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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 |

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