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Intangible Assets and Goodwill - Estimated Future Amortization Expense for Definite-lived Intangible Assets (Detail)
$ in Thousands
Dec. 31, 2018
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
2019 $ 1,558
2020 1,554
2021 1,554
2022 1,554
2023 1,554
Thereafter 9,887
Total $ 17,661