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Intangible assets, net - Schedule of Weighted Average Amortization Periods of Intangible Assets (Details)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]    
Weighted average amortization periods of intangible assets 10 years 12 years
Land use right [Member]    
Finite-Lived Intangible Assets [Line Items]    
Weighted average amortization periods of intangible assets 30 years 30 years
Acquired computer software [Member]    
Finite-Lived Intangible Assets [Line Items]    
Weighted average amortization periods of intangible assets 5 years 5 years
Online game licenses [Member]    
Finite-Lived Intangible Assets [Line Items]    
Weighted average amortization periods of intangible assets 0 years 3 years
Audio visual licenses [Member]    
Finite-Lived Intangible Assets [Line Items]    
Weighted average amortization periods of intangible assets 9 years 9 years