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Fair Value of Financial Instruments - Fair Value of Financial Instruments (Parenthetical) (Detail) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2025 USD ($)	Dec. 31, 2024 USD ($)
Senior Convertible Notes
Fair Value Of Financial Instruments [Line Items]
Note payable, percentage of hypothetical yield	7	7.5
Note payable, percentage of interest rate increases (decreases)	2.00%	2.00%
Senior Convertible Notes | Volatility
Fair Value Of Financial Instruments [Line Items]
Note payable, fair value key inputs	59.4	49.5
Senior Convertible Notes | Minimum
Fair Value Of Financial Instruments [Line Items]
Financial liabilities fair value	$ 40.7	$ 46.2
Senior Convertible Notes | Maximum
Fair Value Of Financial Instruments [Line Items]
Financial liabilities fair value	$ 41.3	$ 47.6
Milestone Rights | Risk-Free Rate
Fair Value Of Financial Instruments [Line Items]
Note payable, fair value key inputs	3.9	4.5
Milestone Rights | Dividend Yield
Fair Value Of Financial Instruments [Line Items]
Note payable, fair value key inputs	0	0
Milestone Rights | Volatility
Fair Value Of Financial Instruments [Line Items]
Note payable, fair value key inputs	45	45
Milestone Rights | Period
Fair Value Of Financial Instruments [Line Items]
Note payable, fair value key inputs	6.25	7
Milestone Rights | Credit Risk
Fair Value Of Financial Instruments [Line Items]
Note payable, fair value key inputs	11	11
Financing Liability
Fair Value Of Financial Instruments [Line Items]
Note payable, percentage of hypothetical yield	8	8
Note payable, percentage of interest rate increases (decreases)	2.00%	2.00%
Financing Liability | Minimum
Fair Value Of Financial Instruments [Line Items]
Financial liabilities fair value	$ 102.7	$ 103.1
Financing Liability | Maximum
Fair Value Of Financial Instruments [Line Items]
Financial liabilities fair value	$ 133.3	$ 135.2
Liability for Sale of Future Royalties
Fair Value Of Financial Instruments [Line Items]
Note payable, percentage of hypothetical yield	9	9
Note payable, percentage of interest rate increases (decreases)	2.00%	2.00%
Liability for Sale of Future Royalties | Minimum
Fair Value Of Financial Instruments [Line Items]
Financial liabilities fair value	$ 142.4	$ 137.9
Liability for Sale of Future Royalties | Maximum
Fair Value Of Financial Instruments [Line Items]
Financial liabilities fair value	$ 182.2	$ 180.0

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+ References

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- Definition

Value of input used to measure debt instrument, including, but not limited to, convertible and non-convertible debt.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
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-Section 50
-Paragraph 2
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

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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
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-Section 50
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-11

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
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-Section 50
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-11

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
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-Name Accounting Standards Codification
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-10

Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
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-Name Accounting Standards Codification
-Section 50
-Paragraph 2
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-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

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