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Goodwill (Tables) | 12 Months Ended
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Dec. 31, 2019
Goodwill And Intangible Assets Disclosure [Abstract] |
Changes in carrying amount of goodwill | The changes in the carrying amount of goodwill are follows:
|  | Yitian Xindong Business |  |  | Tianbo Business |  |  | Total |
|  | RMB |  |  | RMB |  |  | RMB |
Balance as of December 31, 2017 |  |  | — |  |  |  | — |  |  |  | — |
Goodwill acquired |  |  | 338,288 |  |  |  | — |  |  |  | 338,288 |
Balance as of December 31, 2018 |  |  | 338,288 |  |  |  | — |  |  |  | 338,288 |
Goodwill acquired |  |  | — |  |  |  | 22,786 |  |  |  | 22,786 |
Balance as of December 31, 2019 |  |  | 338,288 |  |  |  | 22,786 |  |  |  | 361,074 |

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