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Accounts receivable, net | 12 Months Ended
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Dec. 31, 2020
Accounts receivable, net |
Accounts receivable, net | 4. Accounts receivable, net Accounts and notes receivables are consisted of the following:
|  | December 31, 2019 |  | December 31, 2020
|  | RMB |  | RMB
Notes receivable |  | 12,209 |  | 5,235
Accounts receivable, gross |  | 74,357 |  | 84,189
Less: allowance for doubtful accounts |  | (14,175) |  | (23,298)
Accounts receivable, net |  | 72,391 |  | 66,126
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. Notes receivable were RMB12.2 million and RMB5.2 million for the years ended December 31, 2019 and 2020, respectively. 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, 2018, 2019 and 2020:
|  | December 31, 2018 |  | December 31, 2019 |  | December 31, 2020
|  | RMB |  | RMB |  | RMB
Balance at the beginning of the year |  | 418 |  | 491 |  | 14,175
Additions charged to bad debt expense |  | 491 |  | 13,684 |  | 13,654
Write-off of bad debt allowance |  | (418) |  | — |  | (4,531)
Balance at the end of the year |  | 491 |  | 14,175 |  | 23,298

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- Definition The entire disclosure for claims held for amounts due a entity, excluding financing receivables. Examples include, but are not limited to, trade accounts receivables, notes receivables, loans receivables. Includes disclosure for allowance for credit losses. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -URI http://asc.fasb.org/subtopic&trid=2196772 + Details
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