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Intangible Assets (Schedule of future amortization expense for amortizable intangible assets) (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Dec. 31, 2018
Intangible Assets      
2020 $ 10    
2021 42    
2022 42    
2023 42    
2024 42    
Thereafter 31    
Total $ 209 $ 241 $ 284