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Summary of Significant Accounting Policies - Concentration of credit risk (Details) $ in Thousands | Dec. 31, 2024 USD ($) item | Dec. 31, 2023 USD ($) item
--- | --- | ---
Concentration of credit risk |  |
Advances to suppliers | $ 124,440 | $ 193,818
Supplier |  |
Concentration of credit risk |  |
Number of major suppliers | item | 3 | 0
Supplier | Supplier one |  |
Concentration of credit risk |  |
Advances to suppliers | $ 46,486 |
Supplier | Supplier two |  |
Concentration of credit risk |  |
Advances to suppliers | 33,855 |
Supplier | Supplier three |  |
Concentration of credit risk |  |
Advances to suppliers | $ 24,764 |

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