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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