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Stock-based Payments and Director Fees - Restricted Stock Plan Expenses (Details) - Restricted stock - 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]        
Total expenses for plan grants $ 325 $ 174 $ 556 $ 348
Employee And Service Provider        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total expenses for plan grants 207 174 414 348
Director        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total expenses for plan grants $ 118 $ 0 $ 142 $ 0