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Acquisitions (Details) $ / shares in Units, $ in Thousands, € in Millions												1 Months Ended				3 Months Ended			9 Months Ended		12 Months Ended
	Sep. 22, 2026 USD ($)	Jul. 21, 2025 USD ($)	Apr. 01, 2025 USD ($)	Jul. 03, 2024 USD ($)	Jul. 03, 2024 EUR (€)	Jul. 02, 2024 USD ($)	Jun. 27, 2024 EUR (€)	Jun. 15, 2024 USD ($) LicensedAsset	Jan. 08, 2024 USD ($)	Feb. 06, 2023 USD ($)	Nov. 11, 2022 USD ($)	Apr. 30, 2026 USD ($)	Nov. 30, 2025 USD ($)	May 31, 2023 USD ($)	Feb. 28, 2023 USD ($)	Sep. 30, 2026 USD ($) shares	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($) shares	Sep. 30, 2026 USD ($) shares	Sep. 30, 2025 USD ($)	Dec. 31, 2025 USD ($) shares	Dec. 31, 2024 USD ($)	Dec. 31, 2022 USD ($)	Mar. 06, 2024 $ / shares shares	Jan. 22, 2024 $ / shares shares
Asset Acquisition [Line Items]
Additional cash payment required																$ 68,210			$ 68,210		$ 94,339
Research and development																$ 92,764	$ 48,025		170,345	$ 129,828
Decreasing goodwill																			(588)
Increasing accrued expenses																			$ 18,359	(28,932)
Radiopharm Theranostics Limited
Asset Acquisition [Line Items]
Shares owned (in shares) \| shares																537,958,513		149,625,180	537,958,513
Shares Purchase (in shares) \| shares																					388,333,333
Purchase amount in investment in equity securities																		$ 5,000			$ 10,000
Perspective Therapeutics, Inc
Asset Acquisition [Line Items]
Shares acquired (in shares) \| shares																2,938,328			2,938,328
Subsidiary, ownership percentage, noncontrolling owner																								19.90%
Cash from sale of securities																$ 8,600
Realized loss																$ 2,300
Shares owned (in shares) \| shares																8,739,011			8,739,011		11,677,339
Perspective Therapeutics, Inc \| Licenses
Asset Acquisition [Line Items]
Acquisition of exclusive license option									$ 28,000
Perspective Therapeutics, Inc, Fully Diluted Basis
Asset Acquisition [Line Items]
Subsidiary, ownership percentage, noncontrolling owner																								17.35%
Perspective Common Stock
Asset Acquisition [Line Items]
Shares acquired (in shares) \| shares																								60,431,039	56,342,355
Percentage of acquired interest																									11.39%
Share price (in dollars per share) \| $ / shares																								$ 0.95	$ 0.37
Evergreen Theragnostics
Asset Acquisition [Line Items]
Payments to acquire businesses			$ 276,400
Additional cash payment required			25,000
Acquisition and integration related costs																$ 0	5,800		$ 1,900	23,300
Payment of transaction expenses			11,600
Nonrecurring post combination expense																			7,500
Component of consideration transferred			$ 6,100
Business Combination, Separately Recognized Transaction, Acquisition-Related Cost, Expensed, Statement of Income or Comprehensive Income [Extensible Enumeration]			Operating Expenses Before Gain Loss On Sale Of Assets
Pre existing debt			$ 4,300
Additional Milestone Payments \| Evergreen Theragnostics
Asset Acquisition [Line Items]
Additional cash payment required			$ 727,500
Regulatory Milestones \| RM2 Sublicense Agreement [Member]
Asset Acquisition [Line Items]
Payment for acquisitions \| €							€ 10.0
Radiopharm Theranostics Limited
Asset Acquisition [Line Items]
Payment for acquisitions								$ 2,000
Asset acquisition, additional milestone payments								$ 20,000
Number of licensed asset acquired \| LicensedAsset								2
Radiopharm Theranostics Limited \| Sales Milestones
Asset Acquisition [Line Items]
Asset acquisition, additional milestone payments								$ 6,500
Life Molecular Imaging, RM2 Technology
Asset Acquisition [Line Items]
Research and development																					$ 11,200	$ 36,000
Payment for acquisitions				$ 35,000		$ 1,000
Contingent regulatory and development milestones maximum amount \| €					€ 45.0
Contingent regulatory and development milestones minimum amount \| €					82.5
Life Molecular Imaging, RM2 Technology \| Sales Milestones
Asset Acquisition [Line Items]
Asset acquisition, additional milestone payments \| €					280.0
Life Molecular Imaging, RM2 Technology \| Regulatory Milestones
Asset Acquisition [Line Items]
Asset acquisition, additional milestone payments \| €					€ 127.5
Lantheus Biosciences Ltd
Asset Acquisition [Line Items]
Acquisition and integration related costs																$ 1,900	$ 22,200		5,700	$ 27,600
Payment for acquisitions		$ 355,200
Payment of working capital settlement in business combination													$ 2,300
Additional working capital settlement received												$ 300
Decreasing goodwill																			300
Increasing accrued expenses																			200
Other current liabilities																			200
Decreasing deferred tax liability																			500
Total adjustments to purchase consideration																			$ 2,600
Asset acquisition, additional milestone payments		$ 400,000
Biopharma Global Inc .
Asset Acquisition [Line Items]
Research and development																							$ 10,000
Regulatory milestone payment	$ 10,000
Additional milestone payments	24,500
Potential sales milestone payments	$ 275,000
Royalty payments percentage	15.00%
Payment for acquisitions											$ 10,000
Cerveau Technologies, Inc
Asset Acquisition [Line Items]
Payments to acquire businesses										$ 1,300
Regulatory milestone payment										13,000
Additional milestone payments										33,000
Payment for acquisitions										$ 35,300				$ 10,000
Cerveau Technologies, Inc \| Sales Milestones
Asset Acquisition [Line Items]
Asset acquisition, additional milestone payments															$ 1,200,000