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Bank Borrowings (Tables)
6 Months Ended
Jun. 30, 2024
Bank Borrowings [Abstract]  
Schedule of Bank Borrowings Bank borrowings were as follows as of the respective balance sheet dates:
   December 31, 2023   June 30, 2024 
   RMB   RMB   US$ 
       (Unaudited) 
Short-term bank borrowing   5,000    5,000    688 
Long-term bank borrowing, current portion   9,500    9,000    1,238 
    14,500    14,000    1,926