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Intangible Assets - Estimated Amortization Expense (Detail)
$ in Thousands
Mar. 31, 2018
USD ($)
Goodwill And Intangible Assets Disclosure [Abstract]  
Remainder of 2018 $ 1,398
2019 2,795
2020 2,620
2021 2,481
2022 2,441
2023 $ 1,807