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LONG-TERM INVESTMENTS - Equity method investments (Details) - CNY (¥) ¥ in Thousands | Dec. 31, 2025 | Dec. 31, 2024 | Mar. 31, 2022 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
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LONG-TERM INVESTMENTS |  |  |  |  |  |  |
Equity investments with readily determinable fair value | ¥ 6,539 | ¥ 28,699 |  |  |  |  |
Xi'an JiangyuanAndike Ltd. ("JYADK") |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |
Equity interest in equity method investment | 29.70% | 29.70% |  |  |  |  |
Equity investments with readily determinable fair value | ¥ 17,122 | ¥ 16,440 |  |  |  |  |
Suzhou Shengshan Huiying Venture Capital Investment LLP. ("Suzhou Shengshan") |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |
Equity interest in equity method investment | 5.15% | 5.15% |  | 5.15% | 5.15% | 5.41% | 8.13%
Equity investments with readily determinable fair value | ¥ 1,370 | ¥ 5,198 |  |  |  |  |
Zhejiang Marine Leasing Ltd |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |
Equity interest in equity method investment | 20.00% | 20.00% |  |  |  |  |
Equity investments with readily determinable fair value | ¥ 212,600 | ¥ 196,488 |  |  |  |  |
Guangdong Hengjian Proton Medical Industry Co., Ltd. ("Guangdong Hengjian") |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |
Equity interest in equity method investment | 14.20% | 14.20% |  |  |  |  |
Equity investments with readily determinable fair value | ¥ 85,643 | ¥ 85,781 |  |  |  |  |
Shanghai Xinhe Enterprise Management Center (Limited Partnership) ("Shanghai Xinhe") |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |
Equity interest in equity method investment | 0.00% | 72.23% | 99.99% |  |  |  |
Equity investments with readily determinable fair value | ¥ 0 | ¥ 22,448 |  |  |  |  |
Shanghai Changshengshu Management Co. Ltd. ("Shanghai Changshengshu") |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |
Equity interest in equity method investment | 0.00% | 20.00% |  |  |  |  |
Equity investments with readily determinable fair value | ¥ 0 | ¥ 663 |  |  |  |  |
Guangzhou Yicheng Biological Immune Technology Co. LTD("Guangzhou Yicheng") |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |
Equity interest in equity method investment | 0.00% | 30.00% |  |  |  |  |
Equity investments with readily determinable fair value | ¥ 0 | ¥ 178 |  |  |  |  |
Equity interest owned by the group |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |
Equity investments with readily determinable fair value | ¥ 415,463 | ¥ 428,842 |  |  |  |  |
Hebei CSPC Concord Hospital Management Co., LTD ("HCCH") |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |
Equity interest in equity method investment | 51.00% | 51.00% |  |  |  |  |
Equity investments with readily determinable fair value | ¥ 98,728 | ¥ 101,646 |  |  |  |  |

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