Revenue from Contracts with Customers - Schedule of Manufacturing and Royalty Revenues (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Disaggregation Of Revenue [Line Items]
Total revenues	$ 223,102	$ 225,150
Manufacturing Revenue
Disaggregation Of Revenue [Line Items]
Total revenues	30,947	37,591
Manufacturing Revenue | AMPYRA/ FAMPYRA
Disaggregation Of Revenue [Line Items]
Total revenues	5,680	13,563
Manufacturing Revenue | RISPERDAL CONSTA
Disaggregation Of Revenue [Line Items]
Total revenues	17,921	17,792
Manufacturing Revenue | Other
Disaggregation Of Revenue [Line Items]
Total revenues	7,346	6,236
Royalty Revenue
Disaggregation Of Revenue [Line Items]
Total revenues	77,968	77,010
Royalty Revenue | INVEGA SUSTENNA/XEPLION and INVEGA TRINZA/TREVICTA
Disaggregation Of Revenue [Line Items]
Total revenues	53,298	46,086
Royalty Revenue | AMPYRA/ FAMPYRA
Disaggregation Of Revenue [Line Items]
Total revenues	6,506	14,696
Royalty Revenue | RISPERDAL CONSTA
Disaggregation Of Revenue [Line Items]
Total revenues	4,385	4,912
Royalty Revenue | Other
Disaggregation Of Revenue [Line Items]
Total revenues	13,779	11,316
Manufacturing and royalty revenues
Disaggregation Of Revenue [Line Items]
Total revenues	108,915	114,601
Manufacturing and royalty revenues | INVEGA SUSTENNA/XEPLION and INVEGA TRINZA/TREVICTA
Disaggregation Of Revenue [Line Items]
Total revenues	53,298	46,086
Manufacturing and royalty revenues | AMPYRA/ FAMPYRA
Disaggregation Of Revenue [Line Items]
Total revenues	12,186	28,259
Manufacturing and royalty revenues | RISPERDAL CONSTA
Disaggregation Of Revenue [Line Items]
Total revenues	22,306	22,704
Manufacturing and royalty revenues | Other
Disaggregation Of Revenue [Line Items]
Total revenues	$ 21,125	$ 17,552