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Intangible Asset Estimated Amortization Expense (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Goodwill And Intangible Assets Disclosure [Abstract]    
2019 $ 646  
2020 646  
2021 646  
2022 646  
2023 646  
Thereafter 4,250  
Intangible asset, net $ 7,480 $ 8,126