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Income Taxes - Composition of deferred tax assets and liabilities (Details) - CNY (¥)
¥ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Deferred tax assets - noncurrent:    
Net operating tax losses carry forwards ¥ 67,468 ¥ 69,061
Allowances of doubtful accounts 16,108 11,656
Investment loss 7,263 1,747
Others 2,550  
Total deferred tax assets 93,389 82,464
Less: valuation allowance (93,237) (79,533)
Total deferred tax assets, net 152 2,931
Deferred tax liabilities - noncurrent:    
Unrealized investment gain (152) (2,931)
Total deferred tax liabilities (152) (2,931)
Accumulated operating losses 417,000 ¥ 408,000
Accumulated operating losses expire in 2025 54,000  
Accumulated operating losses expire in 2026 53,000  
Accumulated operating losses expire in 2027 51,000  
Accumulated Operating Losses Expire In 2028 28,000  
Operating Loss Carry Forwards Expire After 2028 ¥ 231,000  
HNTE    
Deferred tax liabilities - noncurrent:    
Operating loss carryforward period before legislative release in 2018 5 years  
Operating loss carryforward period after legislative release in 2018 10 years