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Loan Payables (Tables)
12 Months Ended
Dec. 31, 2022
Loans Payables [Abstract]  
Schedule of Loan Payables Loan payables were as follows as of the respective balance sheet dates:
   As of December 31, 
   2021   2022 
   RMB   RMB   US$ 
Loan payables, current portion   500    6,500    942 
Loan payables, non-current portion   6,500    
-
    
-
 
    7,000    6,500    942