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Commitments and Contingencies - Future Minimum Rental Payments under Non-cancellable Operating Leases (Detail)
$ in Thousands
Dec. 31, 2018
USD ($)
Commitments and Contingencies Disclosure [Abstract]  
2019 $ 1,543
2020 2,280
2021 2,282
2022 2,244
2023 2,390
2024 and thereafter 4,371
Total $ 15,110