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Taxation - Schedule of Reconciliation of the differences between the statutory EIT rate (Detail) | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Income Tax Disclosure [Abstract] |  |  |
PRC Statutory income tax rate | 25.00% | 25.00% | 25.00%
Tax rate difference from statutory rate in other jurisdictions | 21.00% | 8.00% | (1.50%)
Effect of preferential tax rates and tax holiday | (11.00%) | (4.00%) | (0.50%)
Effect of permanent differences | (25.00%) | (2.60%) | (2.80%)
Additional deduction of qualified R&D expenditures | 16.00% | 7.70% | 4.20%
Changes in valuation allowance | 70.00% | (19.00%) | (23.40%)
Effect of changes in tax rates | (25.00%) | 0.00% | 0.00%
Effect of expiration on NOL | (49.00%) | (11.00%) | (0.20%)
Effect of deconsolidation on NOL | (22.00%) | 0.00% | 0.00%
Effective tax rates | 0.00% | 4.10% | 0.80%

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