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Taxation - Schedule of Reconciliation of the differences between the statutory EIT rate (Detail)
12 Months Ended
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%