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Concentrations and Risks (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2020
CNY (¥)
item
Dec. 31, 2019
CNY (¥)
item
Dec. 31, 2018
CNY (¥)
item
Dec. 31, 2020
USD ($)
Concentrations and Risks        
Accounts receivable, net ¥ 1,053,641 ¥ 744,845 ¥ 324,392 $ 161,478
Telecommunications service provider        
Concentrations and Risks        
Total number of telecommunications service providers 116 107 88  
Telecommunications service provider | Servers and bandwidth expenditure        
Concentrations and Risks        
Number of service providers providing 10% or more of the Group's servers and bandwidth expenditure 3 2 3  
Concentration risk percentage 55.00% 45.00% 48.00%  
Credit risk | Accounts receivable | Distribution channel A        
Concentrations and Risks        
Number of distribution channels with receivable balance exceeding 10% of the Group's accounts receivable 1 1 1  
Accounts receivable, net | ¥ ¥ 146,907 ¥ 118,860 ¥ 63,762  
Distribution channel risk | Net revenues | Distribution channel        
Concentrations and Risks        
Concentration risk percentage 11.00% 17.00% 29.00%  
Mobile games | Mobile game | Net revenues        
Concentrations and Risks        
Concentration risk percentage 40.00% 53.00% 71.00%  
Mobile games | Mobile game 1 | Mobile game revenues        
Concentrations and Risks        
Concentration risk percentage 11.00% 31.00% 53.00%