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Debt Covenant, Minimum Global Liquidity Requirement

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Derivative Liabilities Removal

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Maximum Equity Owned by Investor

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Optional Stock Payment for Interest Payment Removed

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Percentage Of Market Value Attributable to Principal That Is Paid With Common Stock

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Price of the entity's common stock which would be required to be attained for the conversion feature embedded in the debt instrument to become effective.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Amount, after accumulated amortization, of debt discount.

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Amount of issuance costs recognized in a share-lending arrangement entered into by the entity, in contemplation of a convertible debt offering or other financing, before deduction of accumulated amortization or effects of subsequent adjustments.

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Interest paid other than in cash for example by issuing additional debt securities. As a noncash item, it is added to net income when calculating cash provided by or used in operations using the indirect method.

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Cash received on stock transaction after deduction of issuance costs.

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Credit Facilities (Deerfield Facility Agreement, as Amended) (Details)						3 Months Ended		6 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 ($)	Jun. 30, 2019 USD ($) shares	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) shares	Jun. 30, 2018 USD ($)	Dec. 31, 2018	Apr. 03, 2017 USD ($)	Nov. 02, 2015 USD ($)
Debt Instrument [Line Items]
Stock trigger price (usd per share) \| $ / shares	$ 6.61
Maximum equity owned by Investor						9.50%		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		$ 52,150,000
Gain (loss) on extinguishment of debt						$ (11,756,000)	$ 0	$ (11,756,000)	$ (2,270,000)
Paid-in-Kind interest								3,883,000	$ 0
Long-term Debt, Gross						244,639,000		244,639,000
Convertible Senior Notes Due 2020
Debt Instrument [Line Items]
Debt instrument face amount				$ 40,500,000.0
Debt instrument, stated interest rate				3.25%
Credit Agreement
Debt Instrument [Line Items]
Debt instrument face amount					$ 50,000,000
Global liquidity requirement								17,500,000
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, Gross						163,860,000		163,860,000
Term loan facility \| Facility Agreement, Due 2023
Debt Instrument [Line Items]
Debt instrument face amount											$ 120,000,000.0
Term loan facility \| Term Loan [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross						124,600,000		124,600,000
Deferred financing cost						3,200,000		3,200,000
Convertible notes
Debt Instrument [Line Items]
Long-term Debt, Gross						76,498,000		$ 76,498,000
Convertible notes \| Convertible Senior Notes Due 2020
Debt Instrument [Line Items]
Debt instrument face amount												$ 125,000,000
Debt instrument, stated interest rate												3.25%
Gain (loss) on extinguishment of debt						$ 17,500,000
Debt instrument, unamortized discount												$ 2,900,000
Convertible notes \| Convertible Senior Notes Due 2024
Debt Instrument [Line Items]
Debt instrument, stated interest rate						5.00%		5.00%
Interest rate, payable in kind						4.75%		4.75%
First Out Waterfall Notes
Debt Instrument [Line Items]
Gain (loss) on extinguishment of debt						$ 29,300,000
Fair Value Adjustment of Warrants						4,800,000
Derivative Liabilities Removal						5,900,000
Revolving loan facility
Debt Instrument [Line Items]
Debt instrument, stated interest rate			5.50%
Deferred financing cost						400,000		$ 400,000
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		1,700,000.0
Debt Instrument, Convertible, Carrying Amount of Equity Component						$ 1,200,000		$ 1,200,000
Maximum equity owned by Investor		4.985%
Line of Credit Facility, Increase (Decrease), Net				5,000,000
Exit fee upon termination		$ 6,100,000		11,100,000
Commitment reduction		$ 10,000,000
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		251,571
Deerfield ELGX Revolver, LLC \| Revolving loan facility
Debt Instrument [Line Items]
Debt instrument face amount			$ 120,000,000
Global liquidity requirement			$ 17,500,000.0	$ 22,500,000.0
Waterfall loans due			16.67%							33.33%
Remainder of the first out water fall loans			50.00%
Gain (loss) on extinguishment of debt					$ (2,300,000)
Optional stock payment for interest removed \| shares						250,000		250,000
Maximum \| Term loan facility \| Term Loan [Member]
Debt Instrument [Line Items]
Interest Expense, Debt								$ 32,200,000
Maximum \| Convertible notes \| Convertible Senior Notes Due 2020
Debt Instrument [Line Items]
Periodic payment, interest								800,000
Maximum \| Deerfield ELGX Revolver, LLC
Debt Instrument [Line Items]
Mandatory conversion of shares		$ 25,000,000.0
Minimum \| Term loan facility \| Term Loan [Member]
Debt Instrument [Line Items]
Interest Expense, Debt								5,000,000
Minimum \| Convertible notes \| Convertible Senior Notes Due 2020
Debt Instrument [Line Items]
Periodic payment, interest								$ 700,000