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Income Taxes - Reconciliation of Beginning and Ending Amounts of Unrecognized Tax Benefits (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Income Tax Disclosure [Abstract]    
Gross unrecognized tax benefits at the beginning of the year $ 548 $ 328
Additions from tax positions taken in the current year 233 214
Additions from tax positions taken in prior years 531 6
Reductions from tax positions taken in prior years (548)  
Gross unrecognized tax benefits at the end of the year $ 764 $ 548