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Property and equipment, net (Details) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Property, Plant and Equipment [Line Items]      
Property and equipment, Gross ¥ 327,483 ¥ 308,656  
Accumulated depreciation (182,195) (141,916)  
Net book value 145,288 166,740  
Depreciation 64,610 67,875 ¥ 46,638
Machinery      
Property, Plant and Equipment [Line Items]      
Property and equipment, Gross 130,786 130,866  
Leasehold improvement      
Property, Plant and Equipment [Line Items]      
Property and equipment, Gross 88,209 92,340  
Computer equipment      
Property, Plant and Equipment [Line Items]      
Property and equipment, Gross 39,536 41,422  
Furniture and office equipment      
Property, Plant and Equipment [Line Items]      
Property and equipment, Gross 26,572 28,123  
Vehicles      
Property, Plant and Equipment [Line Items]      
Property and equipment, Gross 11,371 13,128  
Construction in process      
Property, Plant and Equipment [Line Items]      
Property and equipment, Gross ¥ 31,009 ¥ 2,777