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Accounts Receivable, Net (Tables) | 9 Months Ended
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Sep. 30, 2020
Receivables, Net, Current [Abstract] |
Schedule of accounts receivable | The following is a summary of accounts receivable as of December 31, 2019 and September 30, 2020:
|  | As of |
|  | December 31, |  |  | September 30, |
|  | 2019 |  |  | 2020 |
|  | RMB |  |  | RMB |
Accounts receivable, net: |  |  |  |  |  |  |  |
Accounts receivable |  |  | 202,953 |  |  |  | 346,326 |
Allowance for doubtful accounts /expected credit losses: |  |  |  |  |  |  |  |
Balance at the beginning of year |  |  | (799 | ) |  |  | (2,278 | )
Additional provision charged to expenses |  |  | (1,897 | ) |  |  | (9,719 | )
Write-off |  |  | 418 |  |  |  | — |
Balance at the end of year/period |  |  | (2,278 | ) |  |  | (11,997 | )
|  |  | 200,675 |  |  |  | 334,329 |

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