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Fair Value of Financial Instruments - Fair Value of Financial Instruments (Detail) - USD ($) $ in Millions | Jun. 30, 2025 | Dec. 31, 2024
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Carrying Amount | Senior Convertible Notes |  |
Financial liabilities: |  |
Total financial liabilities fair value | $ 36.2 | $ 36.1
Carrying Amount | Milestone Rights |  |
Financial liabilities: |  |
Total financial liabilities fair value | 2.5 | 3.2
Carrying Amount | Financing Liability |  |
Financial liabilities: |  |
Total financial liabilities fair value | 103.7 | 103.9
Carrying Amount | Liability for Sale of Future Royalties |  |
Financial liabilities: |  |
Total financial liabilities fair value | 150.6 | 149.6
Estimate of Fair Value Measurement | Senior Convertible Notes | Fair Value, Inputs, Level 3 |  |
Financial liabilities: |  |
Total financial liabilities fair value | 36.0 | 46.9
Estimate of Fair Value Measurement | Milestone Rights | Fair Value, Inputs, Level 3 |  |
Financial liabilities: |  |
Total financial liabilities fair value | 16.5 | 19.2
Estimate of Fair Value Measurement | Financing Liability | Fair Value, Inputs, Level 3 |  |
Financial liabilities: |  |
Total financial liabilities fair value | 116.8 | 117.4
Estimate of Fair Value Measurement | Liability for Sale of Future Royalties | Fair Value, Inputs, Level 3 |  |
Financial liabilities: |  |
Total financial liabilities fair value | $ 157.8 | $ 156.7

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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 Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 28 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-28 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-10 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2E -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2E + Details
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