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Summary of Significant Accounting Policies - Research and Development Incentives (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Accounting Policies [Abstract]
Research and development incentives	$ 2,000	$ 3,983

X

- Definition

Represents the research and development incentives (expenses) for the period.

+ References

No definition available.

+ Details

Name:	brns_ResearchAndDevelopmentIncentiveIncomeExpense
Namespace Prefix:	brns_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

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