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Significant Accounting Policies - Concentrations and Risks (Details) | 12 Months Ended
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Dec. 31, 2020 item customer | Dec. 31, 2019 item customer | Dec. 31, 2018 | Dec. 31, 2017 item
Total number of online advertising and promotional service providers | 41 | 25 |  | 32
Number of online service providers that accounted for 10% or more of the Group's online advertising and promotional service | 2 | 2 |  | 2
Total percentage of the Group's online advertising and promotional service expenses that were paid to these service providers who accounted for 10% or more of the Group's online advertising and promotional service expenses. | 43.00% | 55.00% |  | 43.00%
Credit Concentration Risk [Member] | Accounts Receivable [Member] |  |  |  |
Number of customers | customer | 0 | 0 |  |
Credit Concentration Risk [Member] | Accounts Receivable [Member] | Customer A [Member] |  |  |  |
Concentration risk (as a percent) | 10.00% | 10.00% | 10.00% |

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- Definition Information about total number of online service providers that accounted for 10% or more of the Group's online advertising and promotional service. + References No definition available. + Details
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- Definition Represents information about total percentage of the Group's online advertising and promotional service expenses that were paid to these service providers who accounted for 10% or more of the Group's online advertising and promotional service expenses. + References No definition available. + Details
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