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Intangible Assets	3 Months Ended
Intangible Assets	Mar. 31, 2026
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible Assets	Intangible Asset In connection with the May 2018 acquisition of F-star Gamma Limited ("F-star Gamma") and related license arrangements, the Company is obligated to make contingent payments upon the achievement of specified preclinical, clinical, regulatory and commercial milestones. Additional information regarding these arrangements is included in Note 4, “Acquisition, License Agreement and Research and Development Funding Collaboration Agreement,” to the consolidated financial statements included in the Company’s 2025 Annual Report on Form 10-K. In March 2026, following the U.S. Food and Drug Administration’s accelerated approval of AVLAYAH, a $36.0 million milestone payment became due under this arrangement. The amount was capitalized as an intangible asset and will be amortized on a straight-line basis over its estimated useful life. The amount is included in accounts payable in the Condensed Consolidated Balance Sheet as of March 31, 2026, and is expected to be fully paid by Q3 2026. In addition to the U.S. regulatory milestone described above, the Company may be required to make additional contingent consideration payments of up to $174.0 million, composed of $24.0 million due upon regulatory approval of AVLAYAH in the European Union, and up to $150.0 million in commercial contingent payments.