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Convertible Notes (Tables)
 12 Months Ended
Dec. 31, 2021
Debt Disclosure [Abstract]  
Summary of Principal Amount, Debt Issuance Costs and Derivative Liability
The principal amount, contingent redemption feature, contingent interest feature and debt issuance costs as of December 31, 2021 were as follows:
 
     As of
December 31,
2020		     Charge to
profit and
loss		      Redemption     Foreign
currency
translation
adjustment		      As of December 31, 2021  
     RMB     RMB      RMB     RMB      RMB      US$  
Principal amount
      228,372       —          (228,508 )      136        —          —    
    
 
 
    
 
 
     
 
 
    
 
 
     
 
 
     
 
 
  
Contingent redemption feature, contingent interest feature and debt issuance costs
      (3,143 )      3,108        —         35        —          —    
    
 
 
    
 
 
     
 
 
    
 
 
     
 
 
     
 
 
  
Total
      225,229       3,108        (228,508 )      171        —          —