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Property and Equipment - Future Minimum Lease Payments under Non-Cancelable Operating Leases (Detail)
$ in Thousands
Dec. 31, 2017
USD ($)
Operating Leases Future Minimum Payments Due [Abstract]  
2018 $ 992
2019 1,023
2020 848
2021 804
2022 828
Thereafter 1,070
Total minimum lease payments $ 5,565