Long Term Debt (Details) $ / shares in Units, shares in Millions		1 Months Ended	3 Months Ended		9 Months Ended
	Jun. 29, 2021 $ / shares	Apr. 30, 2020 USD ($) $ / shares	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) shares	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Debt Instrument [Line Items]
Conversion of convertible debt					$ 37,340,000	$ 290,531,000
Gains (losses) on extinguishment of debt			$ (25,622,000)	$ (55,794,000)	(284,535,000)	(55,338,000)
Accrued interest payable			20,388,000		$ 20,388,000		$ 40,950,000
Common Stock Par Value
Debt Instrument [Line Items]
Debt conversion, shares converted into (in shares) | shares					55
Convertible Senior Notes due 2023 | Convertible Debt
Debt Instrument [Line Items]
Principal balance		$ 374,000,000
Long-term financing agreements, interest rate (as a percent)		7.00%
Proceeds from issuance of debt		$ 362,000,000
Conversion rate ratio	0.1541546	0.1538461
Conversion price (in dollars per share) | $ / shares	$ 6.49	$ 6.50
Conversion of convertible debt					$ 358,000,000
Convertible debt acquired			15,500,000
Payments to acquire convertible debt			37,000,000
Gains (losses) on extinguishment of debt			(21,000,000)
Outstanding amount of debt			0		0		53,000,000
Unamortized debt issuance cost							1,000,000
Accrued interest payable							$ 1,000,000
Interest expense			$ 238,000	$ 1,000,000	$ 2,000,000	$ 6,000,000