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Convertible Senior Notes, Net (Details)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021 USD ($) $ / shares	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) $ / shares	Sep. 30, 2020 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($) offering	Dec. 31, 2020 USD ($)
Debt Instrument [Line Items]
Proceeds from issuance of senior secured notes			$ 500,000,000	$ 0
Unamortized discount	$ 4,387,000		$ 4,387,000
Common Stock
Debt Instrument [Line Items]
Share price (in dollars per share) | $ / shares	$ 14.83		$ 14.83
Convertible Debt
Debt Instrument [Line Items]
Debt instrument, face amount	$ 575,000,000		$ 575,000,000				$ 575,000,000
Interest expense	7,200,000		21,600,000
Non-cash interest expense	1,600,000	$ 1,500,000	4,700,000	$ 4,500,000
Convertible Debt | 2022 Notes
Debt Instrument [Line Items]
Number of debt offerings issued | offering						2
Debt instrument, face amount	$ 345,000,000		$ 345,000,000			$ 345,000,000	$ 345,000,000
Stated interest rate	4.75%		4.75%			4.75%	4.75%
Proceeds from issuance of senior secured notes						$ 337,500,000
Convertible senior notes, net	$ 342,400,000		$ 342,400,000
Unamortized discount	2,600,000		2,600,000
Convertible Debt | 2022 Notes | Additional Paid-In-Capital
Debt Instrument [Line Items]
Conversions of convertible senior notes for common stock			11,000,000
Convertible Debt | 2023 Notes
Debt Instrument [Line Items]
Debt instrument, face amount	$ 230,000,000		$ 230,000,000		$ 230,000,000		$ 230,000,000
Stated interest rate	5.38%		5.38%		5.375%		5.38%
Proceeds from issuance of senior secured notes					$ 223,700,000
Convertible senior notes, net	$ 226,500,000		$ 226,500,000
Unamortized discount	$ 3,500,000		3,500,000
Convertible Debt | 2023 Notes | Additional Paid-In-Capital
Debt Instrument [Line Items]
Conversions of convertible senior notes for common stock			4,400,000
Convertible Debt | 2022 and 2023 Notes | Additional Paid-In-Capital
Debt Instrument [Line Items]
Conversions of convertible senior notes for common stock			$ 15,400,000

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