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ORGANIZATION AND PRINCIPAL ACTIVITIES - Contractual agreement (Details)
 12 Months Ended
Aug. 17, 2017
Dec. 31, 2020
Business Operations Agreement    
Term of agreements   10 years
Extension term of agreements   10 years
Threshold period of advance written notice to the VIEs requesting not to extend the term, three months prior to the expiration dates   30 days
Period prior to expiration of the loan agreements for which advance written notice is given to VIEs   3 months
Exclusive Equity Option Agreement    
Term of agreements   10 years
Threshold period of advance written notice to the VIEs requesting not to extend the term, three months prior to the expiration dates   30 days
Exclusive Technical and Consulting Services Agreement    
Term of agreements   10 years
Extension term of agreements   10 years
Threshold period of advance written notice to the VIEs requesting not to extend the term, three months prior to the expiration dates 3 months  
Loan Agreements    
Term of agreements   10 years
Extension term of agreements   10 years
Period prior to expiration of the loan agreements for which advance written notice is given to VIEs   3 months