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CONVERTIBLE NOTES - Summary of Convertible Notes Outstanding (Details) | 12 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2025 USD ($) | Dec. 31, 2025 CNY (¥) | Dec. 31, 2024 CNY (¥) | Dec. 31, 2023 CNY (¥) | Sep. 30, 2025 USD ($) | Feb. 28, 2025 USD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2024 CNY (¥) | Nov. 30, 2023 USD ($) | Nov. 13, 2023 USD ($) | Mar. 31, 2021 USD ($) | Mar. 17, 2021 USD ($)
CONVERTIBLE NOTES |  |  |  |  |  |  |  |  |  |  |  |
Conversion of convertible notes into ordinary shares, Principal |  | ¥ (52,418,000) | ¥ (98,428,000) |  |  |  |  |  |  |  |  |
Conversion of convertible notes into ordinary shares, Accrued Interest |  | (1,046,000) | (14,494,000) |  |  |  |  |  |  |  |  |
Exchange rate change on convertible notes' face value |  | (289,000) |  |  |  |  |  |  |  |  |  |
Amortization of debt discount premium (Interest Expenses) | $ 2,300,000 | 16,300,000 | 31,800,000 | ¥ 31,200,000 |  |  |  |  |  |  |  |
March Note |  |  |  |  |  |  |  |  |  |  |  |
CONVERTIBLE NOTES |  |  |  |  |  |  |  |  |  |  |  |
Principal amount | $ |  |  |  |  |  |  | $ 20,000,000 |  |  |  | $ 20,000,000 | $ 20,000,000
November Note |  |  |  |  |  |  |  |  |  |  |  |
CONVERTIBLE NOTES |  |  |  |  |  |  |  |  |  |  |  |
Principal amount | $ |  |  |  |  |  |  |  |  | $ 6,000,000 |  |  |
February Note |  |  |  |  |  |  |  |  |  |  |  |
CONVERTIBLE NOTES |  |  |  |  |  |  |  |  |  |  |  |
Principal amount | $ |  |  |  |  |  | $ 3,300,000 |  |  |  |  |  |
September Note |  |  |  |  |  |  |  |  |  |  |  |
CONVERTIBLE NOTES |  |  |  |  |  |  |  |  |  |  |  |
Principal amount | $ |  |  |  |  | $ 8,800,000 |  |  |  |  |  |  |
Convertible Notes Payable, Net |  |  |  |  |  |  |  |  |  |  |  |
CONVERTIBLE NOTES |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  | 48,152,000 |  |  |  |  |  | ¥ 43,061,000 |  | $ 6,000,000 |  |
Accrued Interest |  | 3,118,000 |  |  |  |  |  | 1,480,000 |  |  |  |
Modified the CB principal |  |  | 2,989,000 |  |  |  |  |  |  |  |  |
Repayment of convertible notes, Principal amount |  |  |  |  |  |  |  | (38,170,000) |  |  |  |
Repayment of convertible notes, Accrued interest |  |  |  |  |  |  |  | (3,590,000) |  |  |  |
Exchange rate change on convertible notes' face value |  | (289,000) | ¥ 3,653,000 |  |  |  |  |  |  |  |  |
Convertible Notes Payable, Net | March Note |  |  |  |  |  |  |  |  |  |  |  |
CONVERTIBLE NOTES |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  | 129,956,000 |  |  |  |
Accrued Interest |  |  |  |  |  |  |  | 18,084,000 |  |  |  |
Convertible Notes Payable, Net | November Note |  |  |  |  |  |  |  |  |  |  |  |
CONVERTIBLE NOTES |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  | 43,061,000 |  |  |  |  |  | 43,061,000 |  |  |  |
Accrued Interest |  | 2,044,000 |  |  |  |  |  | 1,480,000 |  |  |  |
Convertible Notes Payable, Net | February Note |  |  |  |  |  |  |  |  |  |  |  |
CONVERTIBLE NOTES |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  | 23,674,000 |  |  |  |  |  |  |  |  |  |
Accrued Interest |  | 1,091,000 |  |  |  |  |  |  |  |  |  |
Convertible Notes Payable, Net | September Note |  |  |  |  |  |  |  |  |  |  |  |
CONVERTIBLE NOTES |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  | 62,573,000 |  |  |  |  |  |  |  |  |  |
Accrued Interest |  | 1,029,000 |  |  |  |  |  |  |  |  |  |
Convertible Notes Payable, Net | Total |  |  |  |  |  |  |  |  |  |  |  |
CONVERTIBLE NOTES |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  | 76,601,000 |  |  |  |  |  | 43,061,000 |  |  |  |
Accrued Interest |  | 3,118,000 |  |  |  |  |  | ¥ 1,480,000 |  |  |  |
Convertible Notes Payable, Net | Less: Debt Discount |  |  |  |  |  |  |  |  |  |  |  |
CONVERTIBLE NOTES |  |  |  |  |  |  |  |  |  |  |  |
Less: Debt Discount |  | ¥ (28,449) |  |  |  |  |  |  |  |  |  |

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