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Debt - Overview and Term Loan (Details) - USD ($)							1 Months Ended	3 Months Ended	6 Months Ended
	Jul. 22, 2020	May 12, 2020	Mar. 31, 2020	Mar. 06, 2020	Aug. 09, 2019	Aug. 23, 2017	Aug. 10, 2020	Mar. 31, 2020	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019	Jan. 09, 2017
Debt Instrument [Line Items]
Proceeds from completed registered offering									$ 100,000,000	$ 0
Cash paid in exchange transaction		$ 32,000,000.0							32,062,000	0
Payments repurchase of preferred stock									$ 2,354,000	$ 0
Series E Preferred Stock
Debt Instrument [Line Items]
Stock repurchased (in shares)		2,330
Payments repurchase of preferred stock		$ 2,400,000
Issuance of shares (shares)				25,000	10,000
South Ocean Funding LLC | Series E Preferred Stock
Debt Instrument [Line Items]
Issuance of shares (shares)			2,330
2025 Notes | Subsequent Event
Debt Instrument [Line Items]
Debt conversion amount							$ 13,500,000
Secured Debt | Term Loan
Debt Instrument [Line Items]
Principal amount											$ 47,500,000
Repayment of outstanding principal		47,500,000
Repayment of accrued interest		500,000
Prepayment fee		800,000
Exit fee		600,000
Debt aggregate face amount						$ 48,000,000.0
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]
Principal amount		45,000,000.0							$ 2,000		$ 105,125,000
Debt conversion amount		45,000,000.0						$ 59,900,000
Debt aggregate face amount												$ 119,800,000
Effective interest rate									12.89%
Convertible Debt | 2022 Notes | Subsequent Event
Debt Instrument [Line Items]
Debt conversion amount	$ 2,000
Convertible Debt | 2025 Notes
Debt Instrument [Line Items]
Principal amount		180,400,000							$ 180,375,000
Proceeds from completed registered offering		100,000,000.0
Debt issued in exchange transaction		$ 80,400,000
Effective interest rate									4.13%

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The amount of the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Face (par) amount of debt instrument at time of issuance.

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The cash outflow to reacquire preferred stock during the period.

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