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Fair Value Measurements - Narrative (Details) $ in Thousands	Sep. 30, 2023 USD ($)
Fair Value Disclosures [Abstract]
Tranche rights liability	$ 6,000

X

- Definition

Freestanding Financial Instrument, Liability, Current

+ References

No definition available.

+ Details

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

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- References

No definition available.

+ Details

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