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Prepayments and Other Current Assets (Tables)
12 Months Ended
Dec. 31, 2022
Prepaid Expense and Other Assets, Current [Abstract]  
Summary of Prepayments and Other Current Assets
Prepayments and other current assets consisted of the following:
 
    
As of December 31,
 
    
2021
    
2022
 
    
RMB
    
RMB
    
US$
 
Prepayment for service
     1,672        11,157        1,618  
Unbilled revenue (Note 15)
     —          10,800        1,566  
Deductible value-added tax input
     16,487        8,976        1,301  
Prepayment for acquisition of inventories
     8,286        6,910        1,002  
Loans receivable – current portion (Note 9)
     —          4,000        580  
Staff advances
     1,257        940        136  
Others
     1,693        2,400        347  
    
 
 
    
 
 
    
 
 
 
    
 
29,395
 
  
 
45,183
 
  
 
6,550