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Intangible Assets - Estimated Future Amortization Expenses (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]    
2021 $ 296  
2022 296  
2023 296  
2024 100  
Thereafter 0  
Total $ 988 $ 1,313