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SHARE-BASED EMPLOYEE REMUNERATION - Additional Information (Details) | 12 Months Ended
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Dec. 31, 2020 CNY (¥) | Dec. 31, 2019 CNY (¥) | Dec. 31, 2018 CNY (¥)
Disclosure Of SHARE-BASED EMPLOYEE REMUNERATION [Line Items] |  |  |
Number of share options granted in share-based payment arrangement |  | 94,862 | 56,919
Fair value of share options granted | ¥ 1,135,000 | ¥ 626,000 | ¥ 619,000
Chief Financial Officer [Member] |  |  |
Disclosure Of SHARE-BASED EMPLOYEE REMUNERATION [Line Items] |  |  |
Number of share options granted in share-based payment arrangement | 46,256 |  |
Chief Executive Officer |  |  |
Disclosure Of SHARE-BASED EMPLOYEE REMUNERATION [Line Items] |  |  |
Number of share options granted in share-based payment arrangement | 36,201 |  |
Equity Compensation Plan 2017 [Member] |  |  |
Disclosure Of SHARE-BASED EMPLOYEE REMUNERATION [Line Items] |  |  |
Number of share options granted in share-based payment arrangement | 280,000 |  |

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