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Accounts Receivables | 12 Months Ended
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Dec. 31, 2024
Accounts Receivables |
Accounts Receivables | 4. Accounts Receivables 4.1 Accounts receivable consist of the following: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As of December 31,
​ |  | 2023 |  | 2024
​ | ​ | RMB | ​ | RMB |  | US$
Accounts receivables |  | 26,082,307 |  | 34,550,465 |  | 4,733,394
Allowance for credit losses |  | (205,489) |  | (274,956) |  | (37,669)
Accounts receivables, net |  | 25,876,818 |  | 34,275,509 |  | 4,695,725
​ 4.2 Movements of allowance for accounts receivable for the years ended December 31,2023 and 2024 are as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As of December 31,
​ | ​ | 2023 | ​ | 2024
​ |  | RMB |  | RMB |  | US$
Balance at the beginning of the year | ​ | — | ​ | 205,489 | ​ | 28,152
Additions |  | 205,489 |  | 69,467 |  | 9,517
Balance at the end of the year |  | 205,489 |  | 274,956 |  | 37,669
​

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- Definition The entire disclosure for claims held for amounts due to 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 -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/310-10/tableOfContent Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 835 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482925/835-30-45-2 + Details
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