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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