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Stockholders' Equity - Compensation Expense & Tax Benefit (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Compensation expense for stock options        
Compensation expense (benefit) $ 305 $ 125 $ 810 $ 407
Related tax benefit (expense)   $ 26   $ 88
Restricted Stock Units (RSUs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Balance of 2021 206   206  
2022 503   503  
2023 270   270  
2024 $ 22   $ 22