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SHARE-BASED EMPLOYEE REMUNERATION - Additional Information (Details)
1 Months Ended 12 Months Ended
Dec. 31, 2019
CNY (¥)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2019
CNY (¥)
Disclosure Of SHARE-BASED EMPLOYEE REMUNERATION [Line Items]        
Number of share options granted in share-based payment arrangement 94,862 56,919 27,394  
Fair value of share options granted ¥ 627,000 ¥ 619,000 ¥ 294,000 ¥ 627,000
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