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Commitments and Contingencies - Additional Information (Details) - USD ($)	Jun. 30, 2025	Dec. 31, 2024
Commitments And Contingencies [Line Items]
Accrued termination charges	$ 0	$ 0
Aggregate minimum commitment	76,800,000
Performance-Based Milestone Awards
Commitments And Contingencies [Line Items]
Accrual for milestones not probable	$ 0

X

- Definition

Accrual for milestones not probable.

+ References

No definition available.

+ Details

Name:	bbio_AccrualForMilestonesNotProbable
Namespace Prefix:	bbio_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Accrued termination charges.

+ References

No definition available.

+ Details

Name:	bbio_AccruedTerminationCharges
Namespace Prefix:	bbio_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Aggregate minimum commitment.

+ References

No definition available.

+ Details

Name:	bbio_AggregateMinimumCommitment
Namespace Prefix:	bbio_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Commitments and Contingencies.

+ References

No definition available.

+ Details

Name:	bbio_CommitmentsAndContingenciesLineItems
Namespace Prefix:	bbio_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_AwardTypeAxis=bbio_PerformanceBasedMilestoneAwardsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: