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Summary of significant accounting policies - Schedule of Property and Equipment Estimated Useful Life (Details)
12 Months Ended
Dec. 31, 2021
Servers and network equipment  
Property, Plant and Equipment [Line Items]  
Residual rate 5.00%
Servers and network equipment | Minimum  
Property, Plant and Equipment [Line Items]  
Estimated useful lives 3 years
Servers and network equipment | Maximum [Member]  
Property, Plant and Equipment [Line Items]  
Estimated useful lives 5 years
Computer equipment  
Property, Plant and Equipment [Line Items]  
Estimated useful lives 5 years
Residual rate 5.00%
Furniture, fixtures and office equipment  
Property, Plant and Equipment [Line Items]  
Residual rate 5.00%
Furniture, fixtures and office equipment | Minimum  
Property, Plant and Equipment [Line Items]  
Estimated useful lives 3 years
Furniture, fixtures and office equipment | Maximum [Member]  
Property, Plant and Equipment [Line Items]  
Estimated useful lives 5 years
Motor vehicles  
Property, Plant and Equipment [Line Items]  
Estimated useful lives 5 years
Residual rate 5.00%
Leasehold improvements  
Property, Plant and Equipment [Line Items]  
Estimated useful lives 3 years