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Income Taxes - Summarizes of Changes in Unrecognized Tax Benefits (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Income Tax Disclosure [Abstract]    
Unrecognized tax benefits at beginning balance $ 15,656 $ 11,983
Decrease for prior year tax positions (6) (7)
Increase for current year tax positions 4,763 3,680
Unrecognized tax benefits at ending balance $ 20,413 $ 15,656