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CONVERTIBLE PROMISSORY NOTES (Details) $ / shares in Units, ¥ in Thousands, $ in Thousands |  |  | 1 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Aug. 20, 2024 CNY (¥) | Aug. 20, 2024 USD ($) | Jan. 28, 2022 USD ($) | Feb. 29, 2024 USD ($) | Jan. 31, 2024 CNY (¥) | Dec. 31, 2023 CNY (¥) shares | Jun. 30, 2021 D item $ / shares | Jan. 31, 2021 USD ($) | Sep. 30, 2024 CNY (¥) D | Sep. 30, 2024 USD ($) D | Sep. 30, 2023 CNY (¥) | Sep. 30, 2023 USD ($) | Sep. 30, 2024 USD ($) $ / shares | Dec. 31, 2023 $ / shares
CONVERTIBLE PROMISSORY NOTES |  |  |  |  |  |  |  |  |  |  |  |  |  |
Changes in the fair value of convertible promissory notes |  |  |  |  |  |  |  |  | ¥ 2,537 | $ 362 | ¥ (21,718) |  |  |
Remaining amortization period for debt issuance cost |  |  |  |  |  |  |  |  | 5 years |  |  |  | 5 years |
Gain (Loss) on debt extinguishment |  |  |  |  |  |  |  |  | ¥ 246,175 | 35,080 |  |  |  |
Fair value due to instrument-specific credit changes |  |  |  |  |  |  |  |  | ¥ (7,109) | $ (1,013) |  |  |  |
Derivative liability |  |  |  |  |  |  |  |  |  |  |  |  |  |
CONVERTIBLE PROMISSORY NOTES |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss of convertible notes | ¥ 1,782,521 |  |  |  |  |  |  |  |  |  |  |  |  |
2026 Convertible Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
CONVERTIBLE PROMISSORY NOTES |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount | $ |  |  |  |  |  |  |  | $ 600,000 |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  | 0.00% |  |  |  |  |  |
Amount on exercise of option | $ |  |  |  |  |  |  |  | $ 75,000 |  |  |  |  |  |
Observation period |  |  |  |  |  |  | 40 days |  |  |  |  |  |  |
Conversion price (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  | $ 18.3574 |
Redemption price, percentage of Principal amount |  |  |  |  | 100.00% |  |  |  | 100.00% | 100.00% |  |  |  |
Proceeds from issuance of notes | $ |  |  |  |  |  |  |  |  |  | $ 600,000 |  |  |  |
Debt Issuance costs | $ |  |  |  |  |  |  |  |  |  |  |  |  | $ 13,841 |
Coupon Interest expense | $ |  |  |  |  |  |  |  |  |  | $ 0 |  | $ 0 |  |
Amortization of debt discount and issuance costs |  |  |  |  |  |  |  |  |  |  | ¥ 14,550 |  |  |
Effective interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  | 0.47% | 0.47% |  |
Repaid principal amount | $ |  |  |  | $ 600,000 |  |  |  |  |  |  |  |  |  |
Gain (Loss) on debt extinguishment |  |  |  |  | ¥ (41,261) |  |  |  |  |  |  |  |  |
2027 Convertible Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
CONVERTIBLE PROMISSORY NOTES |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount | $ |  |  | $ 250,000 |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  | 2.00% |  |  |  |  |  | 10.00% |  |  |  | 10.00% |
Conversion price (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  | $ 1.8333 |
Redemption price, percentage of Principal amount |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |
Changes in the fair value of financial liabilities |  |  |  |  |  |  |  |  | ¥ 132,538 |  | ¥ 21,718 |  |  |
Changes in the fair value of convertible promissory notes |  |  |  |  |  |  |  |  | 142,184 |  |  |  |  |
Coupon Interest expense |  |  |  |  |  |  |  |  | ¥ 22,594 |  | ¥ 26,233 |  |  |
Effective interest rate (as a percent) |  |  |  |  |  |  |  |  | 2.02% |  | 2.02% | 2.02% | 2.02% |
Related interest payables | 90,671 |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on debt extinguishment | ¥ 57,060 |  |  |  |  |  |  |  | ¥ 246,175 |  |  |  |  |
Repayment of convertible notes | $ |  |  | $ 1,000 |  |  |  |  |  |  |  |  |  |  |
Fair value of convertible notes |  |  |  |  |  |  |  |  | 1,793,894 |  |  |  |  |
Loss of convertible notes |  |  |  |  |  |  |  |  | 135,075 |  |  |  |  |
Fair value due to instrument-specific credit changes |  |  |  |  |  |  |  |  | ¥ 7,109 |  |  |  |  |
Consent Fee | $ |  | $ 37,500 |  |  |  |  |  |  |  |  |  |  |  |
Condition one | 2026 Convertible Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
CONVERTIBLE PROMISSORY NOTES |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trading days | D |  |  |  |  |  |  | 20 |  | 20 | 20 |  |  |  |
Consecutive trading days period | D |  |  |  |  |  |  | 30 |  | 30 | 30 |  |  |  |
Percentage of conversion price |  |  |  |  |  |  | 130.00% |  | 130.00% | 130.00% |  |  |  |
Condition Two | 2026 Convertible Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
CONVERTIBLE PROMISSORY NOTES |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trading days | D |  |  |  |  |  |  | 5 |  |  |  |  |  |  |
Consecutive trading days period | D |  |  |  |  |  |  | 10 |  |  |  |  |  |  |
Percentage of price to the last reported sale price |  |  |  |  |  |  | 98.00% |  |  |  |  |  |  |
American Depository Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |
CONVERTIBLE PROMISSORY NOTES |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion price (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  | $ 54.47 |
American Depository Shares | 2027 Convertible Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
CONVERTIBLE PROMISSORY NOTES |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion price (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  | 11 |
Conversion Threshold (as percent) |  |  |  |  |  |  |  |  | 200.00% | 200.00% |  |  |  |
Common Class A |  |  |  |  |  |  |  |  |  |  |  |  |  |
CONVERTIBLE PROMISSORY NOTES |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ordinary shares, par value (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.00001 | $ 0.00001
Proceeds from issuance of stock |  |  |  |  |  | ¥ 2,122,123 |  |  |  |  |  |  |  |
Payment of issuance costs |  |  |  |  |  | ¥ 37,720 |  |  |  |  |  |  |  |
Common Class A | Success Flow International Investment Limited |  |  |  |  |  |  |  |  |  |  |  |  |  |
CONVERTIBLE PROMISSORY NOTES |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares issued | shares |  |  |  |  |  | 455,296,932 |  |  |  |  |  |  |  |
Common Class A | Choice Faith Group Holdings Limited |  |  |  |  |  |  |  |  |  |  |  |  |  |
CONVERTIBLE PROMISSORY NOTES |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares issued | shares |  |  |  |  |  | 195,127,260 |  |  |  |  |  |  |  |
Common Class A | Condition one | 2026 Convertible Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
CONVERTIBLE PROMISSORY NOTES |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares represents one ADS | item |  |  |  |  |  |  | 6 |  |  |  |  |  |  |
Ordinary shares, par value (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 0.00001 |  |  |  |  |  |  |

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