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Intangible Assets - Estimated Amortization Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Intangible Assets        
Amortization of Intangible Assets $ 200 $ 300 $ 398 $ 338
Estimated amortization expense        
Remainder of 2020 667   667  
2021 1,334   1,334  
2022 1,334   1,334  
2023 1,334   1,334  
2024 and thereafter 4,905   4,905  
Totaal $ 9,574   $ 9,574