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DEPOSITS FOR NON-CURRENT ASSETS | 12 Months Ended
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Dec. 31, 2021
DEPOSITS FOR NON-CURRENT ASSETS |
DEPOSITS FOR NON-CURRENT ASSETS | 13. DEPOSITS FOR NON-CURRENT ASSETS Deposits for non-current assets consist of the following: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As at December 31,
​ |  | 2020 |  | 2021 |  | 2021
​ |  | RMB |  | RMB |  | US$
Deposits for purchases of property, plant and equipment* |  | 256,337 |  | 224,866 | ​ | 35,286
Reserve for unrecoverable deposits |  | (8,500) |  | — | ​ | —
​ |  | 247,837 |  | 224,866 | ​ | 35,286
* The amount represented interest-free non-refundable partial payments to suppliers of medical equipment and to construction engineering group for construction of hospitals. The remaining contractual obligations associated with these purchase contracts that the suppliers need to undertake are approximately RMB480,290 and RMB257,165 (US$40,355) as at December 31, 2020 and 2021 respectively, which are included in the amount disclosed as purchase commitments in note 27. The Group recognized impairment loss on deposits for non-current assets of RMB62,400, RMB8,500 and nil for the years ended December 31, 2019, 2020 and 2021, respectively. The amount of written off for the gross amount of deposits and the allowance is RMB93,260 and RMB8,500 (US$1,334) for the years ended December 31, 2020 and 2021, respectively, since those deposits are deemed uncollectible. As at December 31, 2020 and 2021, certain of the Group’s deposits for non-current assets with a total net book value of nil and nil were pledged for other borrowings of nil and nil, respectively (note 18).

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