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Commitments and Contingencies - Summary of Future Minimum Payments Under Company's Lease Obligation (Detail)
$ in Thousands
Dec. 31, 2018
USD ($)
Leases [Abstract]  
2019 $ 3,048
2020 2,980
2021 2,930
2022 3,009
2023 3,089
Thereafter 2,364
Total, Future minimum payments $ 17,420