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Income Taxes - Summary of principal components of the deferred tax assets and liabilities (Details)
Dec. 31, 2024
CNY (¥)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
CNY (¥)
Deferred tax assets:      
Allowance for loan principal and financing service fee receivables     ¥ 19,785,153
Allowance for finance lease receivable ¥ 1,613,414 $ 221,037 7,706,311
Allowance for other current assets 19,387,060 2,656,016 30,286,267
Impairment loss from long-lived assets 385,314 52,788 539,153
Guarantee liabilities 47,762 6,543 3,517,157
Share-based compensation 34,309,231 4,700,345 33,692,676
Fair value change on investments 105,192,397 14,411,299 67,463,987
Fair value change on financial assets 839,617 115,027 82,220,720
Lease liabilities 11,008,553 1,508,166 18,156,568
Advertising cost 23,027,357 3,154,735 23,090,520
Uncollected revenue     4,798,460
Outside basis difference     19,604,247
Net operating loss carry forwards 609,993,234 83,568,730 775,049,194
Total deferred tax assets 805,803,939 110,394,686 1,085,910,413
Less: valuation allowance (759,896,561) (104,105,402) (1,008,969,418)
Total deferred tax assets, net of valuation allowance 45,907,378 6,289,284 76,940,995
Net off against deferred tax liabilities (45,907,378) (6,289,284) (76,940,995)
Net deferred tax assets 0 0 0
Deferred tax liabilities:      
Right-of-use assets 11,113,077 1,522,486 18,572,655
Fair value change on financial assets 34,794,301 4,766,798 58,368,340
Total deferred tax liabilities 45,907,378 6,289,284 76,940,995
Net off against deferred tax assets (45,907,378) (6,289,284) (76,940,995)
Net deferred tax liabilities ¥ 0 $ 0 ¥ 0