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Significant Accounting Policies - Intangible assets (Details)	12 Months Ended
	Dec. 31, 2020
Minimum | Licensed copyrights of content
Finite-lived intangible assets, property plant and equipment [Line Items]
Estimated useful lives of intangible assets	1 year
Minimum | License rights of mobile games
Finite-lived intangible assets, property plant and equipment [Line Items]
Estimated useful lives of intangible assets	1 year
Minimum | Intellectual property and others
Finite-lived intangible assets, property plant and equipment [Line Items]
Estimated useful lives of intangible assets	1 year
Maximum | Licensed copyrights of content
Finite-lived intangible assets, property plant and equipment [Line Items]
Estimated useful lives of intangible assets	8 years
Maximum | License rights of mobile games
Finite-lived intangible assets, property plant and equipment [Line Items]
Estimated useful lives of intangible assets	3 years
Maximum | Intellectual property and others
Finite-lived intangible assets, property plant and equipment [Line Items]
Estimated useful lives of intangible assets	10 years

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Definition

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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- Details

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- Details

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