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Leases - Minimum Lease Payments Under Non-cancelable Operating Leases (Detail)
$ in Thousands
Dec. 31, 2018
USD ($)
Leases [Abstract]  
2019 $ 2,652
2020 2,668
2021 2,618
2022 2,697
2023 2,777
Thereafter 2,373
Total, Future minimum payments $ 15,785