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Segment information (Details 3) | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Customer D |  |  |
Customers accounting for more than 5% of the Group's revenue | 5 | 0 | 0
Customer E |  |  |
Customers accounting for more than 5% of the Group's revenue | 5 | 6 | 0
Customer C |  |  |
Customers accounting for more than 5% of the Group's revenue | 7 | 0 | 0
Customer B |  |  |
Customers accounting for more than 5% of the Group's revenue | 10 | 9 | 0
Customer A |  |  |
Customers accounting for more than 5% of the Group's revenue | 14 | 18 | 15
Customer F |  |  |
Customers accounting for more than 5% of the Group's revenue | 0 | 0 | 17
Customer G |  |  |
Customers accounting for more than 5% of the Group's revenue | 0 | 0 | 9
Customer H |  |  |
Customers accounting for more than 5% of the Group's revenue | 0 | 0 | 7

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- Definition Description of risks that arise due to the volume of business transacted with a particular customer. At a minimum, the description informs financial statement users of the general nature of the risk, but excludes "Information about Major Customers" that may be disclosed elsewhere (for instance, segment disclosures). + 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 + Details
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