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Commitments and Contingencies - Operating Lease Expense (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Commitments And Contingencies Disclosure [Abstract]        
Operating lease expense $ 846 $ 853 $ 2,509 $ 2,311