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Accounts Receivables (Tables) | 12 Months Ended
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Dec. 31, 2024
Accounts Receivables |
Schedule of accounts receivables | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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
Schedule of movements of allowance for accounts receivables | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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 Tabular disclosure of allowance for credit loss on accounts receivable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 + Details
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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 -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(4)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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