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Fair Value of Financial Instruments (Detail) - USD ($) $ in Millions | Mar. 31, 2018 | Dec. 31, 2017
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Financial liabilities: |  |
Financial liabilities fair value | $ 156.6 | $ 93.5
Milestone Rights Liability |  |
Financial liabilities: |  |
Financial liabilities fair value | 17.8 | 19.1
Carrying Value |  |
Financial liabilities: |  |
Financial liabilities fair value | 149.2 | 86.0
Carrying Value | Milestone Rights Liability |  |
Financial liabilities: |  |
Financial liabilities fair value | 8.9 | 8.9
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 3 |  |
Financial liabilities: |  |
Financial liabilities fair value | 156.6 | 93.5
Estimate of Fair Value Measurement | Milestone Rights Liability | Fair Value, Inputs, Level 3 |  |
Financial liabilities: |  |
Financial liabilities fair value | 17.8 | 19.1
5.75% Senior convertible notes due October 23, 2021 |  |
Financial liabilities: |  |
Financial liabilities fair value | 19.9 | 19.8
5.75% Senior convertible notes due October 23, 2021 | Carrying Value |  |
Financial liabilities: |  |
Financial liabilities fair value | 24.4 | 24.4
5.75% Senior convertible notes due October 23, 2021 | Estimate of Fair Value Measurement | Fair Value, Inputs, Level 3 |  |
Financial liabilities: |  |
Financial liabilities fair value | 19.9 | 19.8
Facility Financing Obligation |  |
Financial liabilities: |  |
Financial liabilities fair value | 50.1 | 54.6
Facility Financing Obligation | Carrying Value |  |
Financial liabilities: |  |
Financial liabilities fair value | 43.7 | 52.7
Facility Financing Obligation | Estimate of Fair Value Measurement | Fair Value, Inputs, Level 3 |  |
Financial liabilities: |  |
Financial liabilities fair value | 50.1 | $ 54.6
Note Payable to Related Party |  |
Financial liabilities: |  |
Financial liabilities fair value | 68.8 |
Note Payable to Related Party | Carrying Value |  |
Financial liabilities: |  |
Financial liabilities fair value | 72.2 |
Note Payable to Related Party | Estimate of Fair Value Measurement | Fair Value, Inputs, Level 3 |  |
Financial liabilities: |  |
Financial liabilities fair value | $ 68.8 |

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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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