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Significant Accounting Policies - Revenue Recognition (Details) ¥ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2020 CNY (¥) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 CNY (¥) | Dec. 31, 2018 CNY (¥)
Significant Accounting Policies |  |  |  |
Practical expedient related to performance obligations | true | true |  |
Deferred revenue, revenue recognized | ¥ 1,238,800 |  | ¥ 943,400 | ¥ 571,400
Total net revenues | 11,998,976 | $ 1,838,924 | 6,777,922 | 4,128,931
Mobile game |  |  |  |
Significant Accounting Policies |  |  |  |
Total net revenues | 4,803,382 |  | 3,597,809 | 2,936,331
Value-added services (formerly known as Live broadcasting and VAS) |  |  |  |
Significant Accounting Policies |  |  |  |
Total net revenues | 3,845,663 |  | 1,641,043 | 585,643
Advertising |  |  |  |
Significant Accounting Policies |  |  |  |
Total net revenues | 1,842,772 |  | 817,016 | 463,490
E-commerce and others |  |  |  |
Significant Accounting Policies |  |  |  |
Total net revenues | ¥ 1,507,159 |  | ¥ 722,054 | ¥ 143,467
Maximum | Live broadcasting and other VAS |  |  |  |
Significant Accounting Policies |  |  |  |
Period recognized for time-based virtual item | 1 year | 1 year |  |

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