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Depreciation Expense Related to Property and Equipment (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Property Plant And Equipment [Abstract]        
Depreciation Expense $ 508 $ 445 $ 1,449 $ 1,346