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Major Customers, Partnerships and Strategic Alliances - Revenues Recognized under Agreement (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenues:
Total	$ 21,416	$ 8,253	$ 34,053	$ 11,678
Recognition of Upfront Fee [Member]
Revenues:
Total	21,289	7,977	33,840	11,283
Bioverativ Inc [Member]
Revenues:
Total	4,516	3,510	8,898	5,661
Bioverativ Inc [Member] | Recognition of Upfront Fee [Member]
Revenues:
Total	1,184	442	2,338	884
Bioverativ Inc [Member] | Research Services [Member]
Revenues:
Total	$ 3,332	3,068	$ 6,560	4,777
Shire AG [Member]
Revenues:
Total		586		1,277
Shire AG [Member] | Recognition of Upfront Fee [Member]
Revenues:
Total		583		1,167
Shire AG [Member] | Research Services [Member]
Revenues:
Total		$ 3		$ 110

X

- Definition

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.

+ References

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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- References

No definition available.

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