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Segment information (Details 2)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Supplier A
Supplier accounting for more than 5% of Group's purchases	30%	53%	55%
Supplier B
Supplier accounting for more than 5% of Group's purchases	12%	0%	0%
Supplier C
Supplier accounting for more than 5% of Group's purchases	10%	7%	8%
Supplier D
Supplier accounting for more than 5% of Group's purchases	9%	6%	7%
Supplier E
Supplier accounting for more than 5% of Group's purchases	6%	6%	7%
Supplier F
Supplier accounting for more than 5% of Group's purchases	5%	0%	0%

X

- 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
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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-Publisher FASB
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-URI http://asc.fasb.org/extlink&oid=99380358&loc=d3e7102-108593

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-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6327-108592

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