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Acquisitions and disposals - Additional Information (Details) ¥ in Thousands, $ in Thousands | 1 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Oct. 31, 2023 CNY (¥) | Dec. 31, 2021 CNY (¥) item | May 31, 2021 CNY (¥) | Dec. 31, 2023 CNY (¥) | Dec. 31, 2023 USD ($) | Oct. 31, 2023 USD ($) | Dec. 31, 2022 CNY (¥) | Dec. 31, 2020 CNY (¥)
Business Acquisition |  |  |  |  |  |  |  |
Number of business combinations | item |  | 1 |  |  |  |  |  |
Goodwill |  | ¥ 3,420 |  | ¥ 80,751 | $ 11,374 |  | ¥ 3,420 | ¥ 3,119
Beijing Yifan Fengshun Medical Technology Co Ltd [Member] |  |  |  |  |  |  |  |
Business Acquisition |  |  |  |  |  |  |  |
Gross consideration to acquire business |  | ¥ 0 |  |  |  |  |  |
Equity ownership acquired |  | 100.00% |  |  |  |  |  |
Assets acquired |  | ¥ 13,507 |  |  |  |  |  |
Cash acquired |  | 1,328 |  |  |  |  |  |
Liabilities acquired |  | 13,809 |  |  |  |  |  |
Goodwill |  | ¥ 302 |  |  |  |  |  |
Yifangda |  |  |  |  |  |  |  |
Business Acquisition |  |  |  |  |  |  |  |
Transfer of ownership interest |  |  | 100.00% |  |  |  |  |
Zunsheng (Beijing) Investment Management Co., Ltd |  |  |  |  |  |  |  |
Business Acquisition |  |  |  |  |  |  |  |
Disposal consideration |  |  | ¥ 1 |  |  |  |  |
Gain or loss on disposal |  |  | 252 |  |  |  |  |
Carrying value of net assets |  |  | ¥ 252 |  |  |  |  |
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal, Statement of Income or Comprehensive Income [Extensible Enumeration] |  |  | Other Nonoperating Income (Expense) |  |  |  |  |
Supervally |  |  |  |  |  |  |  |
Business Acquisition |  |  |  |  |  |  |  |
Transfer of ownership interest | 100.00% |  |  |  |  | 100.00% |  |
Disposal consideration | $ |  |  |  |  |  | $ 1 |  |
Gain or loss on disposal | ¥ 2,169 |  |  |  |  |  |  |
Carrying value of net assets | ¥ 2,169 |  |  |  |  |  |  |
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal, Statement of Income or Comprehensive Income [Extensible Enumeration] | Other Nonoperating Income (Expense) |  |  |  |  |  |  |

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