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Income Taxes - Summary of Income Tax (Expense) Benefit (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Current:    
Federal $ 0 $ 0
State (5) (3)
Foreign 0 0
Total current (5) (3)
Deferred:    
Federal 1,187 77
State 664 31
Foreign 0 0
Total deferred 1,851 108
Income tax benefit $ 1,846 $ 105