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Segment information (Details 2) | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Supplier A |  |  |
Supplier accounting for more than 5% of Group's purchases | 36 | 23 | 21
Supplier B |  |  |
Supplier accounting for more than 5% of Group's purchases | 26 | 42 | 33
Supplier C |  |  |
Supplier accounting for more than 5% of Group's purchases | 8 | 7 | 6
Supplier D |  |  |
Supplier accounting for more than 5% of Group's purchases | 5 | 5 | 5
Supplier E |  |  |
Supplier accounting for more than 5% of Group's purchases | 0 | 0 | 5
Supplier F |  |  |
Supplier accounting for more than 5% of Group's purchases | 0 | 0 | 5

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