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Leases - Summary of maturities of lease matirities (Detail)
$ in Thousands
Sep. 30, 2020
USD ($)
Operating Leases [Member]  
Remainder of 2020 $ 315
2021 1,305
2022 1,090
2023 870
2024 512
Thereafter 691
Undiscounted lease cash flow commitments 4,783
Reconciling impact from discounting (607)
Lease liabilities on consolidated statement of financial position as of September 30, 2020 4,176
Finance Leases [Member]  
Remainder of 2020 12
2021 30
2022 9
Undiscounted lease cash flow commitments 51
Reconciling impact from discounting (5)
Lease liabilities on consolidated statement of financial position as of September 30, 2020 $ 46