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Goodwill (Tables)
12 Months Ended
Dec. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
Summary of Goodwill
The changes in the carrying amount of goodwill for the years ended December 31, 2020 and 2021 were as follows:
 

 
  
As of December 31,
 
 
  
RMB
 
  
US$
 
 
 
 
 
 
 
 
 
 
Balance at December 31, 2019
     145,063,857        20,837,119  
    
 
 
    
 
 
 
Balance at December 31, 2020
     145,063,857        22,232,009  
    
 
 
    
 
 
 
Goodwill acquired
     3,594,114        563,995  
    
 
 
    
 
 
 
Balance at December 31, 2021
     148,657,971        23,327,680