11 months 19 days |  |  |
Exercisable at ending |  | 4 years 4 months 2 days |  |  |
Outstanding | ¥ |  | ¥ 517,605 | ¥ 517,605 | ¥ 1,141,255 |
Vested and expected to vest at ending | ¥ |  | 517,605 | 517,605 |  |
Exercisable at ending | ¥ |  | 287,997 | 287,997 |  |
Unrecognized share-based compensation expense | ¥ |  | 291,247 | ¥ 291,247 |  |
Share-based compensation expenses | ¥ |  | ¥ 234,624 |  | ¥ 105,219 | ¥ 54,283
Unrecognized stock compensation expense, expected to be recognized over a weighted-average period |  | 2 years 4 months 6 days |  |  |
Weighted average grant-date fair value | (per share) |  | ¥ 55.08 | ¥ 55.08 | ¥ 121.62 | ¥ 102.74
Options exercised | ¥ |  | ¥ 74,380 |  | ¥ 0 | ¥ 0
Share-based compensation expenses related to share options without IPO condition | ¥ |  | ¥ 228,312 |  | ¥ 104,750 | ¥ 54,283
Share-based compensation expense | ¥ | ¥ 79,804 |  |  |  |

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