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Summary of Significant Accounting Policies - Foreign Currency Adjustments (Narrative) (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Summary of Significant Accounting Policies      
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax $ 214,000 $ (229,000) $ (88,000)