Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation and Other Benefit Plans (Summary of Stock-Based Compensation) (Details)

v3.20.4
Stock-Based Compensation and Other Benefit Plans (Summary of Stock-Based Compensation) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Total stock-based compensation $ 114 $ 3,506 $ 2,388
Equity Award [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Total stock-based compensation 848 985 820
Liability Award [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Total stock-based compensation $ (734) $ 2,521 $ 1,568