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Intangible Assets - Estimated Amortization Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Intangible Assets      
Amortization of Intangible Assets $ 698 $ 693 $ 593
Estimated amortization expense      
2020 801    
2021 801    
2022 801    
2023 801    
2024 and thereafter 2,335    
Total $ 5,539 $ 3,890