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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% |  |

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