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Commitments and Contingencies - Future Minimum Rental Payments under Non-Cancelable Operating Leases with Original Maturities of Greater than 12 Months (Detail)
$ in Thousands
Dec. 31, 2017
USD ($)
Commitments And Contingencies Disclosure [Abstract]  
2018 $ 3,073
2019 927
2020 805
2021 793
Thereafter 2,907
Total $ 8,505