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Description of Business (Details) - USD ($) | 1 Months Ended |  |
--- | --- | --- | ---
Jul. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Debt Instrument [Line Items] |  |  |
Accumulated deficit |  | $ 2,045,462,000 | $ 1,768,610,000
Senior Secured Term Loan Due2023 | Senior Loans |  |  |
Debt Instrument [Line Items] |  |  |
Early repayment of senior debt | $ 156,300,000 |  |
Secured Debt | Senior Secured Term Loan due 2026 |  |  |
Debt Instrument [Line Items] |  |  |
Maximum borrowing capacity | 400,000,000 |  |
Proceeds from secured lines of credit | 385,900,000 |  |
Early repayment of senior debt | $ 156,300,000 |  |
Secured Debt | Senior Secured Term Loan due 2026 | LIBOR |  |  |
Debt Instrument [Line Items] |  |  |
Variable rate | 1.00% |  |
Basis spread on variable rate | 6.50% |  |
Secured Debt | Senior Secured Term Loan due 2026 | Senior Loans |  |  |
Debt Instrument [Line Items] |  |  |
Maximum borrowing capacity | $ 400,000,000 |  |
Debt instrument term | 6 years |  |
Proceeds from secured lines of credit | $ 385,900,000 |  |
Secured Debt | Senior Secured Term Loan due 2026 | Senior Loans | Minimum | LIBOR |  |  |
Debt Instrument [Line Items] |  |  |
Variable rate | 1.00% |  |
Secured Debt | Senior Secured Term Loan due 2026 | Senior Loans | Maximum | LIBOR |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate | 6.50% |  |

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