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Accounts Receivable, Net (Tables)
 9 Months Ended
Sep. 30, 2020
Receivables, Net, Current [Abstract]  
Schedule of accounts receivable
The following is a summary of accounts receivable as of December 31, 2019 and September 30, 2020:
 
    
As of
  
    
December 31,
     
September 30,
  
    
2019
     
2020
  
    
RMB
     
RMB
  
Accounts receivable, net:
                  
Accounts receivable
      202,953        346,326  
Allowance for doubtful accounts
/expected credit
 losses:
                  
Balance at the beginning of year
      (799 )       (2,278 ) 
Additional provision charged to expenses
      (1,897 )       (9,719 ) 
Write-off
      418        —    
Balance at the end of year/period
      (2,278 )       (11,997 ) 
    
 
 
     
 
 
  
    
 
200,675
 
   
 
334,329