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Etratech Acquisition - Summary of Amortization Expense for Prospective Years (Detail) - Etratech Inc.
$ in Thousands
Jun. 30, 2018
USD ($)
Business Acquisition [Line Items]  
July 1, 2018 through December 31, 2018 $ 1,844
2019 3,688
2020 3,688
2021 3,627
2022 3,208
2023 $ 2,546