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REDEEMABLE PREFERRED SHARES - Key terms of the convertible preferred shares (Details) - 12 months ended Dec. 31, 2020
$ / shares in Units, ¥ in Thousands, $ in Thousands
CNY (¥)
D
USD ($)
D
$ / shares
REDEEMABLE PREFERRED SHARES    
Issuance of ordinary shares in exchange of bonds payable | ¥ ¥ 65  
Redeemable preferred shares    
REDEEMABLE PREFERRED SHARES    
Dividend rate per annum 5.00% 5.00%
Increase dividend rate per annum 7.00% 7.00%
Increase in dividend rate each quarter thereafter if the Company has not redeemed all of the preferred shares outstanding as of the eighth anniversary of the Issue Date 0.50% 0.50%
Number of trading days | D 20 20
Consecutive trading days | D 30 30
Aggregate value of preferred shares | $   $ 10,000
Minimum percentage of the preferred shares issued as of the Issue Date, right to require the Company to sell all or a portion of its business and/or to conduct other fundraising or refinancing activities 90.00% 90.00%
Issuance costs | $   $ 2,646
Minimum percentage of outstanding preferred shares' written consent or affirmative vote needed for certain actions   75.00%
ADS    
REDEEMABLE PREFERRED SHARES    
Volume-weighted average price ("VWAP") per ADS | $ / shares   $ 53.40
Conversion price | $ / shares   $ 35.60