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Segment information (Details 2) | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Supplier A |  |  |
Supplier accounting for more than 5% of Group's purchases | 42 | 30 | 53
Supplier B |  |  |
Supplier accounting for more than 5% of Group's purchases | 13 | 10 | 7
Supplier C |  |  |
Supplier accounting for more than 5% of Group's purchases | 6 | 9 | 6
Supplier D |  |  |
Supplier accounting for more than 5% of Group's purchases | 6 | 6 | 6
Supplier E |  |  |
Supplier accounting for more than 5% of Group's purchases | 5 | 5 | 0
Supplier F |  |  |
Supplier accounting for more than 5% of Group's purchases | 0 | 12 | 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 -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=99380358&loc=d3e7102-108593 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6327-108592 + Details
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