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Bank Borrowings (Tables)
6 Months Ended
Jun. 30, 2023
Bank Borrowings [Abstract]  
Schedule of Bank Borrowings Bank borrowings were as follows as of the respective balance sheet dates:
   December 31   June 30 
   2022   2023 
   RMB   RMB   US$ 
Long-term bank borrowing, current portion   
-
    
-
    
-
 
Long-term bank borrowing, non-current portion   10,000    10,000    1,379 
    10,000    10,000    1,379