XML 104 R85.htm IDEA: XBRL DOCUMENT
v3.25.4

Commitments and Contingencies - Additional Information (Details) $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
Jun. 14, 2022 USD ($) ft² | Sep. 03, 2021 USD ($) ft² | Dec. 31, 2025 USD ($) | Dec. 31, 2024 USD ($)
Other Commitments [Line Items] |  |  |  |
Right-of-use asset |  |  | $ 1,638 | $ 4,384
Operating lease right-of-use asset impairment charge |  |  | 400 | 2,600
Transaction-related fees |  |  | 2,800 | $ 0
Oxfordshire |  |  |  |
Other Commitments [Line Items] |  |  |  |
Size of space under lease agreement (in square feet) | ft² |  | 31,000 |  |
Refundable security deposit |  | $ 700 |  |
Right-of-use asset |  |  | $ 0 |
Maryland |  |  |  |
Other Commitments [Line Items] |  |  |  |
Size of space under lease agreement (in square feet) | ft² | 19,700 |  |  |
Refundable security deposit | $ 200 |  |  |
Additional lease term | 5 years |  |  |
Leasehold improvement expense | $ 3,500 |  |  |
In-License Agreements | Minimum |  |  |  |
Other Commitments [Line Items] |  |  |  |
Percentage of future royalties for direct sales of a covered product |  |  | 1.00% |
Net payments received for allowable sublicenses of technology developed |  |  | 3.00% |
In-License Agreements | Maximum |  |  |  |
Other Commitments [Line Items] |  |  |  |
Percentage of future royalties for direct sales of a covered product |  |  | 5.00% |
Net payments received for allowable sublicenses of technology developed |  |  | 7.00% |

X
- Definition Term of lessee's operating lease extended, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | brns_LesseeOperatingLeaseExtendedTerm
Namespace Prefix: | brns_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the information pertaining to number of Square Feet Under Lease Agreement. + References No definition available. + Details
Name: | brns_NumberOfSquareFeetUnderLeaseAgreement
Namespace Prefix: | brns_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of future royalties for direct sales of a covered product under the In-License Agreements. + References No definition available. + Details
Name: | brns_PercentageOfFutureRoyaltiesForDirectSalesOfCoveredProductLicenseAgreement
Namespace Prefix: | brns_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of net payments received for allowable sublicenses of technology developed under the In-License Agreements. + References No definition available. + Details
Name: | brns_PercentageOfNetPaymentsReceivedForAllowableSublicensesOfTechnologyDevelopedLicenseAgreement
Namespace Prefix: | brns_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of expense for acquisition-related cost incurred to effect business combination. Includes, but is not limited to, finder's fee; advisory, legal, accounting, valuation, and other professional and consulting fees; and general administrative cost, including cost of maintaining internal acquisition department. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 805 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479328/805-10-50-7 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 805 -SubTopic 10 -Name Accounting Standards Codification -Section 25 -Paragraph 23 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479405/805-10-25-23 + Details
Name: | us-gaap_BusinessCombinationAcquisitionRelatedCosts
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount before accumulated depreciation of additions or improvements to assets held under a lease arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 360 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482099/360-10-50-1 + Details
Name: | us-gaap_LeaseholdImprovementsGross
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of loss from impairment of right-of-use asset from operating lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 25 -Paragraph 6 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479365/842-20-25-6 + Details
Name: | us-gaap_OperatingLeaseImpairmentLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of lessee's right to use underlying asset under operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479041/842-20-45-1 + Details
Name: | us-gaap_OperatingLeaseRightOfUseAsset
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

X
- Definition The amount of an asset, typically cash, provided to a counterparty to provide certain assurance of performance by the entity pursuant to the terms of a written or oral agreement, such as a lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(17)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
Name: | us-gaap_SecurityDeposit
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | srt_StatementGeographicalAxis=brns_OxfordshireMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=stpr_MD
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TypeOfArrangementAxis=brns_InLicenseAgreementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |