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Income Taxes - Provision for Income Taxes (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Current:    
State $ 129 $ 7
Total current 129 7
Deferred:    
Federal 47 36
State 4 2
Total deferred 51 38
Total income tax expense $ 180 $ 45