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Share-Based Compensation - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 01, 2025 | Apr. 08, 2021 | Oct. 31, 2025 | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2018
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |
Shares available for future grants (in shares) |  |  |  | 5,976,157 | 7,285,275 |
Number of shares reserved for issuance (in shares) |  |  |  | 9,224,762 |  |
Weighted-average grant date fair value (in usd per share) |  |  |  | $ 0.85 | $ 2.66 |
Aggregate intrinsic value of stock options exercised |  |  |  | $ 200 | $ 400 |
Unrecognized compensation cost related to options |  |  |  | 600 | 3,100 |
Share based compensation expense |  |  |  | $ 468 | 4,709 |
RSU's |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |
Vesting period |  |  | 7 days |  |  |
Weighted-average period over which unrecognized compensation cost is expected to be recognized |  |  |  | 8 months 12 days |  |
Awards granted (in shares) |  |  | 886,018 | 886,018 |  |
Grant fair value of awards |  |  | $ 1,300 |  |  |
Share based compensation expense |  |  |  | $ 500 | $ 0 |
Unrecognized compensation expense |  |  |  | $ 800 |  |
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 |  |  |  | 1 year 5 months 1 day | 1 year 5 months 15 days |
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] |  |  |  |  |  |
Shares available for issuance (in shares) |  | 3,675,680 |  |  |  |
Percentage of issued and outstanding ordinary shares available for issuance |  | 4.00% |  |  |  |
Additional number of shares available for issuance (in shares) | 1,609,386 |  |  |  |  |
Expiration period |  | 10 years |  |  |  |
Vesting period |  | 3 years |  |  |  |
Shares available for future grants (in shares) |  |  |  | 3,248,605 | 1,906,080 |
Enterprise Management Incentive Share Option Scheme |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |
Vesting period |  |  |  |  |  | 3 years
Expiration term |  |  |  |  |  | 10 years
Enterprise Management Incentive Share Option Scheme | RSU's |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |
Number of shares reserved for issuance (in shares) |  |  |  |  |  | 3,530,634

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