v3.25.4

Business - Additional information (Detail) | 6 Months Ended
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Dec. 31, 2025
Schedule Of Entities In Control [Abstract] |
Entity Incorporation Date Of Incorporation | Nov. 22, 2019

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- References No definition available. + Details
Name: | bntc_ScheduleOfEntitiesInControlAbstract
Namespace Prefix: | bntc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Date when an entity was incorporated + References No definition available. + Details
Name: | dei_EntityIncorporationDateOfIncorporation
Namespace Prefix: | dei_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration