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Description of Business (Details) - USD ($)
1 Months Ended
Jul. 31, 2020
Sep. 30, 2020
Dec. 31, 2019
Debt Instrument [Line Items]      
Accumulated deficit   $ (1,974,061,000) $ (1,768,610,000)
Senior Secured Term Loan due 2023 | Senior Loans      
Debt Instrument [Line Items]      
Voluntary settlement of senior debt $ 156,300,000    
Senior Secured Term Loan due 2026 | Secured Debt      
Debt Instrument [Line Items]      
Credit facility maximum borrowing amount 400,000,000    
Proceeds from credit facility 385,900,000    
Voluntary settlement of senior debt 156,300,000    
Senior Secured Term Loan due 2026 | Secured Debt | Senior Loans      
Debt Instrument [Line Items]      
Credit facility maximum borrowing amount $ 400,000,000    
Term 6 years    
Proceeds from credit facility $ 385,900,000    
Senior Secured Term Loan due 2026 | Secured Debt | London Interbank Offered Rate (LIBOR)      
Debt Instrument [Line Items]      
Variable rate (in percent) 1.00%    
Basis spread on variable rate (in percent) 6.50%    
Senior Secured Term Loan due 2026 | Secured Debt | London Interbank Offered Rate (LIBOR) | Minimum | Senior Loans      
Debt Instrument [Line Items]      
Variable rate (in percent) 1.00%    
Senior Secured Term Loan due 2026 | Secured Debt | London Interbank Offered Rate (LIBOR) | Maximum | Senior Loans      
Debt Instrument [Line Items]      
Basis spread on variable rate (in percent) 6.50%