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DEPOSITS FOR NON-CURRENT ASSETS (Tables) | 12 Months Ended
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Dec. 31, 2024
DEPOSITS FOR NON-CURRENT ASSETS |
Schedule of deposits for non-current assets | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As at December 31,
​ |  | 2023 |  | 2024 |  | 2024
​ |  | RMB |  | RMB |  | US$
Deposits for purchases of property, plant and equipment* |  | 4,646 | ​ | 174,883 | ​ | 23,959
​ |  | 4,646 | ​ | 174,883 | ​ | 23,959
| * | The remaining contractual obligations associated with these purchase contracts are approximately RMB271,876 and RMB190,488 (US$26,097)as at December 31, 2023 and 2024 respectively, which are included in the amount disclosed as purchase commitments in note 28. The addition in 2024 was mainly due to the increase in prepayment for proton therapy equipment. The Group recognized impairment loss on deposits for noncurrent assets of nil, nil and nil for the years ended December 31, 2022, 2023 and 2024, respectively. The amount of written off for the gross amount of deposits and the allowance is nil and nil for the years ended December 31, 2023 and 2024, respectively, since those deposits are deemed uncollectible.

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