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Accounting for Stock-Based Compensation - Additional Information (Details)
3 Months Ended 6 Months Ended
Mar. 01, 2020
USD ($)
shares
Mar. 01, 2019
USD ($)
shares
Jun. 30, 2020
USD ($)
$ / shares
shares
Mar. 31, 2020
shares
Jun. 30, 2019
USD ($)
$ / shares
Jun. 30, 2020
USD ($)
Item
$ / shares
shares
Jun. 30, 2019
USD ($)
Item
$ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Employee service share-based compensation, unrecognized compensation costs on nonvested awards | $     $ 21,000,000     $ 21,000,000  
Employee service share-based compensation total compensation cost not yet recognized, period for recognition           26 months  
Employee service share-based compensation, nonvested awards, modifications to awards | Item           0 0
Aggregate intrinsic value of options exercised | $     0   $ 0 $ 0 $ 0
Employee Stock Option              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Employee service share-based compensation total compensation cost not yet recognized, period for recognition           28 months  
Employee service share-based compensation, unrecognized compensation costs on nonvested stock options | $     $ 3,000,000     $ 3,000,000  
Share-based compensation arrangement by share-based payment award, options, grants in period | shares     0 946,500      
Weighted-average grant date fair value of stock options | $ / shares         $ 1.63 $ 3.17 $ 2.36
Share Price | $ / shares     $ 3.01     $ 3.01  
Restricted Stock and Restricted Stock Units              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Employee service share-based compensation total compensation cost not yet recognized, period for recognition           26 months  
Employee service share-based compensation, unrecognized compensation costs on nonvested awards other than options | $     $ 18,000,000     $ 18,000,000  
Restricted Stock Units (RSUs)              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based compensation, number of shares received by each director | shares     0 310,347      
Restricted Stock              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based compensation arrangement award vesting rights           one-third increments on each of the first three anniversaries of the award date  
Share-based compensation, number of shares received by each director | shares     4,000 2,197,500      
Plan 2000              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based compensation arrangement award vesting rights           one-third increments on each of the first three anniversaries of the award date  
Plan 2000 | Contractual Term Of Option Granted Since 2008              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Contractual term of option granted           10 years  
Plan 2009              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based compensation arrangement award vesting rights           one-third increments on each of the first three anniversaries of the award date  
Unissued common stock reserved for grants | shares     10,384,418     10,384,418  
Plan 2009 | Restricted Stock Units (RSUs) | Non-management Directors              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based compensation, number of shares received by each director | shares 34,483 34,068          
Fair value of units granted | $ $ 170,000 $ 170,000          
Plan 2009 | Contractual Term of Option Granted in 2011 or Later              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Contractual term of option granted           10 years  
Performance-Based Awards Granted On Or After March 1, 2017 | Restricted Stock, Performance-Based Units              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based compensation arrangement by payment award, performance objective measurement period           3 years