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Leases (Tables)
12 Months Ended
Dec. 31, 2022
Disclosure Text Block [Abstract]  
Schedule of balance sheet information related to operating lease
   As of 
   December 31,   December 31, 
   2021   2022 
   RMB   RMB   US$ 
Right-of-use assets   6,463,320    31,403,688    4,509,044 
                
Operating lease liabilities – current   3,698,233    18,079,265    2,595,880 
Operating lease liabilities – non-current   2,539,151    13,276,535    1,906,288 
Total operating lease liabilities   6,237,384    31,355,800    4,502,168 

 

Schedule of weighted average remaining lease terms and discount rates
Remaining lease term and discount rate:    
Weighted average remaining lease term (years)   2.57 
Weighted average discount rate   4.20%

 

Schedule of future minimum payments
Year  Amounts 
2023   19,078,380 
2024   12,474,763 
2025   202,248 
2026   210,210 
2027   210,210 
Thereafter   781,282 
Total lease payments   32,957,093 
Less: imputed interest   (1,601,293)
Total operating lease liabilities, net of interest   31,355,800