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Intangible Assets - Estimated Future Amortization Expense for Intangible Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Estimated future amortization expense [Abstract]    
2019 (excluding the nine months ended September 30, 2019) $ 246  
2020 985  
2021 977  
2022 955  
2023 954  
Thereafter 1,786  
Net Carrying Amount $ 5,903 $ 7,204