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Segment information (Details 2) | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Supplier G |  |  |
Supplier accounting for more than 5% of Group's purchases | 0% | 5 | 0%
Supplier A |  |  |
Supplier accounting for more than 5% of Group's purchases | 42 | 33 | 42
Supplier B |  |  |
Supplier accounting for more than 5% of Group's purchases | 23 | 21 | 13
Supplier C |  |  |
Supplier accounting for more than 5% of Group's purchases | 7 | 6 | 6
Supplier D |  |  |
Supplier accounting for more than 5% of Group's purchases | 5 | 5 | 6
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% | 5 | 0%

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- Definition Description of risks that arise due to the volume of business transacted with a particular supplier or reliance placed on that supplier. At a minimum, the description informs financial statement users of the general nature of the risk. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482861/275-10-50-20 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 16 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482861/275-10-50-16 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482861/275-10-50-18 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 55 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482836/275-10-55-8 + Details
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