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Fair Value of Financial Instruments - Fair Value of Financial Instruments (Detail) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
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Carrying Amount | MidCap Credit Facility |  |
Financial liabilities: |  |
Total financial liabilities fair value | $ 28.1 | $ 33.0
Carrying Amount | Senior Convertible Notes |  |
Financial liabilities: |  |
Total financial liabilities fair value | 227.2 | 226.9
Carrying Amount | Mann Group Convertible Note |  |
Financial liabilities: |  |
Total financial liabilities fair value | 8.8 | 8.8
Carrying Amount | Milestone Rights |  |
Financial liabilities: |  |
Total financial liabilities fair value | 3.9 | 3.9
Carrying Amount | Contingent Milestone Liability |  |
Financial liabilities: |  |
Total financial liabilities fair value | 0.3 | 0.3
Carrying Amount | Financing Liability |  |
Financial liabilities: |  |
Total financial liabilities fair value | 104.1 | 104.1
Carrying Amount | Liability for Sale of Future Royalties |  |
Financial liabilities: |  |
Total financial liabilities fair value | 148.0 |
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 3 | MidCap Credit Facility |  |
Financial liabilities: |  |
Total financial liabilities fair value | 30.2 | 35.5
Estimate of Fair Value Measurement | Senior Convertible Notes | Fair Value, Inputs, Level 3 |  |
Financial liabilities: |  |
Total financial liabilities fair value | 246.4 | 231.3
Estimate of Fair Value Measurement | Mann Group Convertible Note | Fair Value, Inputs, Level 3 |  |
Financial liabilities: |  |
Total financial liabilities fair value | 17.1 | 14.4
Estimate of Fair Value Measurement | Milestone Rights | Fair Value, Inputs, Level 3 |  |
Financial liabilities: |  |
Total financial liabilities fair value | 12.8 | 11.9
Estimate of Fair Value Measurement | Contingent Milestone Liability | Fair Value, Inputs, Level 3 |  |
Financial liabilities: |  |
Total financial liabilities fair value | 0.3 | 0.3
Estimate of Fair Value Measurement | Financing Liability | Fair Value, Inputs, Level 3 |  |
Financial liabilities: |  |
Total financial liabilities fair value | 106.7 | $ 106.8
Estimate of Fair Value Measurement | Liability for Sale of Future Royalties | Fair Value, Inputs, Level 3 |  |
Financial liabilities: |  |
Total financial liabilities fair value | $ 159.6 |

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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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