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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |  |
Statutory income tax rate | 25.00% | 25.00% | 25.00%
Non-deductable expense | 6.66% | 2.62% | 2.57%
Research and Development expense super deduction | (2.97%) | (1.44%) | (0.31%)
Effect of tax holiday | (18.86%) | (12.87%) | (4.24%)
Different tax rate of entities operating in other jurisdiction | (0.07%) | 0.00% | 0.00%
Valuation allowance | 0.32% | 0.00% | 0.00%
Change in tax rate | (3.13%) | 0.00% | 0.79%
True up | (0.40%) | 0.00% | 0.00%
Effective tax rate | 6.55% | 13.31% | 23.81%

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