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Intangible Assets - Estimated Future Amortization Expense for Intangible Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Estimated future amortization expense [Abstract]    
2020 (excluding the nine months ended September 30, 2020) $ 274  
2021 1,034  
2022 933  
2023 933  
2024 933  
Thereafter 983  
Net book value $ 5,090 $ 5,639