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Commitments and Contingencies - Future Minimum Lease Payments Under Noncancellable Operating Leases (Detail)
$ in Thousands
Sep. 30, 2018
USD ($)
Commitments and Contingencies Disclosure [Abstract]  
Remainder of 2018 $ 294
2019 1,249
2020 1,277
2021 1,154
2022 1,073
Thereafter $ 51