Goodwill and Intangible Assets - Gross Carrying Amounts and Net Book Values of Intangible Assets (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 3,290,445	$ 3,292,501
Accumulated Amortization	(1,004,319)	(990,850)
Total	2,286,126	2,301,651
Indefinite-lived Intangible Assets [Line Items]
Gross Carrying Amount - Total Intangible Assets	3,290,445	3,431,827
Net Book Value - Total Intangible Assets	2,286,126	2,440,977
Acquired IPR&D assets
Indefinite-lived Intangible Assets [Line Items]
In-process research and development	0	139,326
Impairment of intangible assets	$ 136,100
Acquired developed technologies
Finite-Lived Intangible Assets [Line Items]
Remaining Weighted- Average Useful Life (In years)	12 years 10 months 24 days
Gross Carrying Amount	$ 3,275,569	3,166,485
Accumulated Amortization	(989,443)	(864,834)
Total	$ 2,286,126	2,301,651
Manufacturing contracts
Finite-Lived Intangible Assets [Line Items]
Remaining Weighted- Average Useful Life (In years)	0 years
Gross Carrying Amount	$ 11,987	12,025
Accumulated Amortization	(11,987)	(12,025)
Total	$ 0	0
Trademarks
Finite-Lived Intangible Assets [Line Items]
Remaining Weighted- Average Useful Life (In years)	0 years
Gross Carrying Amount	$ 2,889	2,890
Accumulated Amortization	(2,889)	(2,890)
Total	$ 0	0
Priority review voucher
Finite-Lived Intangible Assets [Line Items]
Remaining Weighted- Average Useful Life (In years)	0 years
Gross Carrying Amount	$ 0	111,101
Accumulated Amortization	0	(111,101)
Total	0	$ 0
EU Marketing Authorization Of Sunosi
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	13,000
FDA Approval Of Zepzelca
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 100,000