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Income Taxes - Summary of deferred tax assets and deferred tax liabilities (Details) ¥ in Thousands, $ in Thousands | Dec. 31, 2024 USD ($) | Dec. 31, 2024 CNY (¥) | Dec. 31, 2023 CNY (¥) | Dec. 31, 2022 CNY (¥)
--- | --- | --- | --- | ---
Deferred tax assets |  |  |  |
Deductible advertising expenses exceeding the tax limit |  | ¥ 2,268 | ¥ 6,988 |
Accrued expenses |  | 55,012 | 54,496 |
Other deductible expenses exceeding the tax limit |  | 78 |  |
Provisions for the doubtful accounts |  | 19,117 | 16,212 |
Operating loss carry forward |  | 455,358 | 472,608 |
Less: valuation allowances |  | (358,569) | (378,851) | ¥ (378,815)
Total deferred tax assets |  | 173,264 | 171,453 |
Deferred tax liabilities |  |  |  |
Intangible assets |  | 37,734 | 43,801 |
Contract assets |  | 192,687 | 176,767 |
Total deferred tax liabilities |  | 230,421 | 220,568 |
Classification in the consolidated balance sheets: |  |  |  |
Deferred tax assets | $ 3,703 | 27,028 | 24,190 |
Deferred tax liabilities | $ 11,533 | ¥ 84,185 | ¥ 73,305 |

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