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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

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