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CONDENSED STATEMENTS OF CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY (DEFICIT) (Parenthetical) (Unaudited) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2025
Underwriting discounts and commissions and offering costs | $ 21.7 | $ 21.7
Offering costs | $ 1.4 | $ 1.4

X
- Definition Stock offering costs. + References No definition available. + Details
Name: | bbnx_StockOfferingCosts
Namespace Prefix: | bbnx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Underwriting discounts and commissions and offering costs. + References No definition available. + Details
Name: | bbnx_UnderwritingDiscountsAndCommissionsAndOfferingCosts
Namespace Prefix: | bbnx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration