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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 |  |  |

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