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Summary of Carrying Values Estimated Fair Values of Notes and Facility Financing Obligation and Sanofi Loan Facility (Detail) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Sanofi-Aventis Deutschland GmbH
Convertible Debt [Line Items]
Carrying value	$ 63.5	$ 44.5
Estimated fair value	48.2	36.5
Senior convertible notes due August 15, 2015 | Convertible Debt Securities
Convertible Debt [Line Items]
Carrying value	27.6	27.6
Estimated fair value	21.8	21.3
Facility financing obligation
Convertible Debt [Line Items]
Carrying value	75.0	74.6
Estimated fair value	$ 79.4	$ 78.4

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- Definition

Convertible Debt [Line Items]

+ References

No definition available.

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Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 20
-Article 5

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 16
-Article 9

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- Definition

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13433-108611

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13476-108611

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