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Property and equipment, net - Schedule of property and equipment, net (Details)
Dec. 31, 2022
CNY (¥)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
CNY (¥)
Property and equipment, net      
Gross carrying amount ¥ 129,306,169   ¥ 132,152,547
Less: accumulated depreciation (112,318,279)   (107,041,834)
Property and equipment, net 16,987,890 $ 2,463,013 25,110,713
Computer and transmission equipment      
Property and equipment, net      
Gross carrying amount 96,802,675   100,007,413
Leasehold improvements      
Property and equipment, net      
Gross carrying amount 26,155,889   24,462,607
Furniture and office equipment      
Property and equipment, net      
Gross carrying amount 5,937,405   7,272,327
Motor vehicles      
Property and equipment, net      
Gross carrying amount ¥ 410,200   ¥ 410,200