v3.22.2.2
Accounts receivable, net (Tables)
 6 Months Ended
Jun. 30, 2022
Receivables [Abstract]  
Schedule of Accounts Receivable
     As of  
     December 31, 2021      June 30, 2022  
     RMB      RMB      US$  
Accounts receivable
      81,550        61,728        9,216  
Less: allowance for doubtful accounts
      (37,690 )       (26,590 )       (3,970 ) 
    
 
 
     
 
 
     
 
 
  
Total accounts receivable, net
      43,860        35,138        5,246  
    
 
 
     
 
 
     
 
 
  
Schedule of Movement in Allowance for Doubtful Accounts
The following table presents the movement in the allowance for doubtful accounts:
 
     As of  
     December 31, 2021      June 30, 2022  
     RMB      RMB      US$  
Balance at beginning of the period
      43,820        37,690        5,627  
Provisions/(reversals)
      (246 )       1,669        249  
Write-offs
      (5,884 )       (12,769 )       (1,906 ) 
    
 
 
     
 
 
     
 
 
  
Balance at end of the period
      37,690        26,590        3,970