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Goodwill & Intangibles - Summary of Future Estimated Amortization Expense (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Finite Lived Intangible Assets Future Amortization Expense [Abstract]    
2019 (3 months ended December 31, 2019) $ 17  
2020 67  
2021 36  
Total $ 120 $ 170