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Leases (Tables)
 12 Months Ended
Dec. 31, 2023
Leases [Abstract]  
Schedule of Balance Sheet Information Related to Operating Lease Supplemental balance sheet information related to operating lease was as follows:
   As of 
   December 31,   December 31, 
   2022   2023 
   RMB   RMB   US$ 
Right-of-use assets   31,403,688    12,237,211    1,728,505 
Less: impairment   
-
    (3,244,676)   (458,857)
Right-of-use assets   31,403,688    8,992,535    1,269,648 
                
Operating lease liabilities – current   18,079,265    8,806,671    1,243,406 
Operating lease liabilities – non-current   13,276,535    5,216,622    736,530 
Total operating lease liabilities   31,355,800    14,023,293    1,979,936 
   As of 
   December 31,   December 31, 
   2022   2023 
   RMB   RMB   US$ 
Lease expense            
Operating lease expense - third party   10,933,292    10,148,284    1,432,827 
Short-term lease expense   
-
    15,056,781    2,125,853 
Sublease income (1)   
-
    (707,009)   (99,822)
Total lease expense   10,933,292    24,498,055    3,458,858 
                
Other information               
Cash paid for operating leases        8,543,549    1,206,256 
Right-of-use assets obtained in exchange for operating new lease liabilities   35,873,660    15,838,886    2,236,278 
* (1)For the year ended December 31, 2023, the Group incurred sublease income of RMB 707,009 (US$99,822), and sublease cost of RMB 858,098 (US$121,154).
Schedule of Weighted Average Remaining Lease Terms and Discount Rates The weighted average remaining lease terms and discount rates for the operating lease as of December 31, 2023 were as follows:
Remaining lease term and discount rate:    
Weighted average remaining lease term (years)   2.33 
Weighted average discount rate   4.2%
Schedule of Future Minimum Payments The following is a schedule of future minimum payments under the Group’s operating leases as of December 31, 2023:
Year  Amounts 
   RMB   US$ 
2024   9,206,946    1,299,920 
2025   3,510,711    495,674 
2026   581,689    82,128 
2027   539,727    76,204 
2028   334,122    47,174 
Thereafter   558,808    78,898 
Total lease payments   14,732,003    2,079,998 
Less: imputed interest   708,710    100,062 
Total operating lease liabilities, net of interest   14,023,293    1,979,936