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Share capital and additional paid-in capital (Details) - CNY (¥)
¥ in Thousands, shares in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Statement [Line Items]      
Disposal of discontinued operations and subsidiaries ¥ 27,931    
Additional paid-in capital      
Statement [Line Items]      
Beginning Balance, Amount     ¥ 383,174
Shares Issued During The Year, Amount 1,596 ¥ 54,509 510
Disposal of discontinued operations and subsidiaries 66,534    
Conversion of convertible notes 6,004    
Ending Balance, Amount 512,327 438,193 383,684
Ordinary Stock Shares [Member]      
Statement [Line Items]      
Beginning Balance, Amount     326
Shares Issued During The Year, Amount 139 3,470 14
Disposal of discontinued operations and subsidiaries 0    
Conversion of convertible notes 1,036    
Ending Balance, Amount 4,985 3,810 340
Total Equity [member]      
Statement [Line Items]      
Beginning Balance, Amount     383,500
Shares Issued During The Year, Amount 1,735 57,979 524
Disposal of discontinued operations and subsidiaries 66,534    
Conversion of convertible notes 7,040    
Ending Balance, Amount ¥ 517,312 ¥ 442,003 ¥ 384,024
Number of shares [Member]      
Statement [Line Items]      
Beginning Balance, Shares     1,002,201
Shares Issued During The Year, Shares 384,000 9,702,236 40,257
Conversion of convertible notes 2,876,194    
Ending Balance, Shares 14,004,888 10,744,694 1,042,458