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INCOME TAX EXPENSE/(CREDIT) - Additional Information (Details) - CNY (¥)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Jan. 01, 2008
Disclosure of INCOME TAX EXPENSE CREDIT [Line Items]        
Applicable tax rate 0.00% 25.00%    
Dividend withholding tax rate       10.00%
Undistributed earnings ¥ 241,065,000 ¥ 267,193,000 ¥ 329,503,000  
Deferred tax liabilities further recognition 8,704,000 13,360,000 16,475,000  
HONG KONG        
Disclosure of INCOME TAX EXPENSE CREDIT [Line Items]        
Applicable tax rate 8.25% 8.25% 8.25%  
Dividend withholding tax rate       5.00%