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Principal Accounting Policies - Intangible assets, net (Details)	12 Months Ended
	Dec. 31, 2019
Computer software
Intangible assets
Estimated useful lives	5 years
Trademark and domain names
Intangible assets
Estimated useful lives	10 years
Licensed copyrights of reading content
Intangible assets
Estimated useful lives	5 years
Audio content
Intangible assets
Estimated useful lives	5 years
User base
Intangible assets
Estimated useful lives	9 months 18 days

X

- 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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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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- Details

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- Details

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- Details

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- Details

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- Details

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