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Leases - Summary of operating lease liabilities (Detail)
$ in Thousands
Sep. 30, 2019
USD ($)
Leases [Abstract]  
Three months ending December 31, 2019 $ 314
Twelve months ending December 31, 2020 1,305
Twelve months ending December 31, 2021 1,230
Twelve months ending December 31, 2022 1,022
Twelve months ending December 31, 2023 934
Twelve months ending December 31, 2024 640
Thereafter 1,979
Total undiscounted cash flows 7,425
Discount (753)
Lease liabilities $ 6,672