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Accounts Receivable, Net
12 Months Ended
Dec. 31, 2022
Accounts Receivable, after Allowance for Credit Loss, Current [Abstract]  
Accounts Receivable, Net
 
5.
Accounts Receivable, Net
Accounts receivable, net, consisted of the following:
 
    
As of December 31,
 
    
2021
    
2022
 
    
RMB
    
RMB
    
US$
 
Accounts receivable
     125,606        135,678        19,671  
Allowance for doubtful accounts
     (69,417      (115,380      (16,728
    
 
 
    
 
 
    
 
 
 
    
 
56,189
 
  
 
20,298
 
  
 
2,943
 
    
 
 
    
 
 
    
 
 
 
The movements in the allowance for doubtful accounts were:
 
    
For the year ended December 31,
 
    
2020
    
2021
    
2022
 
    
RMB
    
RMB
    
RMB
   
US$
 
Balance at the beginning of the year
     (862      (10,051      (69,417     (10,064
Additional provision charged to expense
     (9,217      (59,347      (46,045     (6,676
Foreign currency translation
     28        (19      82       12  
    
 
 
    
 
 
    
 
 
   
 
 
 
Balance at the end of the year
  
 
(10,051
  
 
(69,417
  
 
(115,380
 
 
(16,728