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Organization and Significant Accounting Policies - Estimated Future Amortization Expense (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Accounting Policies [Abstract]    
2020 $ 144  
2021 150  
2022 116  
2023 83  
2024 62  
Thereafter 351  
Net Carrying Amount $ 906 $ 1,164