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Fair Value of Financial Instruments (Detail) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Financial liabilities:
Financial liabilities fair value	$ 117.6	$ 123.2
Warrant Liability
Financial liabilities:
Financial liabilities fair value	0.8	7.4
Milestone Rights Liability
Financial liabilities:
Financial liabilities fair value	18.9	18.4
Senior Convertible Notes | Senior Convertible Notes
Financial liabilities:
Financial liabilities fair value	23.1	22.9
Facility Financing Obligation
Financial liabilities:
Financial liabilities fair value	74.8	74.5
Carrying Value
Financial liabilities:
Financial liabilities fair value	109.1	115.2
Carrying Value | Warrant Liability
Financial liabilities:
Financial liabilities fair value	0.8	7.4
Carrying Value | Milestone Rights Liability
Financial liabilities:
Financial liabilities fair value	8.9	8.9
Carrying Value | Senior Convertible Notes | Senior Convertible Notes
Financial liabilities:
Financial liabilities fair value	27.6	27.6
Carrying Value | Facility Financing Obligation
Financial liabilities:
Financial liabilities fair value	71.8	71.3
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 3
Financial liabilities:
Financial liabilities fair value	117.6	123.2
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 3 | Warrant Liability
Financial liabilities:
Financial liabilities fair value	0.8	7.4
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 3 | Milestone Rights Liability
Financial liabilities:
Financial liabilities fair value	18.9	18.4
Estimate of Fair Value Measurement | Senior Convertible Notes | Fair Value, Inputs, Level 3 | Senior Convertible Notes
Financial liabilities:
Financial liabilities fair value	23.1	22.9
Estimate of Fair Value Measurement | Facility Financing Obligation | Fair Value, Inputs, Level 3
Financial liabilities:
Financial liabilities fair value	$ 74.8	$ 74.5

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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.

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