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Stock-based Payments and Director Fees - Schedule of Management Fees and Director Fees (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares (in shares) 4,025 5,200 7,970 8,668
Amount of expense recognized $ 50 $ 40 $ 100 $ 80
Independent director fees        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares (in shares) 4,025 5,200 7,970 8,668
Amount of expense recognized $ 50 $ 40 $ 100 $ 80