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Deferred Revenue and Customer Deposits
 12 Months Ended
Dec. 31, 2021
Revenue Recognition and Deferred Revenue [Abstract]  
Deferred Revenue and Customer Deposits
9
Deferred revenue and customer deposits
Deferred revenue and customer deposits consist of the following:
 
     As of December 31,  
     2020      2021  
     RMB      RMB      US$  
Deferred revenue
      71,141        80,405        12,617  
Customer deposits
      38,041        39,586        6,212  
    
 
 
     
 
 
     
 
 
  
Total deferred revenue and customer deposits – current
      109,182        119,991        18,829  
    
 
 
     
 
 
     
 
 
  
Deferred revenue -
non-current
      6,049        3,845        603  
    
 
 
     
 
 
     
 
 
  
Roll-forward of customer deposits:
 
     Year ended December 31,  
     2020      2021  
     RMB      RMB      US$  
Balance at beginning of year
      37,923        38,041        5,969  
Cash received from customers during the year
      374,811        225,976        35,461  
Revenue recognized during the year
      (363,963 )       (220,333 )       (34,575 ) 
Refunds paid during the year
      (10,730 )       (4,098 )       (643 ) 
    
 
 
     
 
 
     
 
 
  
Balance at end of the year
      38,041        39,586        6,212