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Goodwill and Other Intangible Assets - Schedule of Expected Amortization of Intangible Asset (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]    
Remainder of 2019 $ 400  
2020 534  
2021 534  
2022 534  
2023 534  
Thereafter 1,153  
Total $ 3,689 $ 3,800