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Advance to Suppliers (Tables)
 6 Months Ended
Jun. 30, 2024
Advance to Suppliers [Abstract]  
Schedule of Advance to Suppliers Advance to suppliers consisted of the following:
   December 31, 2023   June 30, 2024 
   RMB   RMB   US$ 
       (Unaudited） 
Advance to suppliers   19,288    19,327    2,659 
Less: allowance for expected credit losses   (8,472)   (8,076)   (1,111)
    10,816    11,251    1,548 

 
Schedule of Allowance for Doubtful Accounts An analysis of the expected credit losses was as follows:
   December 31, 2023   June 30, 2024 
   RMB   RMB   US$ 
       (Unaudited） 
Balance at beginning of the period   (8,366)   (8,472)   (1,166)
Additional (allowance)/reversal for expected credit losses   (106)   396    55 
Balance at the end of the period   (8,472)   (8,076)   (1,111)