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SHARE-BASED EMPLOYEE REMUNERATION - Additional Information (Details) | 12 Months Ended
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Dec. 31, 2021 CNY (¥) | Dec. 31, 2020 CNY (¥) | Dec. 31, 2019 CNY (¥)
Disclosure Of SHARE-BASED EMPLOYEE REMUNERATION [Line Items] |  |  |
Fair value of share options granted | ¥ 1,835,000 | ¥ 1,135,000 | ¥ 626,000
Chief Financial Officer |  |  |
Disclosure Of SHARE-BASED EMPLOYEE REMUNERATION [Line Items] |  |  |
Number of share options granted in share-based payment arrangement | 33,269 | 46,256 | 94,862
Chief Executive Officer [Member] |  |  |
Disclosure Of SHARE-BASED EMPLOYEE REMUNERATION [Line Items] |  |  |
Number of share options granted in share-based payment arrangement | 81,010 | 36,201 |
Equity Compensation Plan2017 [Member] |  |  |
Disclosure Of SHARE-BASED EMPLOYEE REMUNERATION [Line Items] |  |  |
Number of share options granted in share-based payment arrangement | 333,333 |  |

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