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SHARE-BASED EMPLOYEE REMUNERATION - Additional Information (Details)
 12 Months Ended
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