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Fair Value of Financial Instruments (Detail) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015
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Warrant Liability |  |
Financial liabilities: |  |
Financial liabilities fair value | $ 7.4 |
Carrying Value |  |
Financial liabilities: |  |
Financial liabilities fair value | 115.2 | $ 155.6
Carrying Value | Sanofi-Aventis Deutschland GmbH |  |
Financial liabilities: |  |
Financial liabilities fair value |  | 44.5
Carrying Value | Warrant Liability |  |
Financial liabilities: |  |
Financial liabilities fair value | 7.4 |
Carrying Value | Milestone Rights Liability |  |
Financial liabilities: |  |
Financial liabilities fair value | 8.9 | 8.9
Carrying Value | Senior Convertible Notes | Convertible Debt Securities |  |
Financial liabilities: |  |
Financial liabilities fair value | 27.6 | 27.6
Carrying Value | Facility Financing Obligation |  |
Financial liabilities: |  |
Financial liabilities fair value | 71.3 | 74.6
Estimate of Fair Value Measurement |  |
Financial liabilities: |  |
Financial liabilities fair value | 123.2 | 150.6
Estimate of Fair Value Measurement | Sanofi-Aventis Deutschland GmbH |  |
Financial liabilities: |  |
Financial liabilities fair value |  | 36.5
Estimate of Fair Value Measurement | Warrant Liability |  |
Financial liabilities: |  |
Financial liabilities fair value | 7.4 |
Estimate of Fair Value Measurement | Milestone Rights Liability |  |
Financial liabilities: |  |
Financial liabilities fair value | 18.4 | 14.4
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 3 |  |
Financial liabilities: |  |
Financial liabilities fair value | 123.2 | 150.6
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 3 | Sanofi-Aventis Deutschland GmbH |  |
Financial liabilities: |  |
Financial liabilities fair value |  | 36.5
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 3 | Warrant Liability |  |
Financial liabilities: |  |
Financial liabilities fair value | 7.4 |
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 3 | Milestone Rights Liability |  |
Financial liabilities: |  |
Financial liabilities fair value | 18.4 | 14.4
Estimate of Fair Value Measurement | Senior Convertible Notes | Convertible Debt Securities |  |
Financial liabilities: |  |
Financial liabilities fair value | 22.9 | 21.3
Estimate of Fair Value Measurement | Senior Convertible Notes | Fair Value, Inputs, Level 3 | Convertible Debt Securities |  |
Financial liabilities: |  |
Financial liabilities fair value | 22.9 | 21.3
Estimate of Fair Value Measurement | Facility Financing Obligation |  |
Financial liabilities: |  |
Financial liabilities fair value | 74.5 | 78.4
Estimate of Fair Value Measurement | Facility Financing Obligation | Fair Value, Inputs, Level 3 |  |
Financial liabilities: |  |
Financial liabilities fair value | $ 74.5 | $ 78.4

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- Definition Fair value of financial obligations, including, but not limited to, debt instruments, derivative liabilities, federal funds purchased and sold under agreements to repurchase, securities loaned or sold under agreements to repurchase, financial instruments sold not yet purchased, guarantees, line of credit, loans and notes payable, servicing liability, and trading liabilities. + References No definition available. + Details
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