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Taxation - Summary of Income Tax Reconciliation (Detail)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Income Tax Disclosure [Abstract]      
Statutory income tax rate of the PRC 25.00% 25.00% 25.00%
Tax rate difference from preferential tax treatments and statutory rate in other jurisdictions (16.50%) (16.30%) (7.40%)
Effect of withholding taxes (0.30%)    
Permanent differences 26.60% 16.90% 5.60%
Change in valuation allowances (35.20%) (26.80%) (23.20%)
Effective income tax rate (0.40%) (1.20%)