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Commitments and Contingencies - Purchase Obligations - (Detail)
$ in Millions
Dec. 31, 2017
USD ($)
Purchase Obligation Fiscal Year Maturity  
Purchase obligations, 2018 $ 2.7
Purchase obligations, 2019 2.1
Purchase obligations, 2020 1.0
Purchase obligations, 2021 0.6
Purchase obligations, Total $ 6.4