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Fair Value of Financial Instruments - Schedule of Debt (Details) - Convertible Debt - USD ($) | Sep. 30, 2020 | Dec. 31, 2019 | Nov. 30, 2019 | Feb. 28, 2014
--- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |
Par Value | $ 56,079,000 | $ 56,079,000 |  |
Carrying Value |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt | 54,121,000 | 53,821,000 |  |
Fair Value |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt | 144,161,000 | 75,097,000 |  |
2014 Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Par Value | 1,079,000 | 1,079,000 |  | $ 201,300,000
2014 Notes | Carrying Value |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt | 1,058,000 | 1,057,000 |  |
2014 Notes | Fair Value |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt | 1,122,000 | 1,122,000 |  |
2019 Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Par Value | 55,000,000 | 55,000,000 | $ 55,000,000.0 |
2019 Notes | Carrying Value |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt |  | 52,764,000 |  |
2019 Notes | Fair Value |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt | $ 143,039,000 | $ 73,975,000 |  |

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- Definition Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13433-108611 + Details
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