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Cash Equivalents and Marketable Securities - Additional Information (Details)	9 Months Ended
	Sep. 30, 2021 USD ($)
Cash And Cash Equivalents [Abstract]
Realized gains or losses on available-for-sale securities	$ 0
Available-for-sale securities, continuous unrealized loss position, more than 12 months	$ 0
Short-term marketable securities contractual maturities	7 months

X

- Definition

Short term marketable securities contractual maturities.

+ References

No definition available.

+ Details

Name:	bbio_ShortTermMarketableSecuritiesContractualMaturities
Namespace Prefix:	bbio_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer.

+ References

No definition available.

+ Details

Name:	us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

This item represents the difference between the gross realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities.

+ References

No definition available.

+ Details

Name:	us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

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