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Related Party Transactions (Details)
3 Months Ended 12 Months Ended
Dec. 04, 2020
shares
Oct. 06, 2020
shares
Mar. 31, 2021
USD ($)
financial_Institution
shares
Mar. 31, 2020
USD ($)
shares
Dec. 31, 2020
USD ($)
financial_Institution
shares
Dec. 31, 2019
USD ($)
May 29, 2020
USD ($)
Related Party Transaction [Line Items]              
Number of financial institutions, debt issued | financial_Institution     5   5    
Number of financial institutions, considered related party | financial_Institution     3   3    
Minimum percentage of common stock held by related party, right to nominate one director     10.00%   10.00%    
Interest expense, related party | $     $ 1,800,000 $ 17,900,000 $ 31,300,000 $ 57,600,000  
Due to related parties | $     $ 73,000,000.0   $ 71,200,000 $ 497,200,000  
Vested (in shares) | shares 30,000.00            
Restricted stock units              
Related Party Transaction [Line Items]              
Vested (in shares) | shares     581,000 583,000 179,085    
Directors              
Related Party Transaction [Line Items]              
Due to affiliate | $     $ 200,000   $ 200,000    
Related party transaction, amount | $     $ 100,000   $ 100,000    
Directors | Restricted stock units              
Related Party Transaction [Line Items]              
Vested (in shares) | shares     5,047   5,047    
Affiliated entity | Warrants | Highbridge              
Related Party Transaction [Line Items]              
Units issued (in shares) | shares   833,333          
Affiliated entity | Warrants | Mudrick              
Related Party Transaction [Line Items]              
Units issued (in shares) | shares   3,222,222          
Subordinated Notes              
Related Party Transaction [Line Items]              
Stated amount of borrowing | $     $ 80,000,000.0       $ 80,000,000.0