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Commitments and Contingencies - Schedule of Future Minimum Lease Payments (Detail) - Property Leases [Member]
$ in Thousands
Dec. 31, 2017
USD ($)
Operating Leased Assets [Line Items]  
2018 $ 5,453
2019 5,616
2020 4,963
2021 5,507
2022 3,861
Total future minimum lease payments $ 25,400