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Income Taxes - Schedule of Activity Related Unrecognized Tax Benefits (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]      
Beginning of year—unrecognized tax benefits $ 2,610 $ 2,077 $ 1,089
Decrease for tax positions taken during prior periods   (711) (453)
Increases for tax positions taken during current period 1,415 1,244 1,441
End of year—unrecognized tax benefits $ 4,025 $ 2,610 $ 2,077