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Mezzanine Equity (Tables)
12 Months Ended
Dec. 31, 2021
Temporary Equity [Line Items]  
Summary of Mezzanine Equity
    
As of December 31,
 
    
2020
    
2021
    
2021
 
    
RMB
    
RMB
    
US$
 
Balance as of January 1
     —          1,056,237         165,747  
Business combinations (Note 19)
     1,056,237               —    
Accretion of mezzanine equity

     —          411,792        64,619  
    
 
 
    
 
 
    
 
 
 
Balance as of December 31
     1,056,237        1,468,029        230,366