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Commitments and Contingencies - Future Minimum Commitments Under ASC 840 Under Operating Leases (Detail)
$ in Thousands
Dec. 31, 2018
USD ($)
Commitments And Contingencies Disclosure [Abstract]  
2019 $ 997
2020 1,026
2021 1,058
2022 1,089
2023 1,122
2024 and thereafter 3,126
Total lease payments $ 8,418