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Segment information (Details 2) | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Supplier G |  |  |
Supplier accounting for more than 5% of Group's purchases | 5 | 0 | 0
Supplier H |  |  |
Supplier accounting for more than 5% of Group's purchases | 0 | 0 | 12
Supplier A |  |  |
Supplier accounting for more than 5% of Group's purchases | 33 | 42 | 30
Supplier B |  |  |
Supplier accounting for more than 5% of Group's purchases | 21 | 13 | 10
Supplier C |  |  |
Supplier accounting for more than 5% of Group's purchases | 6 | 6 | 9
Supplier D |  |  |
Supplier accounting for more than 5% of Group's purchases | 5 | 6 | 6
Supplier E |  |  |
Supplier accounting for more than 5% of Group's purchases | 0 | 5 | 5
Supplier F |  |  |
Supplier accounting for more than 5% of Group's purchases | 5 | 0 | 0

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