Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation - Schedule of Activity Related to PSAs, PSUs, and RSUs (Details)

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Stock-Based Compensation - Schedule of Activity Related to PSAs, PSUs, and RSUs (Details) - $ / shares
12 Months Ended
Sep. 11, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Performance Shares, Performance Share Units and Restricted Stock Units        
Number of Shares (in thousands)        
Outstanding at beginning of period (in shares)   868,300    
Granted (in shares)   691,100    
Vested (in shares)   0    
Forfeited (in shares)   (90,300)    
Outstanding at end of period (in shares)   1,257,400 868,300  
Weighted-Average Grant-Date Fair Value (per share)        
Outstanding at beginning of period (in dollars per share)   $ 10.53    
Granted (in dollars per share)   0.90    
Vested (in dollars per share)   0    
Forfeited (in dollars per share)   4.15    
Outstanding at end of period (in dollars per share)   $ 4.69 $ 10.53  
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period 371,430 691,130    
Performance Shares        
Weighted-Average Grant-Date Fair Value (per share)        
Outstanding at beginning of period (in dollars per share)   $ 13.25 13.97  
Outstanding at end of period (in dollars per share)     $ 13.25 $ 13.97
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period     200,900 354,700