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Fair Value of Financial Instruments - Fair Value of Financial Instruments (Detail) - USD ($) $ in Millions | Sep. 30, 2022 | Dec. 31, 2021 | Nov. 30, 2021
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MidCap Credit Facility |  |  |
Financial liabilities: |  |  |
Financial liabilities fair value | $ 40.7 | $ 40.8 |
Fair Value, Inputs, Level 3 |  |  |
Financial liabilities: |  |  |
Financial liabilities fair value |  |  | $ 103.2
Carrying Value | MidCap Credit Facility |  |  |
Financial liabilities: |  |  |
Financial liabilities fair value | 39.2 | 38.8 |
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 3 | MidCap Credit Facility |  |  |
Financial liabilities: |  |  |
Financial liabilities fair value | 40.7 | 40.8 |
Senior Convertible Notes |  |  |
Financial liabilities: |  |  |
Financial liabilities fair value | 206.1 | 237.5 |
Senior Convertible Notes | Carrying Value |  |  |
Financial liabilities: |  |  |
Financial liabilities fair value | 225.0 | 223.9 |
Senior Convertible Notes | Estimate of Fair Value Measurement | Fair Value, Inputs, Level 3 |  |  |
Financial liabilities: |  |  |
Financial liabilities fair value | 206.1 | 237.5 |
Mann Group Convertible Note |  |  |
Financial liabilities: |  |  |
Financial liabilities fair value | 13.3 | 37.8 |
Mann Group Convertible Note | Carrying Value |  |  |
Financial liabilities: |  |  |
Financial liabilities fair value | 8.8 | 18.4 |
Mann Group Convertible Note | Estimate of Fair Value Measurement | Fair Value, Inputs, Level 3 |  |  |
Financial liabilities: |  |  |
Financial liabilities fair value | 13.3 | 37.8 |
Milestone Rights Liability |  |  |
Financial liabilities: |  |  |
Financial liabilities fair value | 13.0 | 18.1 |
Milestone Rights Liability | Carrying Value |  |  |
Financial liabilities: |  |  |
Financial liabilities fair value | 4.8 | 5.9 |
Milestone Rights Liability | Estimate of Fair Value Measurement | Fair Value, Inputs, Level 3 |  |  |
Financial liabilities: |  |  |
Financial liabilities fair value | 13.0 | $ 18.1 |
Contingent Milestone Liability |  |  |
Financial liabilities: |  |  |
Financial liabilities fair value | 0.8 |  |
Contingent Milestone Liability | Carrying Value |  |  |
Financial liabilities: |  |  |
Financial liabilities fair value | 0.6 |  |
Contingent Milestone Liability | Estimate of Fair Value Measurement | Fair Value, Inputs, Level 3 |  |  |
Financial liabilities: |  |  |
Financial liabilities fair value | $ 0.8 |  |

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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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