v3.26.1

BASIS OF PRESENTATION (Details)	3 Months Ended
BASIS OF PRESENTATION (Details)	Mar. 31, 2026 USD ($) subsidiary $ / shares	Dec. 31, 2025 $ / shares	Sep. 29, 2025
BASIS OF PRESENTATION
Number of wholly owned subsidiaries \| subsidiary	1
Assets	$ 0
Liabilities	$ 0
Common stock, par value \| $ / shares	$ 0.0001	$ 0.0001
Beacon Topco, Inc \| Barinthus Bio shareholders
BASIS OF PRESENTATION
Ownership interest (in percent)			34.00%
Beacon Topco, Inc \| Clywedog stockholders
BASIS OF PRESENTATION
Ownership interest (in percent)			66.00%

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-Paragraph 30
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-30

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The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

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The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

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BEACON TOPCO, INC. 10-Q