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Stock-Based Compensation (Details) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
May 31, 2020
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation expense, net of $0 tax in 2018 and 2019   $ 760,000 $ 918,000 $ 1,814,000 $ 2,164,000
Stock-based compensation expense, tax   0 $ 0 0 $ 0
Unrecognized compensation cost   $ 4,000,000.0   $ 4,000,000.0  
Unrecognized compensation cost, weighted-average period       1 year 9 months 18 days  
Amended 2016 Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Increase in the aggregate number of shares 17,500,000