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Commitments and Contingencies - Future Minimum Commitments under Non-Cancelable Operating Leases with Initial or Remaining Terms of One Year or More (Detail)
$ in Thousands
Sep. 30, 2018
USD ($)
Leases [Abstract]  
2018 $ 1,179
2019 4,478
2020 3,774
2021 3,372
2022 2,549
Thereafter 4,097
Future minimum lease payments $ 19,449