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Intangible assets (Details) ¥ in Thousands	12 Months Ended
	Dec. 31, 2020 CNY (¥)
Finite-Lived Intangible Assets [Line Items]
Total Intangible assets	¥ 25,955
Intangible assets, net	21,821
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Total Intangible assets	3,300
accumulated amortization	¥ (1,100)
Useful life of intangible assets	3 years
Trade names
Finite-Lived Intangible Assets [Line Items]
Total Intangible assets	¥ 4,822
accumulated amortization	¥ (487)
Useful life of intangible assets	10 years
Technologies
Finite-Lived Intangible Assets [Line Items]
Total Intangible assets	¥ 17,833
accumulated amortization	¥ (2,547)
Useful life of intangible assets	7 years
Minimum
Finite-Lived Intangible Assets [Line Items]
Useful life of intangible assets	3 years
Maximum
Finite-Lived Intangible Assets [Line Items]
Useful life of intangible assets	10 years

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- Definition

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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- Definition

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 928
-SubTopic 340
-Section 50
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- Definition

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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