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Principal accounting policies - Schedule of Property and Equipment Estimated Useful Lives and Residual Rate (Details)
Dec. 31, 2025
Servers, computers and equipment | Minimum  
Property, Plant and Equipment  
Estimated useful lives 3 years
Servers, computers and equipment | Maximum  
Property, Plant and Equipment  
Estimated useful lives 4 years
Leasehold improvements  
Property, Plant and Equipment  
Estimated useful lives us-gaap:UsefulLifeShorterOfTermOfLeaseOrAssetUtilityMember
Office furniture and others | Minimum  
Property, Plant and Equipment  
Estimated useful lives 3 years
Office furniture and others | Maximum  
Property, Plant and Equipment  
Estimated useful lives 5 years
Residual rate 5.00%