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SUMMARY OF PRINCIPAL ACCOUNTING POLICIES - Concentration of credit risk (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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Concentration of credit risk |  |
Advances to suppliers | $ 193,818 | $ 253,484
Supplier | Supplier A |  |
Concentration of credit risk |  |
Advances to suppliers |  | $ 35,359

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