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Income tax expense (Details) - CNY (¥)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Statement [Line Items]      
Profit/(loss) Before Income Taxes ¥ (395,803,000) ¥ (30,344,000) ¥ (128,072,000)
Income Taxes [member]      
Statement [Line Items]      
Profit/(loss) Before Income Taxes (395,803,000) (30,344) (128,072,000)
Computed Expected Income Tax Expense (98,951,000) (7,586,000) (32,018,000)
Tax Effect Of Non-deductible Expenses 109,650,000 7,573,000 33,058,000
Tax Effect Of Tax-exempt Entities (2,580,000) (1,503,000) 604,000
Tax Effect Of Non-taxable Income (8,119,000) 1,516,000 (1,644,000)
Income Tax Expense ¥ 0 ¥ 0 ¥ 0