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Property and equipment, net (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2022
CNY (¥)
Dec. 31, 2021
CNY (¥)
Dec. 31, 2020
CNY (¥)
Dec. 31, 2022
USD ($)
Property and equipment, net        
Total ¥ 63,462 ¥ 66,411    
Accumulated depreciation (50,884) (52,597)    
Impairment   (1,197)    
Property and equipment, net 12,578 12,617   $ 1,824
Impairment loss 0 0 ¥ 0  
Depreciation expenses 1,800 7,493 ¥ 14,425  
Office furniture and equipment        
Property and equipment, net        
Total 1,886 1,984    
Computer equipment        
Property and equipment, net        
Total 6,993 9,243    
Servers and network equipment        
Property and equipment, net        
Total 31,591 31,977    
Leasehold improvements        
Property and equipment, net        
Total 10,423 10,010    
Vehicles        
Property and equipment, net        
Total 57 685    
Building        
Property and equipment, net        
Total ¥ 12,512 ¥ 12,512