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Prepaid Expenses and Other Current Assets (Tables)
12 Months Ended
Dec. 31, 2021
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Schedule of Prepaid Expenses and Other Current Assets
Prepaid expenses and other current assets consist of the following: 
 
 
  
As of December 31,
 
 
  
2020
 
  
2021
 
 
  
RMB
 
  
RMB
 
  
US$
 
Prepayments
     299,154        216,264        33,937  
Rental and other deposits
     10,867        20,371        3,197  
Receivables from third-party payment platform
     86,777        9,899        1,553  
Interest receivable
     114,726        1,495        235  
Staff advances
     2,070        1,395        219  
Other receivables
     49,588        30,824        4,836  
    
 
 
    
 
 
    
 
 
 
 
  
563,182
      280,248       43,977  
    
 
 
    
 
 
    
 
 
 
Prepayments primarily include prepaid VAT and surcharges, prepaid promotional expenses and service fee.