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Summary of significant accounting policies - Schedule of Property and Equipment Estimated Useful Life (Details)
12 Months Ended
Dec. 31, 2019
Servers and network equipment [Member]  
Property, Plant and Equipment [Line Items]  
Residual rate 5.00%
Servers and network equipment [Member] | Minimum  
Property, Plant and Equipment [Line Items]  
Estimated useful lives P3Y
Servers and network equipment [Member] | Maximum  
Property, Plant and Equipment [Line Items]  
Estimated useful lives P-5Y
Computer equipment [Member]  
Property, Plant and Equipment [Line Items]  
Estimated useful lives P5Y
Residual rate 5.00%
Furniture, fittings and office equipment [Member]  
Property, Plant and Equipment [Line Items]  
Residual rate 5.00%
Furniture, fittings and office equipment [Member] | Minimum  
Property, Plant and Equipment [Line Items]  
Estimated useful lives P3Y
Furniture, fittings and office equipment [Member] | Maximum  
Property, Plant and Equipment [Line Items]  
Estimated useful lives P-5Y
Motor vehicles [Member]  
Property, Plant and Equipment [Line Items]  
Estimated useful lives P5Y
Residual rate 5.00%
Leasehold improvements [Member]  
Property, Plant and Equipment [Line Items]  
Estimated useful lives Shorter of lease term or 3 years