Long-Term Debt (Narrative) (Details) - USD ($)	1 Months Ended	3 Months Ended	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2018	Jun. 30, 2018	Jun. 30, 2017
Long-term debt
Repayments of Notes Payable			$ 57,187,000	$ 6,507,000
FDA Approval Qsymia (PMR and CVOT) Member
Long-term debt
Contractual Obligation Term		5 years
Minimum | FDA Approval Qsymia (PMR and CVOT) Member
Long-term debt
Contractual Obligation	$ 180,000,000	$ 180,000,000	180,000,000
Maximum | FDA Approval Qsymia (PMR and CVOT) Member
Long-term debt
Contractual Obligation	$ 220,000,000	220,000,000	$ 220,000,000
Convertible Senior Notes Due 2020
Long-term debt
Extinguishment of Debt, Amount		60,000,000
Repayments of Notes Payable		$ 51,000,000
Senior Secured Note Athyrium Due 2024 Member
Long-term debt
Long-term Debt, Weighted Average Interest Rate, at Point in Time	11.30%	11.30%	11.30%
Senior Secured Note Athyrium Due 2024 Member | Athyrium Capital Management Affiliates Member
Long-term debt
Senior Notes	$ 110,000,000	$ 110,000,000	$ 110,000,000
Debt Instrument, Interest Rate, Stated Percentage	10.375%	10.375%	10.375%
Class of Warrant or Right, Number of Securities Called by Warrants or Rights	3,300,000	3,300,000	3,300,000
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed	99.00%
Interest rate (as a percent)	10.375%	10.375%	10.375%
Senior Secured Note Athyrium Due 2024 Member | Warrants Issued | Athyrium Capital Management Affiliates Member
Long-term debt
Fair Value Assumptions, Expected Term	6 years
Fair Value Assumptions, Expected Volatility Rate	62.70%
Fair Value Assumptions, Risk Free Interest Rate	2.83%
Fair Value Assumptions, Expected Dividend Rate	0.00%
Additional Senior Secured Note Athyrium Due 2024 Member | Athyrium Capital Management Affiliates Member
Long-term debt
Senior Notes	$ 10,000,000	$ 10,000,000	$ 10,000,000
Debt Instrument, Interest Rate, Stated Percentage	10.375%	10.375%	10.375%
Debt Instrument, Term	12 months
Interest rate (as a percent)	10.375%	10.375%	10.375%
Remaining expected life	12 months