Revenues (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018
Revenues
Total revenues	$ 497,857	$ 382,282
Product revenues, net
Revenues
Total revenues	396,249	334,505
JAKAFI
Revenues
Total revenues	375,611	313,720
ICLUSIG
Revenues
Total revenues	20,638	20,785
Product royalty revenues
Revenues
Total revenues	61,608	47,716
JAKAVI Royalty Revenues
Revenues
Total revenues	45,571	41,337
OLUMIANT Royalty Revenues
Revenues
Total revenues	16,037	6,379
Milestone and contract revenues
Revenues
Total revenues	$ 40,000
Other revenues
Revenues
Total revenues		$ 61

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration