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Intangible assets, net - Schedule of Weighted Average Amortization Periods of Intangible Assets (Details) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items] |  |
Weighted average amortization periods of intangible assets | 10 years | 12 years
Land use right [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted average amortization periods of intangible assets | 30 years | 30 years
Acquired computer software [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted average amortization periods of intangible assets | 5 years | 5 years
Online game licenses [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted average amortization periods of intangible assets | 0 years | 3 years
Audio visual licenses [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted average amortization periods of intangible assets | 9 years | 9 years

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- Definition Weighted average period before the next renewal or extension (both explicit and implicit) for intangible assets that have been renewed or extended, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- 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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |