Debt - 5.00% Convertible Senior Notes Due 2021 (Details) - USD ($) $ in Millions	Sep. 30, 2021	Jun. 15, 2021	Dec. 31, 2020
5.00% Convertible Senior Notes due 2021
Debt Instrument [Line Items]
Debt instrument, interest rate (in percent)			5.00%
12.875% Senior Secured Notes due 2026
Debt Instrument [Line Items]
Debt instrument, interest rate (in percent)	12.875%		12.875%
Convertible Debt | 5.00% Convertible Senior Notes due 2021
Debt Instrument [Line Items]
Repurchased face amount		$ 48.7
Debt instrument, interest rate (in percent)	5.00%
Senior Notes | 12.875% Senior Secured Notes due 2026
Debt Instrument [Line Items]
Debt instrument, interest rate (in percent)	12.875%