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Basis of Presentation - Narrative (Details) $ / shares in Units, $ in Thousands					3 Months Ended		9 Months Ended
	Jul. 22, 2020 USD ($)	May 12, 2020 USD ($)	Mar. 06, 2020 USD ($) $ / shares shares	Aug. 09, 2019 USD ($) shares	Sep. 30, 2020 USD ($) $ / shares shares	Mar. 31, 2020 USD ($) shares	Sep. 30, 2020 USD ($) Segments $ / shares	Sep. 30, 2019 USD ($)	Jun. 30, 2020 USD ($)	Dec. 31, 2019 USD ($) $ / shares	Dec. 31, 2018 USD ($)
Class of Stock [Line Items]
Cash and cash equivalents					$ 41,994		$ 41,994	$ 13,945		$ 12,074	$ 31,015
Working capital					$ 40,700		$ 40,700
Preferred stock, par value (in dollars per share) | $ / shares					$ 0.001		$ 0.001			$ 0.001
Preferred stock issued during the period							$ 25,000	10,000
2022 Notes conversion to equity							59,907	0
Gross proceeds from the issuance of 2025 Notes							100,000	0
Cash paid in exchange transaction		$ 32,000					$ 32,062	$ 0
Number of reportable segments | Segments							1
2025 Notes
Class of Stock [Line Items]
Debt conversion amount					$ 13,500
Conversion (shares) | shares					1,177,156
Value of converted amount					$ 13,500
Convertible Debt | 2022 Notes
Class of Stock [Line Items]
2022 Notes conversion to equity						$ 59,900
Stated interest rate (percent)						5.5
Carrying amount of debt		$ 45,000			0		$ 0		$ 2	$ 105,125
Debt conversion amount	$ 2					$ 59,900
Conversion (shares) | shares						13,688,876
Convertible Debt | 2025 Notes
Class of Stock [Line Items]
Stated interest rate (percent)		3.25
Gross proceeds from the issuance of 2025 Notes		$ 100,000
Carrying amount of debt		180,400			$ 166,898		$ 166,898
Debt issued in exchange transaction		$ 80,400
Series E Preferred Stock
Class of Stock [Line Items]
Issuance of shares (shares) | shares			25,000	10,000
Preferred stock, par value (in dollars per share) | $ / shares			$ 0.001		$ 0.001		$ 0.001			$ 0.001
Preferred stock issued during the period			$ 25,000	$ 10,000

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