Quarterly report pursuant to Section 13 or 15(d)

Leases, Other Commitments, and Contingencies - Summary of Rent Expense from Operating Leases (Detail)

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Leases, Other Commitments, and Contingencies - Summary of Rent Expense from Operating Leases (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Operating Leases Rent Expense [Abstract]        
Rent expense from operating leases $ 24 $ 22 $ 71 $ 91