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Intangible Assets - Estimated Amortization Expense (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Intangible Assets      
Amortization of Intangible Assets $ 175 $ 175  
Estimated amortization expense      
Remainder of 2020 595    
2021 793    
2022 793    
2023 793    
2024 and thereafter 2,322    
Total $ 5,296   $ 5,539