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Deferred Shares (Details) - GBP (£) £ / shares in Units, £ in Millions | Jun. 30, 2026 | Dec. 31, 2025
--- | --- | ---
Equity [Abstract] |  |
Ordinary shares, liquidation preference | £ 1.0 |
Deferred shares, nominal value (in gbp per share) | £ 1.00 | £ 1

X
- Definition Face amount or stated value per share of deferred stock. + References No definition available. + Details
Name: | brns_DeferredStockParOrStatedValuePerShare
Namespace Prefix: | brns_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition The amount of liquidation preference on ordinary shares to be paid after which the deferred shares have the entitlement to receive out of the assets of the Company. + References No definition available. + Details
Name: | brns_OrdinarySharesLiquidationPreference
Namespace Prefix: | brns_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_EquityAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration