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LONG-TERM INVESTMENTS - Additional information (Details) ¥ in Thousands, $ in Thousands |  | 1 Months Ended | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 28, 2019 | May 31, 2022 CNY (¥) | Mar. 31, 2022 CNY (¥) | Dec. 31, 2024 CNY (¥) director | Dec. 31, 2024 USD ($) director | Dec. 31, 2023 CNY (¥) | Dec. 31, 2022 CNY (¥) | Dec. 31, 2024 USD ($) | Oct. 31, 2022 CNY (¥) | Dec. 31, 2020 CNY (¥) | Dec. 31, 2019 CNY (¥) | Dec. 31, 2018 | Dec. 31, 2017 CNY (¥)
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |  |  |  |  |  |
Investment redeemed |  | ¥ 11,949 |  |  |  |  |  |  |  |  |  |  |
Investment in a joint venture |  |  |  | ¥ 102,000 | $ 13,974 | ¥ 0 | ¥ 0 |  |  |  |  |  |
Long-term investments | Other borrowings |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |  |  |  |  |  |
Assets pledged as collateral |  |  |  | ¥ 196,487 |  | ¥ 189,676 |  | $ 26,919 |  |  |  |  |
SH MZJH |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |  |  |  |  |  |
Capital contributed |  |  |  |  |  |  |  |  |  |  | ¥ 34,540 |  |
Suzhou Shengshan |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |  |  |  |  |  |
Equity interest in equity method investment |  |  |  | 5.15% |  | 5.15% |  | 5.15% |  | 5.15% | 5.15% | 5.41% | 8.13%
Capital contributed |  |  |  |  |  |  |  |  |  |  |  |  | ¥ 10,000
Proceeds from Dividends Received |  |  |  | ¥ 0 |  | ¥ 4,022 |  |  |  |  |  |  |
Shanghai Xinhe |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |  |  |  |  |  |
Equity interest in equity method investment |  |  | 99.99% | 72.73% |  | 72.23% |  | 72.73% |  |  |  |  |
Consideration amount |  |  |  |  |  | ¥ 60,000 |  |  |  |  |  |  |
Percentage of shares as consideration |  |  | 2.05% |  |  |  |  |  |  |  |  |  |
Carrying value of shares issued |  |  | ¥ 45,115 |  |  |  |  |  |  |  |  |  |
Shanghai Changshengshu | SH MZJH |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |  |  |  |  |  |
Equity interest in equity method investment |  |  |  |  |  |  |  |  | 20.00% |  |  |  |
Consideration amount |  |  |  |  |  |  |  |  | ¥ 2,000 |  |  |  |
Guangzhou Yicheng |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |  |  |  |  |  |
Equity interest in equity method investment |  |  |  | 30.00% |  | 30.00% |  | 30.00% |  |  |  |  |
Guangzhou Yicheng | GCMTIC |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |  |  |  |  |  |
Equity interest in equity method investment |  |  |  |  |  |  | 30.00% |  |  |  |  |  |
Consideration amount |  |  |  |  |  |  | ¥ 300 |  |  |  |  |  |
Number of directors entitled to delegate in the board | director |  |  |  | 1 | 1 |  |  |  |  |  |  |  |
Number of total directors | director |  |  |  | 3 | 3 |  |  |  |  |  |  |  |
Zhejiang Marine Leasing Ltd |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |  |  |  |  |  |
Equity interest in equity method investment |  |  |  | 20.00% |  | 20.00% |  | 20.00% |  |  |  |  |
Proceeds from Dividends Received |  |  |  | ¥ 10,000 | $ 1,370 | ¥ 8,000 |  |  |  |  |  |  |
Hebei CSPC Concord Hospital Management Co., LTD ("HCCH") |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |  |  |  |  |  |
Equity interest in equity method investment |  |  |  | 51.00% |  |  |  | 51.00% |  |  |  |  |
Investment in a joint venture |  |  |  | ¥ 102,000 | $ 14,000 |  |  |  |  |  |  |  |
China Medical Services Holdings Limited ("CMS Holdings") | Zhejiang Marine |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |  |  |  |  |  |
Equity interest in equity method investment | 20.00% |  |  |  |  |  |  |  |  |  |  |  |
Equity method investment legal interest percentage | 20.00% |  |  |  |  |  |  |  |  |  |  |  |
Guangdong Hengjian | Aohua Technology |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |  |  |  |  |  |
Equity interest in equity method investment |  |  |  | 14.20% |  | 14.20% | 14.20% | 14.20% |  | 37.21% |  |  |
Consideration amount |  |  |  | ¥ 86,649 |  | ¥ 86,649 | ¥ 86,649 |  |  | ¥ 346,748 |  |  |
Number of directors entitled to delegate in the board | director |  |  |  | 2 | 2 |  |  |  |  |  |  |  |
Number of total directors | director |  |  |  | 5 | 5 |  |  |  |  |  |  |  |

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