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Goodwill & Intangibles - Summary of Future Estimated Amortization Expense (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Finite Lived Intangible Assets Future Amortization Expense [Abstract]    
2019 $ 50  
2020 67  
2021 36  
Total $ 153 $ 170