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Components of Income Tax Expenses (Benefit) (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Current income tax expense:      
Foreign $ 4 $ 54 $ 0
U.S. Federal 422 0 163
Total current income tax expense 426 54 163
Deferred income tax expense (benefit):      
U.S. Federal 2,395 3,395 (8,268)
Total deferred income tax expense (benefit) 2,395 3,395 (8,268)
Total income tax expense (benefit) $ 2,821 $ 3,449 $ (8,105)