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Commitments and Contingencies - Future Minimum Payments Under Operating Leases (Detail)
$ in Thousands
Dec. 31, 2018
USD ($)
Commitments And Contingencies Disclosure [Abstract]  
2019 $ 4,209
2020 3,542
2021 4,414
2022 4,042
2023 3,854
Thereafter 4,817
Operating leases, total $ 24,878