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v3.25.4

Loans from a Third Party (Details) ¥ in Millions, $ in Millions | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2025 USD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2023 CNY (¥) | Dec. 31, 2022 USD ($) | Dec. 31, 2022 CNY (¥) | Jun. 30, 2025 CNY (¥) | Dec. 31, 2024 CNY (¥) | Dec. 31, 2023 CNY (¥)
Loans from a Third Party [Line Items] |  |  |  |  |  |  |  |  |
Outstanding balances |  |  |  |  | $ 21.7 | ¥ 157.4 |  |  |
Interest expense | $ 0.9 |  |  |  |  |  |  |  |
Repaid instalment plan |  |  | $ 7.9 | ¥ 56.0 |  |  |  |  |
Tianjin Yizhong Jinshajiang Equity Investment Fund Partnership [Member] |  |  |  |  |  |  |  |  |
Loans from a Third Party [Line Items] |  |  |  |  |  |  |  |  |
Loans | $ 18.0 | $ 18.0 |  |  |  |  | ¥ 115.0 | ¥ 115.0 |
Interest rate per annum | 8.00% | 8.00% |  |  |  |  | 8.00% | 8.00% |
Term of agreements | 1 year | 1 year |  |  |  |  |  |  |
Other income (expense) |  |  |  |  | 0.7 | 4.4 |  |  |
Accrued interests |  |  |  |  | $ 6.1 | ¥ 41.4 |  |  |
Tianqi Group [Member] |  |  |  |  |  |  |  |  |
Loans from a Third Party [Line Items] |  |  |  |  |  |  |  |  |
Repaid amount |  |  | 7.9 | ¥ 56.0 |  |  |  |  |
Yizhong [Member] |  |  |  |  |  |  |  |  |
Loans from a Third Party [Line Items] |  |  |  |  |  |  |  |  |
Outstanding balances | $ 14.6 | $ 13.4 |  |  |  |  |  |  |
Debt obligation |  |  | 8.5 |  |  |  |  |  | ¥ 60.0
Interest expense |  | $ 1.7 | $ 3.6 |  |  |  |  |  |

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