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REDEEMABLE PREFERRED SHARES - Movement of redeemable preferred shares (Details)
¥ in Thousands, $ / shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 10, 2019
shares
Mar. 27, 2019
USD ($)
$ / shares
shares
Mar. 19, 2019
shares
Jan. 26, 2018
shares
Dec. 31, 2020
CNY (¥)
Dec. 31, 2019
CNY (¥)
Movement of the redeemable preferred shares            
Balance at beginning of year         ¥ 1,061,981  
Balance at end of year         980,910 ¥ 1,061,981
Redeemable preferred shares            
Movement of the redeemable preferred shares            
Balance at beginning of year         1,061,981  
Issuance of redeemable preferred shares           989,349
Change in redemption value of redeemable preferred shares           17,760
Accrual of redeemable preferred shares dividends         52,709 40,344
Settlement of redeemable preferred shares dividends         (65,489) (25,014)
Foreign exchange impact         (68,291) 39,542
Balance at end of year         ¥ 980,910 ¥ 1,061,981
Redeemable preferred shares | PA Goldilocks Limited            
Movement of the redeemable preferred shares            
Issuance of shares (in shares) | shares   150,000        
Share price | $ / shares   $ 1        
Issuance of redeemable preferred shares | $   $ 150,000        
ADS            
Movement of the redeemable preferred shares            
Issuance of shares (in shares) | shares 6,318,680   13,731,343 8,000,000