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GOODWILL (Tables) | 12 Months Ended
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Dec. 31, 2022
GOODWILL. |
Schedule of goodwill | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the years ended December 31,
​ | ​ | 2020 | ​ | 2021 | ​ | 2022
​ | ​ | RMB | ​ | RMB | ​ | RMB | ​ | US$
Balance as of January 1 |  | 210,443 |  | 213,656 |  | 581,877 |  | 84,364
Addition | ​ | 3,213 | ​ | 368,221 | ​ | — | ​ | —
Disposal | ​ | — | ​ | — | ​ | (6,450) | ​ | (935)
Impairment |  | — |  | — |  | — |  | —
Balance as of December 31 |  | 213,656 |  | 581,877 |  | 575,427 |  | 83,429
​

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