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Accounts Receivable, Net
 12 Months Ended
Dec. 31, 2023
Accounts Receivable, Net [Abstract]  
ACCOUNTS RECEIVABLE, NET

4. ACCOUNTS RECEIVABLE, NET

 

Accounts receivable consisted of the following:

 

   As of 
   December 31,   December 31, 
   2022   2023 
   RMB   RMB   US$ 
Accounts receivable   32,098,662    51,478,092    7,268,146 
Allowance for credit losses related to accounts receivable   (1,185,328)   (10,196,104)   (1,439,579)
Total accounts receivable, net   30,913,334    41,281,988    5,828,567 

 

The movement of allowance of doubtful accounts is as follows:

 

   As of 
   December 31,   December 31, 
   2022   2023 
   RMB   RMB   US$ 
Beginning balance   682,905    1,185,328    167,355 
Addition   700,505    9,745,364    1,375,938 
Write off   (198,082)   (406,566)   (57,402)
Reverse   
-
    (328,022)   (46,312)
Ending balance   1,185,328    10,196,104    1,439,579 

 

The Group recorded bad debt expenses (net of reversal) of RMB442,706, RMB700,505 and RMB9,417,342 (US$1,329,626) for the years ended December 31, 2021, 2022 and 2023, respectively. The Group had written off nil, RMB198,082 and RMB406,566 (US$57,402) in bad debt for the years ended December 31, 2021, 2022 and 2023, respectively.