Debt - Liability Related To Sale of Future Royalties (Details) - USD ($) $ in Thousands, shares in Millions		3 Months Ended
	Jan. 07, 2018	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Debt Instrument [Line Items]
Common stock		$ 1,915		$ 1,905
RPI Finance Trust | Funding agreement
Debt Instrument [Line Items]
Payments for future royalties	$ 175,000
Royalty purchase agreement arrangements consideration	250,000
Liability related to sale of future royalties	182,200	231,200		221,200
Common stock	$ 67,800
Annual interest rate in calculating liability related to sale of future royalties	18.00%
Period which company will accrete the liability	20 years
Interest expense recognized		10,000	$ 10,600
Private placement | RPI Finance Trust | Funding agreement
Debt Instrument [Line Items]
Stock issued during period (in shares)	4.4
Sale of stock, consideration received on transaction	$ 75,000
Royalty Arrangement [Member] | RPI Finance Trust
Debt Instrument [Line Items]
Liability related to sale of future royalties		231,257		$ 221,295
Interest expense recognized		$ 9,962