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Commitments and Contingencies - Additional Information (Detail) - USD ($)	Mar. 31, 2023	Dec. 31, 2022
Commitments And Contingencies [Line Items]
Accrued termination charges	$ 0
Accrued Research and Development Liabilities
Commitments And Contingencies [Line Items]
Accrued exit fees		$ 3,300,000
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

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Namespace Prefix:	bbio_
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X

- Definition

Accrued exit fees.

+ References

No definition available.

+ Details

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

X

- Definition

Accrued termination charges.

+ References

No definition available.

+ Details

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

X

- Definition

Commitments and Contingencies.

+ References

No definition available.

+ Details

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

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- Details

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Namespace Prefix:
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Period Type:

X

- Details

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Period Type: