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Property and equipment, net - Schedule of property and equipment (Details)
¥ in Thousands, $ in Thousands
Jun. 30, 2024
CNY (¥)
Jun. 30, 2024
USD ($)
Dec. 31, 2023
CNY (¥)
Property and equipment, net      
Property and equipment ¥ 319,283   ¥ 276,730
Less: accumulated depreciation (175,130)   (148,653)
Less: impairment (6,894)   (7,292)
Property and equipment, net 137,259 $ 18,887 120,785
Machinery and electronic equipment      
Property and equipment, net      
Property and equipment 219,956   197,777
Transportation vehicles      
Property and equipment, net      
Property and equipment 4,990   5,654
Office and other equipment      
Property and equipment, net      
Property and equipment 21,399   20,614
Leasehold improvements      
Property and equipment, net      
Property and equipment 57,317   44,747
Construction in progress      
Property and equipment, net      
Property and equipment ¥ 15,621   ¥ 7,938