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Other long-term liabilities (Tables) | 12 Months Ended
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Dec. 31, 2021
Other long-term liabilities |
Schedule of other long-term liabilities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ | As at December 31,
​ |  | Notes |  | 2020 |  | 2021 |  | 2021
​ | ​ | ​ | ​ | RMB | ​ | RMB | ​ | US$
Accrued unrecognized tax benefits & surcharge |  | i) |  | 74,728 |  | 75,347 |  | 11,824
Lease deposit received from hospital | ​ | ​ |  | 1,998 |  | 2,000 |  | 314
Convertible Note | ​ | ii) | ​ | — | ​ | 20,000 | ​ | 3,138
Others | ​ | ​ | ​ | — | ​ | 1,254 | ​ | 197
​ | ​ | ​ |  | 76,726 |  | 98,601 |  | 15,473
| i) | The amounts of unrecognized tax benefit are based on the recognition and measurement criteria of ASC Topic 740. The balance is presented as non-current liability in the consolidated financial statements as at December 31, 2021 due to the fact that the Group does not anticipate payments of cash within one year. The Group recorded accrued unrecognized tax benefits & surcharge amounting to RMB 74,728 and RMB 75,347 (US$11,824) (note 27) as of December 31, 2020 and 2021, respectively.
​
| ii) | Convertible Note
In December 2021, Healthingkon, a subsidiary of the Company, issued RMB20.0 million convertible note (“2021 Convertible Note”) to a single investor. Healthingkon received proceeds of RMB20.0 million on December 7, 2021 with no issuance costs. The Convertible Note bear interest of 4.75% per annum and have terms of 5 years upon the receipt of the principal.

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