Debt - Liability Related To Sale of Future Royalties (Details) - USD ($) $ in Thousands, shares in Millions		3 Months Ended
	Jan. 07, 2018	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Common stock		$ 2,139		$ 2,125
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	274,700		261,200
Common stock	$ 67,800
Annual interest rate in calculating liability related to sale of future royalties	21.00%
Period which company will accrete the liability	20 years
Interest expense recognized		13,500	$ 10,000
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		274,706	231,257	$ 261,224	$ 221,295
Interest expense recognized		$ 13,482	$ 9,962