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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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