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Accounting for Stock-Based Compensation - Additional Information (Details)
3 Months Ended 9 Months Ended
Mar. 01, 2020
USD ($)
shares
Mar. 01, 2019
USD ($)
shares
Sep. 30, 2020
USD ($)
$ / shares
shares
Jun. 30, 2020
shares
Mar. 31, 2020
shares
Sep. 30, 2019
USD ($)
shares
Sep. 30, 2020
USD ($)
Item
$ / shares
shares
Sep. 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 | $     $ 19,000,000       $ 19,000,000  
Employee service share-based compensation total compensation cost not yet recognized, period for recognition             24 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             26 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 0    
Weighted-average grant date fair value of stock options | $ / shares             $ 3.17 $ 3.05
Share Price | $ / shares     $ 4.22       $ 4.22  
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             24 months  
Employee service share-based compensation, unrecognized compensation costs on nonvested awards other than options | $     $ 16,000,000       $ 16,000,000  
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 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     10,423,344       10,423,344  
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