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Property and equipment, net (Tables)
 12 Months Ended
Dec. 31, 2024
Property, Plant and Equipment [Abstract]  
Schedule of property and equipment, net
Property and equipment, net, consisted of the following:
As of December 31,
20232024
RMBRMB
Machinery and electronic equipment 197,777 290,356 
Transportation vehicles 5,654 4,225 
Office and other equipment 20,614 21,613 
Leasehold improvements44,747 54,640 
Construction in progress7,938 14,747 
Property and equipment276,730 385,581 
Less: accumulated depreciation (148,653)(215,021)
Less: impairment(7,292)(10,261)
Property and equipment, net 120,785 160,299 
Schedule of depreciation expenses of property and equipment
Depreciation on property and equipment was allocated as follows:
Year ended December 31,
202220232024
RMBRMBRMB
Cost of revenues 1,022 544 4,454 
Selling, general and administrative expenses 31,931 29,914 18,599 
Research and development expenses 17,574 23,501 33,738 
Total depreciation expenses50,527 53,959 56,791 
Impairment loss on obselete and damaged equipment of property and equiment
Impairment loss on obsolete and damaged equipment of property and equipment was allocated as follows:

Year ended December 31,
202220232024
RMBRMBRMB
Selling, general and administrative expenses— 454 — 
Research and development expenses— 6,838 1,039 
Total impairment loss— 7,292 1,039