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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

X

- Definition

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

+ References

Reference 1: 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=119993939&loc=d3e28551-108399

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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

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