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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
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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

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- Definition 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. + References No definition available. + Details
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- Definition The minimum percentage of outstanding preferred shares' written consent or affirmative vote needed for certain actions. + References No definition available. + Details
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- Definition The price per share of the conversion feature embedded in the preferred stock. + References No definition available. + Details
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- Definition Threshold period of specified consecutive trading days within which common stock price to conversion price of preferred stock must exceed threshold percentage for specified number of trading days to trigger conversion feature. + References No definition available. + Details
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- Definition Threshold number of specified trading days that common stock price to conversion price of preferred stock must exceed threshold percentage within a specified consecutive trading period to trigger conversion feature. + References No definition available. + Details
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