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Accounts Receivable, Net | 12 Months Ended
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Dec. 31, 2021
Receivables [Abstract] |
Accounts Receivable, Net |
4. | ACCOUNTS RECEIVABLE, NET
Accounts receivable and the related allowance for doubtful accounts are summarized as follows:
|  | As of December 31, |
|  | 2020 |  |  | 2021 |
|  | RMB |  |  | RMB |  |  | US$ |
Accounts receivable |  |  | 141,594,170 |  |  |  | 223,544,396 |  |  |  | 35,078,994 |
Less: Allowance for doubtful accounts |  |  | — |  |  |  | — |  |  |  | — |
Accounts receivable, net |  |  | 141,594,170 |  |  |  | 223,544,396 |  |  |  | 35,078,994 |
No amounts have been written off during the years ended December 31, 2019, 2020 and 2021, respectively.

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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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- References No definition available. + Details
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