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Fair Value of Financial Instruments - Fair Value of Financial Instruments (Detail) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
MidCap Credit Facility
Financial liabilities:
Financial liabilities fair value	$ 52.7	$ 55.4
Senior Convertible Notes
Financial liabilities:
Financial liabilities fair value	209.7
Mann Group Convertible Notes
Financial liabilities:
Financial liabilities fair value	42.2	52.2
Mann Group Non-Convertible Notes
Financial liabilities:
Financial liabilities fair value	31.5	26.7
PPP Loan
Financial liabilities:
Financial liabilities fair value	4.8	4.7
Milestone Rights Liability
Financial liabilities:
Financial liabilities fair value	12.6	19.8
2024 Convertible Notes
Financial liabilities:
Financial liabilities fair value		7.0
Mann Group Promissory Notes
Financial liabilities:
Financial liabilities fair value		78.9
Carrying Value | MidCap Credit Facility
Financial liabilities:
Financial liabilities fair value	49.4	49.3
Carrying Value | Senior Convertible Notes
Financial liabilities:
Financial liabilities fair value	222.9
Carrying Value | Mann Group Convertible Notes
Financial liabilities:
Financial liabilities fair value	18.4	28.0
Carrying Value | Mann Group Non-Convertible Notes
Financial liabilities:
Financial liabilities fair value	35.1	35.1
Carrying Value | PPP Loan
Financial liabilities:
Financial liabilities fair value	4.9	4.9
Carrying Value | Milestone Rights Liability
Financial liabilities:
Financial liabilities fair value	7.3	7.3
Carrying Value | 2024 Convertible Notes
Financial liabilities:
Financial liabilities fair value		5.0
Carrying Value | Mann Group Promissory Notes
Financial liabilities:
Financial liabilities fair value		63.0
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 3 | MidCap Credit Facility
Financial liabilities:
Financial liabilities fair value	52.7	55.4
Estimate of Fair Value Measurement | Senior Convertible Notes | Fair Value, Inputs, Level 3
Financial liabilities:
Financial liabilities fair value	209.7
Estimate of Fair Value Measurement | Mann Group Convertible Notes | Fair Value, Inputs, Level 3
Financial liabilities:
Financial liabilities fair value	42.2
Estimate of Fair Value Measurement | Mann Group Non-Convertible Notes | Fair Value, Inputs, Level 3
Financial liabilities:
Financial liabilities fair value	31.5
Estimate of Fair Value Measurement | PPP Loan | Fair Value, Inputs, Level 3
Financial liabilities:
Financial liabilities fair value	4.8	4.7
Estimate of Fair Value Measurement | Milestone Rights Liability | Fair Value, Inputs, Level 3
Financial liabilities:
Financial liabilities fair value	$ 12.6	19.8
Estimate of Fair Value Measurement | 2024 Convertible Notes | Fair Value, Inputs, Level 3
Financial liabilities:
Financial liabilities fair value		7.0
Estimate of Fair Value Measurement | Mann Group Promissory Notes | Fair Value, Inputs, Level 3
Financial liabilities:
Financial liabilities fair value		$ 78.9

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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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