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Commitments and Contingencies - Estimated Annual Future Minimum Payments under Operating Leases (Detail)
$ in Thousands
Jun. 30, 2018
USD ($)
Commitments And Contingencies Disclosure [Abstract]  
2018 $ 1,375
2019 1,880
2020 1,192
2021 886
2022 898
Thereafter 2,848
Operating Leases, Future Minimum Payments Due, Total $ 9,079