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Noncontrolling Interests - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Noncontrolling Interest [Abstract]
Adjustments of carrying value of noncontrolling interest additional paid-in capital	$ (2.8)	$ (0.3)

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- Definition

Adjustments of carrying value of noncontrolling interest additional paid-in capital.

+ References

No definition available.

+ Details

Name:	bbio_AdjustmentsOfCarryingValueOfNoncontrollingInterestAdditionalPaidInCapital
Namespace Prefix:	bbio_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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- References

No definition available.

+ Details

Name:	us-gaap_NoncontrollingInterestAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration