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GOODWILL (Tables) | 12 Months Ended
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Dec. 31, 2021
GOODWILL. |
Schedule of Goodwill | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the years ended December 31,
​ | ​ | 2019 | ​ | 2020 | ​ | 2021
​ | ​ | RMB | ​ | RMB | ​ | RMB | ​ | US$
Balance as of January 1 |  | 165,171 |  | 210,443 |  | 213,656 |  | 33,527
Addition | ​ | 45,272 | ​ | 3,213 | ​ | 368,221 | ​ | 57,782
Impairment |  | — |  | — |  | — |  | —
Balance as of December 31 |  | 210,443 |  | 213,656 |  | 581,877 |  | 91,309

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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13854-109267 + Details
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