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Ordinary Shares - Additional Information (Details)			12 Months Ended
	Nov. 06, 2023 GBP (£)	Apr. 21, 2021	Dec. 31, 2025 vote
Subsidiary, Sale of Stock [Line Items]
Number of votes per common share (in votes) | vote			1
Percentage of ordinary shares present to exercise preemptive rights			75.00%
Maximum period to exercise preemptive rights			5 years
Maximum aggregate nominal amount of shares authorized to be allotted free from pre-emption rights | £	£ 1,928
IPO
Subsidiary, Sale of Stock [Line Items]
Maximum period to exercise preemptive rights	5 years	5 years	5 years

X

- Definition

The number of votes that each common share is entitled.

+ References

No definition available.

+ Details

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Namespace Prefix:	brns_
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Balance Type:	na
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X

- Definition

Amount of maximum aggregate nominal amount of shares that the board of directors are authorized to allot free from statutory Pre-emption rights.

+ References

No definition available.

+ Details

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Namespace Prefix:	brns_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The minimum percentage of shares required to exercise preemptive rights.

+ References

No definition available.

+ Details

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Namespace Prefix:	brns_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The period allowed to exercise preemptive rights.

+ References

No definition available.

+ Details

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Namespace Prefix:	brns_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type: