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Share-Based Compensation - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions	6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Options granted (in shares)	1,470,812	1,951,377
Weighted-average grant date fair value of options granted (in usd per share)	$ 0.85	$ 2.71
Weighted average exercise price of options granted (in usd per share)	$ 1.00	$ 3.41
Options forfeited (in shares)	1,016,357	229,430
Options outstanding (in shares)	7,625,728	7,779,884
Weighted average exercise price of options outstanding (in usd per share)	$ 5.30	$ 6.19
Unrecognized compensation cost related to options	$ 2.0
Stock options
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Weighted-average period over which unrecognized compensation cost is expected to be recognized	2 years
Barinthus Biotherapeutics plc Share Award Plan 2021 | Restricted share units, options, share appreciation rights and restricted shares
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Percentage of issued and outstanding ordinary shares available for issuance under the Plan	4.00%

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