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Stock-Based Compensation (Stock-Based Compensation Expense Recognized In General And Administrative Expenses) (Details) - 2016 Plan [Member] - General and Administrative Expenses [Member] - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]      
Total compensation expense $ (214)    
Total compensation expense   $ 1,303 $ 868