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Income Taxes - Composition of deferred tax assets (Details) - CNY (¥) ¥ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Deferred tax assets-non-current: |  |  |
Net operating tax losses carry forwards | ¥ 69,061 | ¥ 51,541 |
Allowances of doubtful accounts | 11,656 | 12,564 |
Investment loss | 1,747 | 375 |
Total deferred tax assets | 82,464 | 64,480 |
Less: valuation allowance | (79,533) | (61,617) |
Total deferred tax assets, net | 2,931 | 2,863 |
Deferred tax liabilities-non-current: |  |  |
Unrealized investment gain | (2,931) | (2,863) |
Total deferred tax liabilities | (2,931) | (2,863) |
Accumulated operating losses | ¥ 408,000 | ¥ 298,000 |
Change in valuation allowance | (33.14%) | 2.52% | (25.55%)
Accumulated operating losses expire in 2025 | ¥ 55,000 |  |
Accumulated operating losses expire in 2026 | 53,000 |  |
Accumulated operating losses expire in 2027 | 48,000 |  |
Operating loss carry forwards expire after 2027 | ¥ 252,000 |  |
HNTE |  |  |
Deferred tax liabilities-non-current: |  |  |
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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