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Prepayments and Other Current Assets
 12 Months Ended
Dec. 31, 2022
Prepaid Expense and Other Assets, Current [Abstract]  
Prepayments and Other Current Assets
 
7.
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
 
    
 
 
     
 
 
     
 
 
  
As of December 31, 2021 and 2022, the Group recorded the allowance for doubtful accounts of RMB1,537 and RMB1,655 (US$240
)
, respectively.