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Redeemable Convertible Preferred Stock - Dividends (Details)	Sep. 30, 2024
Series B Redeemable Convertible Preferred Stock
Temporary Equity [Line Items]
Dividend rate	8.00%
Series C Redeemable Convertible Preferred Stock
Temporary Equity [Line Items]
Dividend rate	8.00%

X

- Definition

Temporary Equity, Dividend Rate, Percentage

+ References

No definition available.

+ Details

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Namespace Prefix:	bcax_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type: