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Intangible Assets - Estimated Future Amortization Expense of Intangible Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]    
2021 $ 40  
2022 40  
2023 40  
2024 40  
2025 40  
Thereafter 120  
Total $ 320 $ 360