License and Other Agreements - Revenue Participation Rights with RPI Finance Trust (Details) - USD ($)	1 Months Ended	3 Months Ended
	Jun. 30, 2018	Mar. 31, 2020	Mar. 31, 2019
License and other agreements
Non-cash interest expense on liability related to sale of future royalties		$ 8,425,000	$ 6,817,000
RPI Funding Agreement
License and other agreements
Proceeds from royalty agreement	$ 100,000,000
Non-cash interest expense on liability related to sale of future royalties		$ 8,425,000	$ 6,817,000
Revenue Participation Right, tranche one | RPI Funding Agreement
License and other agreements
Participation rate for revenue participation right (percent)	2.10%
Revenue Participation Right, tranche one | RPI Funding Agreement | Maximum
License and other agreements
Annual global net sales threshold for revenue participation right	$ 1,500,000,000
Revenue Participation Right, tranche two | RPI Funding Agreement
License and other agreements
Participation rate for revenue participation right (percent)	1.50%