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Credit Facilities (Deerfield Facility Agreement, as Amended) (Details)						12 Months Ended
	Apr. 03, 2019 USD ($) $ / shares shares	Apr. 01, 2019 USD ($) day $ / shares shares	Mar. 31, 2019 USD ($)	Aug. 09, 2018 USD ($)	Jan. 12, 2018 USD ($)	Dec. 31, 2019 USD ($) shares	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Mar. 04, 2020 USD ($)	Apr. 03, 2017 USD ($)	Nov. 02, 2015
Debt Instrument [Line Items]
Stock trigger price (usd per share) \| $ / shares	$ 6.61
Maximum equity owned by Investor						9.50%
Number of shares issued \| shares	7,889,552
Sale of stock price per share (usd per share) \| $ / shares	$ 6.61
Consideration received on transaction	$ 52,150,000.00		$ 52,200,000
Gain (loss) on extinguishment of debt						$ (11,756,000)	$ (2,270,000)	$ (6,512,000)
Long-term debt						$ 245,303,000
Convertible Senior Notes Due 2020
Debt Instrument [Line Items]
Debt instrument, stated interest rate				3.25%		3.25%
Voluntary Conversion
Debt Instrument [Line Items]
Stock trigger price (usd per share) \| $ / shares	$ 7.271
Term loan facility
Debt Instrument [Line Items]
Long-term debt						$ 167,858,000
Term loan facility \| Facility Agreement
Debt Instrument [Line Items]
Debt instrument face amount										$ 120,000,000
Term loan facility \| Amended Facility Agreement
Debt Instrument [Line Items]
Debt instrument face amount				$ 40,500,000.0
Term loan facility \| Term Loan
Debt Instrument [Line Items]
Long-term debt						141,300,000.0
Deferred financing cost						2,600,000.0
First Out Waterfall Notes
Debt Instrument [Line Items]
Gain (loss) on extinguishment of debt						(29,300,000.0)
Fair value of warrants issued in connection with the facility agreement						4,800,000.0
Derivative liabilities removal						5,900,000.0
Convertible notes
Debt Instrument [Line Items]
Long-term debt						73,164,000
Convertible notes \| Convertible Senior Notes Due 2020
Debt Instrument [Line Items]
Debt instrument face amount				$ 40,500,000.0
Debt instrument, stated interest rate				3.25%							3.25%
Gain (loss) on extinguishment of debt						$ 17,500,000.0
Convertible notes \| Convertible Senior Notes Due 2024
Debt Instrument [Line Items]
Debt instrument, stated interest rate						5.00%
Interest rate, payable in kind						4.75%
Revolving loan facility
Debt Instrument [Line Items]
Debt instrument, stated interest rate			5.50%
Deferred financing cost						$ 400,000.0
Revolving loan facility \| Amended and Restated Facility Agreement
Debt Instrument [Line Items]
Debt instrument face amount				$ 40,500,000.0
Deerfield ELGX Revolver, LLC
Debt Instrument [Line Items]
Stock trigger price (usd per share) \| $ / shares		$ 6.625
Mandatory conversion of shares		$ 1,666,666
Voluntary conversion amount		$ 50,000,000.0				1,700,000.0
Maximum equity owned by Investor		4.985%
Line of credit facility increase (decrease)				5,000,000.0
Exit fee upon termination		$ 6,100,000.0		11,100,000.0
Commitment reduction		$ 10,000,000
Debt instrument, carrying amount of equity component						$ 1,300,000.0
Deerfield ELGX Revolver, LLC \| Fixed Price Conversion
Debt Instrument [Line Items]
VWAP Days \| day		5
Deerfield ELGX Revolver, LLC \| Voluntary Conversion
Debt Instrument [Line Items]
VWAP Days \| day		15
Volume weighted average price rate trigger		85.00%
Deerfield ELGX Revolver, LLC \| Optional Required Voluntary Conversion
Debt Instrument [Line Items]
VWAP Days \| day		15
Volume weighted average price rate trigger		175.00%
Deerfield ELGX Revolver, LLC \| Term loan facility \| Second Amendment to Facility Agreement
Debt Instrument [Line Items]
Maximum number of shares under mandatory redemption \| shares		1,430,001
Percentage of market value attributable to principal that is paid with common stock		96.00%
Deerfield ELGX Revolver, LLC \| First Out Waterfall Notes \| Second Amendment to Facility Agreement
Debt Instrument [Line Items]
Maximum number of shares under mandatory redemption \| shares						251,571
Deerfield ELGX Revolver, LLC \| Revolving loan facility
Debt Instrument [Line Items]
Debt instrument face amount			$ 120,000,000.0
Global liquidity requirement			$ 17,500,000.0	$ 22,500,000.0		$ 17,500,000.0
Waterfall loans due			16.67%				33.33%
Remainder of the first out water fall loans			50.00%
Gain (loss) on extinguishment of debt					$ (2,270,000.000)
Optional stock payment for interest removed \| shares						250,000
Revolving loan facility						$ 0
Maximum \| Term loan facility \| Term Loan
Debt Instrument [Line Items]
Interest expense						29,600,000.0
Maximum \| Deerfield ELGX Revolver, LLC
Debt Instrument [Line Items]
Mandatory conversion of shares		$ 25,000,000.0
Minimum \| Term loan facility \| Term Loan
Debt Instrument [Line Items]
Interest expense						$ 4,500,000.0
Subsequent Event \| Deerfield ELGX Revolver, LLC \| Revolving loan facility \| First Out Waterfall Notes
Debt Instrument [Line Items]
Percentage of loans for extended due date									8.333%
Revolving loan facility									$ 10,700,000