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Significant Accounting Policies - Summary of Advertising and Promotional Service Providers (Details) - Advertising and promotional service expense - item
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Advertising and promotional service providers      
Number of service providers that accounted for 10% or more of the Group's advertising and promotional expenses 182 198 203
Supplier concentration risk      
Advertising and promotional service providers      
Number of service providers that accounted for 10% or more of the Group's advertising and promotional expenses 2 2 3
Customer concentration risk | Major customers for advertising business      
Advertising and promotional service providers      
Total percentage of the Group's advertising and promotional expenses that were paid to these service providers who accounted for 10% or more of the Group's advertising and promotional service expenses 35.70% 44.90% 38.10%