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Debt instrument measurement input after change.

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- Definition

Fair value of financial instruments.

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Note payable, percentage of interest rate change.

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Probability of achievement of regulatory approval, percentage

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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
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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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- Definition

Weighted average discount rate for operating lease calculated at point in time.

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Reference 1: http://www.xbrl.org/2003/role/exampleRef
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Fair Value of Financial Instruments - Fair Value of Financial Instruments (Parenthetical) (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)	Jul. 08, 2024
Fair Value Of Financial Instruments [Line Items]
Operating lease weighted average discount rate	7.60%	7.30%	7.25%
Senior Convertible Notes
Fair Value Of Financial Instruments [Line Items]
Note payable, percentage of hypothetical yield	5	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	40.3	49.5
Senior Convertible Notes \| Minimum
Fair Value Of Financial Instruments [Line Items]
Financial liabilities fair value	$ 39.0	$ 46.2
Senior Convertible Notes \| Maximum
Fair Value Of Financial Instruments [Line Items]
Financial liabilities fair value	$ 39.5	$ 47.6
Milestone Rights \| Risk-Free Rate
Fair Value Of Financial Instruments [Line Items]
Note payable, fair value key inputs	3.94	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	43
Milestone Rights \| Period
Fair Value Of Financial Instruments [Line Items]
Note payable, fair value key inputs	7	7
Milestone Rights \| Credit Risk
Fair Value Of Financial Instruments [Line Items]
Note payable, fair value key inputs	10	11
Milestone 1
Fair Value Of Financial Instruments [Line Items]
Financial liabilities fair value	$ 23.7
Probability of Achievement of Regulatory Approval, Percentage	85.00%
Change In Estimate Of Probability And Discount Rate	2.00%
Operating lease weighted average discount rate	10.00%
Milestone 1 \| Minimum
Fair Value Of Financial Instruments [Line Items]
Financial liabilities fair value	$ 24.7
Milestone 1 \| Maximum
Fair Value Of Financial Instruments [Line Items]
Financial liabilities fair value	$ 22.7
Milestone 2
Fair Value Of Financial Instruments [Line Items]
Note payable, fair value key inputs	25.2
Financial liabilities fair value	$ 2.6
Change In Estimate Of Probability And Discount Rate	2.00%
Operating lease weighted average discount rate	10.00%
Milestone 2 \| Minimum
Fair Value Of Financial Instruments [Line Items]
Financial liabilities fair value	$ 2.6
Milestone 2 \| Maximum
Fair Value Of Financial Instruments [Line Items]
Financial liabilities fair value	$ 2.7
Contingent Milestone Liability \| Volatility
Fair Value Of Financial Instruments [Line Items]
Note payable, fair value key inputs		45
Financing Liability
Fair Value Of Financial Instruments [Line Items]
Note payable, percentage of hypothetical yield	7	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	$ 106.7	$ 103.1
Financing Liability \| Maximum
Fair Value Of Financial Instruments [Line Items]
Financial liabilities fair value	$ 140.6	$ 135.2
Liability for Sale of Future Royalties
Fair Value Of Financial Instruments [Line Items]
Note payable, percentage of hypothetical yield	8	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	$ 148.3	$ 137.9
Liability for Sale of Future Royalties \| Maximum
Fair Value Of Financial Instruments [Line Items]
Financial liabilities fair value	$ 192.3	$ 180.0