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Redeemable Noncontrolling Interests (Tables)
12 Months Ended
Dec. 31, 2021
Noncontrolling Interest [Abstract]  
Redeemable Noncontrolling Interest
The movement in the carrying value of the redeemable noncontrolling interests is as follows:
 
    
For the years ended December 31,
 
    
        2021        
    
        2021        
 
    
RMB
    
US$
 
    
(in thousands)
 
Balance as of December 31, 2020
  
 
—  
 
  
 
—  
 
Issuance of subsidiary shares
     30,000        4,708  
Accretion of redeemable noncontrolling interests
     —          —    
    
 
 
    
 
 
 
Balance as of December 31, 2021
  
 
30,000
 
  
 
4,708