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LONG-TERM INVESTMENTS - Equity investments without readily determinable fair value (Details) ¥ in Thousands | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2025 CNY (¥) | Dec. 31, 2024 CNY (¥) | Aug. 31, 2023 | Mar. 31, 2021 | Dec. 31, 2018 | Dec. 31, 2015
LONG-TERM INVESTMENTS |  |  |  |  |  |
Equity investments with readily determinable fair value | ¥ 6,539 | ¥ 28,699 |  |  |  |
Legion Healthcare Partners LLC |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |
Percentage of equity interest sold | 5.8 | 5.83 |  | 5.8 |  |
Equity investments with readily determinable fair value | ¥ 6,439 | ¥ 6,439 |  |  |  |
Impairment | ¥ 0 | ¥ 0 |  |  |  |
Beijing He Xu elderly Care Service Co., LTD |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |
Percentage of equity interest sold | 4 | 4 | 4 |  |  |
Remaining ownership interest percentage | 4.00% |  |  |  |  |
Equity investments with readily determinable fair value | ¥ 100 | ¥ 100 |  |  |  |
Impairment | ¥ 0 |  |  |  |  |
Allcure Information |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |
Percentage of equity interest sold | 9.6 | 9.6 |  |  | 9.6 | 20
Equity investments with readily determinable fair value | ¥ 0 | ¥ 22,160 |  |  |  |
Impairment |  | ¥ 0 |  |  |  |

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