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Debt - Term Loan (Details) - USD ($) $ in Thousands					9 Months Ended
	May 12, 2020	Mar. 31, 2020	Mar. 06, 2020	Aug. 23, 2017	Sep. 30, 2021	Sep. 30, 2020	Jan. 09, 2017
Debt Instrument [Line Items]
Payments repurchase of preferred stock					$ 0	$ 2,354
Series E preferred stock
Debt Instrument [Line Items]
Issuance of shares (shares)			25,000
Stock repurchased (in shares)	2,330
Payments repurchase of preferred stock	$ 2,400
South Ocean Funding LLC | Series E preferred stock
Debt Instrument [Line Items]
Issuance of shares (shares)		2,330
Secured Debt | Term Loan
Debt Instrument [Line Items]
Debt aggregate face amount				$ 48,000
Repayment of outstanding principal	47,500
Repayment of accrued interest	500
Prepayment fee	$ 1,400
Interest rate base minimum (percent)				1.00%
Effective interest rate						15.19%
Secured Debt | Term Loan | LIBOR
Debt Instrument [Line Items]
Applicable margin on interest rate (percent)				7.625%
Convertible Debt | 2022 Notes
Debt Instrument [Line Items]
Debt aggregate face amount							$ 119,800
Effective interest rate						12.89%
Convertible Debt | 2025 Notes
Debt Instrument [Line Items]
Effective interest rate					4.15%

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