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Accounts and notes receivable, net
 6 Months Ended
Jun. 30, 2021
Receivables [Abstract]  
Accounts receivable, net
3 Accounts and notes receivable, net
 
     As of  
     December 31,
2020		      June 30, 2021  
     RMB      RMB      US$  
Accounts and notes receivable
      88,706        77,560        12,012  
Less: allowance for doubtful accounts
      (43,820 )       (39,420 )       (6,105 ) 
    
 
 
     
 
 
     
 
 
  
Total accounts and notes receivable, net
      44,886        38,140        5,907  
    
 
 
     
 
 
     
 
 
  
The following table presents the movement in the allowance for doubtful accounts:
 
     As of  
     December 31,
2020		      June 30, 2021  
     RMB      RMB      US$  
Balance at beginning of the period
      28,516        43,820        6,787  
Provisions
      18,732        221        34  
Write-offs
      (3,428 )       (4,621 )       (716 ) 
    
 
 
     
 
 
     
 
 
  
Balance at end of the period
      43,820        39,420        6,105