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Accounts Receivable (Tables)
 6 Months Ended
Jun. 30, 2024
Accounts Receivable [Abstract]  
Schedule of Accounts Receivable Accounts receivable and the expected credit losses consisted of the following:
   December 31, 2023   June 30, 2024 
   RMB   RMB   US$ 
       (Unaudited） 
Accounts receivable   15,785    18,590    2,558 
Less: allowance for expected credit losses   (37)   (37)   (5)
    15,748    18,553    2,553