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Risk Assurance Liabilities (Tables)
 12 Months Ended
Dec. 31, 2021
Guarantees and Product Warranties [Abstract]  
Summary of Movement of Risk Assurance Liabilities
The movement of risk assurance liabilities during the years ended December 31, 2020 and 2021 are as follows:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
     As of December 31,  
     2020      2021  
     RMB      RMB      US$  
Balance at the beginning of the year
      259,952,473        460,829,299        72,314,173  
Fair value of risk assurance liabilities upon the inception of new loans
      348,921,174        443,831,604        69,646,863  
Performed risk assurance liabilities
      (150,312,528 )       (403,388,438 )       (63,300,448 ) 
Net loss on risk assurance liabilities
      2,268,180        197,750,449        31,031,361  
    
 
 
     
 
 
     
 
 
  
Balance at the end of the year
      460,829,299        699,022,914        109,691,949