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INCOME TAXES - Summary of reconciliations of differences between PRC statutory income tax rate and group's effective income tax rate (Detail) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Tax Disclosure [Abstract] |  |  |
Statutory income tax rate | 25.00% | 25.00% | 25.00%
Non-deductible expense | 2.54% | 6.66% | 2.62%
Research and Development expense super deduction | (0.62%) | (2.97%) | (1.44%)
Effect of tax holiday | (2.12%) | (18.86%) | (12.87%)
Different tax rate of entities operating in other jurisdiction | 4.86% | (0.07%) | 0.00%
Valuation allowance | 0.61% | 0.32% | 0.00%
Change in tax rate | 0.00% | (3.13%) | 0.00%
True up | 0.05% | (0.40%) | (0.00%)
Effective tax rate | 30.32% | 6.55% | 13.31%

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