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INTANGIBLE ASSETS, NET (Tables) | 12 Months Ended
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Dec. 31, 2025
INTANGIBLE ASSETS, NET |
Schedule of intangible assets | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Customer | ​ | Operating | ​ | Operating | ​ | Favorable | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | relationship | ​ | lease | ​ | license | ​ | lease | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | intangibles | ​ | intangibles | ​ | intangibles | ​ | intangibles | ​ ​ ​ | Technology | ​ | Others | ​ | Total
​ | ​ ​ ​ | RMB | ​ ​ ​ | RMB | ​ ​ ​ | RMB | ​ ​ ​ | RMB | ​ | RMB | ​ ​ ​ | RMB | ​ ​ ​ | RMB
Intangible assets, net at January 1, 2025 |  | — | ​ | — | ​ | 175,558 | ​ | 11,563 | ​ | 79,314 | ​ | 25,707 | ​ | 292,142
Addition of software | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | 30 | ​ | 30
Decrease from disposal of centers |  | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | (145) | ​ | (145)
Amortization expenses |  | — | ​ | — | ​ | (12,422) | ​ | (1,564) | ​ | (13,219) | ​ | (8,917) | ​ | (36,122)
Intangible assets, net at December 31, 2025 |  | — | ​ | — | ​ | 163,136 | ​ | 9,999 | ​ | 66,095 | ​ | 16,675 | ​ | 255,905
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Intangible assets, net at December 31, 2025, in US$ |  | — | ​ | — | ​ | 23,328 | ​ | 1,430 | ​ | 9,451 | ​ | 2,385 | ​ | 36,594
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
At December 31, 2025 |  | ​ |  | ​ |  | ​ |  | ​ | ​ | ​ |  | ​ |  | ​
Intangible assets, cost |  | 32,449 | ​ | 418 | ​ | 248,440 | ​ | 21,010 | ​ | 132,190 | ​ | 51,728 | ​ | 486,235
Less: accumulated amortization |  | (31,486) | ​ | (418) | ​ | (85,304) | ​ | (11,011) | ​ | (66,095) | ​ | (35,053) | ​ | (229,367)
Less: intangible asset impairment |  | (963) | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | (963)
Intangible assets, net at December 31, 2025 |  | — | ​ | — | ​ | 163,136 | ​ | 9,999 | ​ | 66,095 | ​ | 16,675 | ​ | 255,905
Schedule of estimated annual amortization expenses | ​
​ | ​ | ​ | ​ | ​
​ | ​ | Amortization
​ | ​ ​ ​ | RMB | ​ ​ ​ | US$
2026 |  | 34,177 | ​ | 4,887
2027 |  | 29,380 | ​ | 4,201
2028 |  | 28,601 | ​ | 4,090
2029 |  | 28,372 | ​ | 4,057
2030 |  | 28,366 | ​ | 4,056
There after | ​ | 107,009 | ​ | 15,303
Total | ​ | 255,905 | ​ | 36,594
​

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