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Significant Accounting Policies - Summary of Advertising and Promotional Service Providers (Details) - Advertising and promotional service expense - item | 12 Months Ended
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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%

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