Debt - Liability Related To Sale of Future Royalties (Details) - USD ($) $ in Thousands, shares in Millions		3 Months Ended		9 Months Ended
	Jan. 07, 2018	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Debt Instrument [Line Items]
Common stock		$ 1,920		$ 1,920		$ 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	251,300		251,300		221,300
Common stock	$ 67,800
Annual interest rate in calculating liability related to sale of future royalties	16.00%
Period which company will accrete the liability	20 years
Interest expense recognized		9,600	$ 9,800	30,000	$ 29,600
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 | RPI Finance Trust
Debt Instrument [Line Items]
Liability related to sale of future royalties		$ 251,317		251,317		$ 221,295
Interest expense recognized				$ 30,022