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ACCOUNTS RECEIVABLE, NET | 6 Months Ended
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Jun. 30, 2021
ACCOUNTS RECEIVABLE, NET |
ACCOUNTS RECEIVABLE, NET | 6. ACCOUNTS RECEIVABLE, NET Accounts receivable consisted of the following: ​
​ | ​ | ​ | ​ | ​
​ |  | As of
​ |  | June 30, 2021 |  | December 31, 2020
​ |  | RMB |  | RMB
​ | ​ | Unaudited | ​ | ​
Accounts receivable | ​ | 28,447 | ​ | 27,219
Less: Allowance for doubtful accounts |  | (7,213) |  | (6,247)
Accounts receivable, net |  | 21,234 |  | 20,972
​ Allowance for doubtful accounts: ​
​ | ​ | ​ | ​ | ​
​ |  | As of
​ |  | June 30, 2021 |  | December 31, 2020
​ |  | RMB |  | RMB
​ | ​ | Unaudited | ​ | ​
Balance at beginning of year/period | ​ | (6,247) | ​ | (2,993)
Addition |  | (2,002) |  | (7,857)
Written off |  | 1,036 |  | 4,603
Balance at end of year/period |  | (7,213) |  | (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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Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
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