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Taxation - Summary of Net Deferred Tax Assets (Detail) - CNY (¥) ¥ in Thousands | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | --- | ---
Components of Deferred Tax Assets [Abstract] |  |  |  |
Net operating loss carry-forwards | ¥ 70,985 | ¥ 86,679 | ¥ 86,628 |
Deductible advertising expenses | 262,801 | 161,842 | 87,639 |
Others | 1,062 | 1,511 | 1,490 |
Total deferred tax assets | 334,848 | 250,032 | 175,757 |
Less: valuation allowance | (334,848) | (250,032) | (175,757) | ¥ (75,501)
Total deferred tax assets, net of valuation allowance | ¥ 0 | ¥ 0 | ¥ 0 |

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