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Accounts receivable, net | 12 Months Ended
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Dec. 31, 2018
Accounts Receivable, Net [Abstract] |
Accounts receivable, net |
4. | Accounts receivable, net
Accounts receivable, net is consisted of the following:
|  | December 31, 2017 |  |  | December 31, 2018 |
|  | RMB |  |  | RMB |
Accounts receivable, gross: |  |  | 8,885 |  |  |  | 52,746 |
Less: allowance for doubtful accounts |  |  | (418 | ) |  |  | (491 | )
Accounts receivable, net |  |  | 8,467 |  |  |  | 52,255 |
The Group closely monitors the collection of its accounts receivable and records allowance for doubtful accounts against aged accounts receivable and for specifically identified non-recoverable amounts. If the economic situation and the financial condition of a customer deteriorate resulting in an impairment of the customer's ability to make payments, additional allowances might be required. Receivable balance are written off when they are determined to be uncollectable. The following table sets out movements of the allowance for doubtful accounts for the years ended December 31, 2016, 2017 and 2018:
|  | December 31, 2016 |  |  | December 31, 2017 |  |  | December 31, 2018 |
|  |  | RMB |  |  |  | RMB |  |  |  | RMB |
Balance at the beginning of the period |  |  | - |  |  |  | - |  |  |  | 418 |
Additions charged to bad debt expense |  |  | - |  |  |  | 418 |  |  |  | 491 |
Write-off of bad debt allowance |  |  | - |  |  |  | - |  |  |  | (418 | )
Balance at the end of the period |  |  | - |  |  |  | 418 |  |  |  | 491 |

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