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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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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6036836-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The cash outflow to reacquire preferred stock during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585 + Details
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- Definition Amount of cash outflow for cost from early extinguishment and prepayment of debt. Includes, but is not limited to, third-party cost, premium paid, and other fee paid to lender directly for debt extinguishment or debt prepayment. Excludes accrued interest. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585 + Details
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- Definition The cash inflow from the issuance of a long-term debt instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3255-108585 + Details
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