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Income Taxes - Summary of deferred tax assets and deferred tax liabilities (Details) ¥ in Thousands, $ in Thousands | Dec. 31, 2023 USD ($) | Dec. 31, 2023 CNY (¥) | Dec. 31, 2022 CNY (¥) | Dec. 31, 2021 CNY (¥)
--- | --- | --- | --- | ---
Deferred tax assets |  |  |  |
Deductible advertising expenses exceeding the tax limit |  | ¥ 6,988 | ¥ 18,945 |
Accrued expenses |  | 54,496 | 50,516 |
Other deductible expenses exceeding the tax limit |  |  | 448 |
Provisions for the prepayments and other non-current assets |  | 16,212 | 14,761 |
Operating loss carry forward and others |  | 472,608 | 431,335 |
Less: valuation allowances |  | (378,851) | (378,815) | ¥ (499,090)
Total deferred tax assets |  | 171,453 | 137,190 |
Deferred tax liabilities |  |  |  |
Intangible assets |  | 43,801 | 13,551 |
Contract assets |  | 176,767 | 138,419 |
Advance from customer |  |  | 8,757 |
Total deferred tax liabilities |  | 220,568 | 160,727 |
Classification in the consolidated balance sheets: |  |  |  |
Deferred tax assets | $ 3,407 | 24,190 | 6,166 |
Deferred tax liabilities | $ 10,325 | ¥ 73,305 | ¥ 29,703 |

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