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Significant Accounting Policies - Concentrations and Risks (Details)	12 Months Ended
	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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Number of customers exceeding the threshold concentration risk percentage.

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Information about total number of online service providers that accounted for 10% or more of the Group's online advertising and promotional service.

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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.

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

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-Publisher FASB
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