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Fair Value of Financial Instruments - Fair Value of Financial Instruments (Detail) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Financial liabilities:
Financial liabilities fair value	$ 118.2	$ 110.6
MidCap Credit Facility
Financial liabilities:
Financial liabilities fair value	39.0	40.0
2024 Convertible Notes
Financial liabilities:
Financial liabilities fair value	4.1	3.7
June 2020 Note
Financial liabilities:
Financial liabilities fair value	2.3	2.3
Mann Group Promissory Notes
Financial liabilities:
Financial liabilities fair value	53.5	46.2
PPP Loan
Financial liabilities:
Financial liabilities fair value	4.4
Milestone Rights Liability
Financial liabilities:
Financial liabilities fair value	14.9	16.4
December 2020 Note
Financial liabilities:
Financial liabilities fair value		2.0
Carrying Value
Financial liabilities:
Financial liabilities fair value	129.0	126.2
Carrying Value | MidCap Credit Facility
Financial liabilities:
Financial liabilities fair value	39.3	38.9
Carrying Value | 2024 Convertible Notes
Financial liabilities:
Financial liabilities fair value	5.0	5.0
Carrying Value | June 2020 Note
Financial liabilities:
Financial liabilities fair value	2.5	2.5
Carrying Value | Mann Group Promissory Notes
Financial liabilities:
Financial liabilities fair value	70.0	70.0
Carrying Value | PPP Loan
Financial liabilities:
Financial liabilities fair value	4.9
Carrying Value | Milestone Rights Liability
Financial liabilities:
Financial liabilities fair value	7.3	7.3
Carrying Value | December 2020 Note
Financial liabilities:
Financial liabilities fair value		2.5
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 3
Financial liabilities:
Financial liabilities fair value	118.2	110.6
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 3 | MidCap Credit Facility
Financial liabilities:
Financial liabilities fair value	39.0	40.0
Estimate of Fair Value Measurement | 2024 Convertible Notes | Fair Value, Inputs, Level 3
Financial liabilities:
Financial liabilities fair value	4.1	3.7
Estimate of Fair Value Measurement | June 2020 Note | Fair Value, Inputs, Level 3
Financial liabilities:
Financial liabilities fair value	2.3	2.3
Estimate of Fair Value Measurement | Mann Group Promissory Notes | Fair Value, Inputs, Level 3
Financial liabilities:
Financial liabilities fair value	53.5	46.2
Estimate of Fair Value Measurement | PPP Loan | Fair Value, Inputs, Level 3
Financial liabilities:
Financial liabilities fair value	4.4
Estimate of Fair Value Measurement | Milestone Rights Liability | Fair Value, Inputs, Level 3
Financial liabilities:
Financial liabilities fair value	$ 14.9	16.4
Estimate of Fair Value Measurement | December 2020 Note | Fair Value, Inputs, Level 3
Financial liabilities:
Financial liabilities fair value		$ 2.0

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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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