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Summary of Significant Accounting Policies - Research and Development Incentives (Details) - USD ($) $ in Thousands | 12 Months Ended
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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