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GOODWILL | 12 Months Ended
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Dec. 31, 2021
GOODWILL. |
GOODWILL | 11. GOODWILL The goodwill of RMB213,656 and RMB581,877 (US$91,309) as of December 31, 2020 and 2021 represented the goodwill of RMB165,171 generated from the acquisition of GFMH, CMCC, SJYH and BPMC by the Group in 2018, the goodwill of RMB45,272 generated from the acquisition of Tianjin Jiatai Group by the Group in 2019, the goodwill of RMB3,213 generated from the acquisition the New Spring Group in 2020, and the goodwill of RMB368,221 (US$57,782) generated from the acquisition the Healthingkon in 2021 (Note 4). The changes in the carrying amount of goodwill are as follow: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the years ended December 31,
​ | ​ | 2019 | ​ | 2020 | ​ | 2021
​ | ​ | RMB | ​ | RMB | ​ | RMB | ​ | US$
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
​ No impairment was recognized for the years ended December 31, 2019, 2020 and 2021.

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- Definition The entire disclosure for goodwill. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -URI http://asc.fasb.org/subtopic&trid=2144439 + Details
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