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ACCOUNTS RECEIVABLE, NET | 12 Months Ended
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Dec. 31, 2020
ACCOUNTS RECEIVABLE, NET |
ACCOUNTS RECEIVABLE, NET | 6. ACCOUNTS RECEIVABLE, NET Accounts receivable consisted of the following:
|  | As of December 31,
|  | 2019 |  | 2020
|  | RMB |  | RMB
Accounts receivable |  | 20,932 |  | 27,219
Less: Allowance for doubtful accounts |  | (2,993) |  | (6,247)
Accounts receivable, net |  | 17,939 |  | 20,972
Allowance for doubtful accounts:
|  | As of December 31,
|  | 2019 |  | 2020
|  | RMB |  | RMB
Balance at beginning of year |  | (3,535) |  | (2,993)
Addition |  | (3,220) |  | (7,857)
Written off |  | 3,762 |  | 4,603
Balance at end of year |  | (2,993) |  | (6,247)

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- Definition The entire disclosure for financing receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -URI http://asc.fasb.org/subtopic&trid=2196772 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 20 -URI http://asc.fasb.org/subtopic&trid=2196816 + Details
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- References No definition available. + Details
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