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Accounts receivable, net
 12 Months Ended
Dec. 31, 2022
Receivables [Abstract]  
Accounts receivable, net
3
Accounts receivable, net

     As of December 31,  
     2021      2022  
     RMB      RMB      US$  
Accounts receivable
      81,550        34,869        5,056  
Less: allowance for doubtful accounts
      (37,690 )       (5,142 )       (746 ) 
    
 
 
     
 
 
     
 
 
  
Total accounts receivable, net
      43,860        29,727        4,310  
    
 
 
     
 
 
     
 
 
  
The following table presents the movement in the allowance for doubtful accounts:
 
     As of December 31,  
     2021      2022  
     RMB      RMB      US$  
Balance at beginning of year
      43,820        37,690        5,465  
(Reversals)/provisions
      (246 )       2,089        303  
Write-offs
      (5,884 )       (34,637 )       (5,022 ) 
    
 
 
     
 
 
     
 
 
  
Balance at end of year
      37,690        5,142        746