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Commitments and Contingencies - Summary of Annual Commitments Pursuant to Operating Lease Agreements (Detail)
$ in Thousands
Sep. 30, 2019
USD ($)
Commitments And Contingencies Disclosure [Abstract]  
2019 $ 493
2020 538
2021 536
2022 547
2023 558
Thereafter 2,092
Total minimum lease payments $ 4,765