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Intangible assets, net - Schedule and narrative (Details) - CNY (¥)
1 Months Ended 12 Months Ended
Nov. 30, 2023
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Intangible assets, net        
Intangible assets   ¥ 268,469,000 ¥ 103,509,000  
Less: accumulated amortization   (86,183,000) (58,648,000)  
Impairment loss   (2,945,000) 0  
Intangible assets, net   ¥ 179,341,000 44,861,000  
Software licensing agreement period 3 years      
Amount of transaction ¥ 50,000,000      
Amortization period   3 years    
Impairment loss   ¥ 2,945,000 0 ¥ 0
Research and development expenses        
Intangible assets, net        
Impairment loss   283,000    
Selling, general and administrative expenses        
Intangible assets, net        
Impairment loss   2,662,000    
Software        
Intangible assets, net        
Intangible assets   121,950,000 103,509,000  
Software license rights        
Intangible assets, net        
Intangible assets   143,725,000 0  
Others        
Intangible assets, net        
Intangible assets   ¥ 2,794,000 ¥ 0