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Leases - Supplemental lease cash flow (Details)
12 Months Ended
Dec. 31, 2024
CNY (¥)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
CNY (¥)
Leases      
Cash payments for operating leases ¥ 30,645,878 $ 4,198,468 ¥ 25,839,863
Operating ROU assets released in exchange for operating lease liabilities 24,904,133 3,411,852 26,602,626
Operating ROU assets obtained in exchange for new operating lease liabilities ¥ 51,284,880 $ 7,026,000 ¥ 115,402,428