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Accounts receivable, net (Tables) | 12 Months Ended
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Dec. 31, 2018
Accounts Receivable, Net [Abstract] |
Schedule of accounts receivable |
|  | 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 |
Schedule of allowance for doubtful accounts |
|  | 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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- Definition Tabular disclosure of the various types of trade accounts and notes receivable and for each the gross carrying value, allowance, and net carrying value as of the balance sheet date. Presentation is categorized by current, noncurrent and unclassified receivables. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3,4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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