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CONVERTIBLE BONDS PAYABLE (Details)
$ / shares in Units, ¥ in Thousands, $ in Thousands
12 Months Ended
Jun. 05, 2018
USD ($)
$ / shares
Dec. 31, 2020
CNY (¥)
Dec. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
CNY (¥)
CONVERTIBLE BONDS PAYABLE          
Debt issuance costs   ¥ 226,085     ¥ 273,822
Accrued interests   65,390     ¥ 43,776
Denominations for repurchase of Notes | $       $ 1  
Conversion of convertible bonds   65      
Additional paid-in capital          
CONVERTIBLE BONDS PAYABLE          
Conversion of convertible bonds   65      
Accrued expenses          
CONVERTIBLE BONDS PAYABLE          
Accrued interests   ¥ 3,262      
ADS          
CONVERTIBLE BONDS PAYABLE          
Principal amount | $ $ 1        
Conversion rate per US$1,000 principal amount 19.3865        
Basis of issuance of shares for debt conversion (in dollar per share) | $ / shares $ 51.58        
Convertible Bonds due 2025          
CONVERTIBLE BONDS PAYABLE          
Principal amount | $ $ 300,000     $ 299,990  
Debt issuance costs | $ $ 8,948        
Interest per annum (as a percent) 2.00%        
Maximum principal amount convertible to ordinary shares (as a percent) 100.00%        
Principal amount converted | $     $ 10    
Effective interest rate   2.65%   2.65% 2.65%
Convertible Bonds due 2025 | Additional paid-in capital          
CONVERTIBLE BONDS PAYABLE          
Conversion of convertible bonds   ¥ 65