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Commitments and Contingencies - Additional Information (Detail) - USD ($) | Mar. 31, 2023 | Dec. 31, 2022
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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 |

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- 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

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- Definition Accrued exit fees. + References No definition available. + Details
Name: | bbio_AccruedExitFees
Namespace Prefix: | bbio_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- 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 Commitments and Contingencies. + References No definition available. + Details
Name: | bbio_CommitmentsAndContingenciesLineItems
Namespace Prefix: | bbio_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_BalanceSheetLocationAxis=bbio_AccruedResearchAndDevelopmentLiabilitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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