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INTANGIBLE ASSETS, NET (Tables) | 12 Months Ended
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Dec. 31, 2024
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, 2024 |  | — | ​ | — | ​ | 192,042 | ​ | 13,128 | ​ | 92,613 | ​ | 25,504 | ​ | 323,287
Addition of software | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | 9,873 | ​ | 9,873
Decrease from disposal of centers |  | — | ​ | — | ​ | (3,938) | ​ | — | ​ | — | ​ | (725) | ​ | (4,663)
Amortization expenses |  | — | ​ | — | ​ | (12,546) | ​ | (1,565) | ​ | (13,299) | ​ | (8,945) | ​ | (36,355)
Intangible assets, net at December 31, 2024 |  | — | ​ | — | ​ | 175,558 | ​ | 11,563 | ​ | 79,314 | ​ | 25,707 | ​ | 292,142
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Intangible assets, net at December 31, 2024, in US$ |  | — | ​ | — | ​ | 24,051 | ​ | 1,584 | ​ | 10,866 | ​ | 3,522 | ​ | 40,023
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
At December 31, 2024 |  |  |  |  |  |  |  |  | ​ |  |  |  |  |
Intangible assets, cost |  | 32,449 | ​ | 418 | ​ | 248,440 | ​ | 21,010 | ​ | 132,190 | ​ | 54,969 | ​ | 489,476
Less: accumulated amortization |  | (31,486) | ​ | (418) | ​ | (72,882) | ​ | (9,447) | ​ | (52,876) | ​ | (29,262) | ​ | (196,371)
Less: intangible asset impairment |  | (963) | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | (963)
Intangible assets, net at December 31, 2024 |  | — | ​ | — | ​ | 175,558 | ​ | 11,563 | ​ | 79,314 | ​ | 25,707 | ​ | 292,142
Schedule of estimated annual amortization expenses | ​
​ | ​ | ​ | ​ | ​
​ | ​ | Amortization
​ |  | RMB |  | US$
2025 |  | 35,959 | ​ | 4,926
2026 |  | 34,455 | ​ | 4,720
2027 |  | 29,395 | ​ | 4,027
2028 |  | 28,596 | ​ | 3,918
2029 |  | 163,736 | ​ | 22,432
​

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