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Commitments and Contingencies - Future Minimum Lease Payments under Noncancelable Operating Leases (Detail)
$ in Thousands
Dec. 31, 2018
USD ($)
Commitments and Contingencies Disclosure [Abstract]  
2019 $ 5,526
2020 5,560
2021 5,593
2022 5,708
2023 5,869
Thereafter 13,458
Total $ 41,714