The element represents amended license agreement payment received.

No definition available.

Name:	bcab_AmendedLicenseAgreementPaymentReceived
Namespace Prefix:	bcab_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The element represents commitment fee amount.

+ References

No definition available.

+ Details

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

- Definition

The element represents reduction in workforce.

+ References

No definition available.

+ Details

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Namespace Prefix:	bcab_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The element represents sale of stock maximum commitment amount.

+ References

No definition available.

+ Details

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

- Definition

Face amount or stated value per share of common stock.

+ References

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Period Type:	instant

- Definition

Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

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Balance Type:	na
Period Type:	instant

- Definition

The portion of the carrying value of long-term convertible debt as of the balance sheet date that is scheduled to be repaid within one year or in the normal operating cycle if longer. Convertible debt is a financial instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-Paragraph 1
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+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The cash inflow from the additional capital contribution to the entity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Section 45
-Paragraph 14
-Subparagraph (a)
-SubTopic 10
-Topic 230
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-URI https://asc.fasb.org/1943274/2147482740/230-10-45-14

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Describes the event or transaction that occurred between the balance sheet date and the date the financial statements are issued or available to be issued.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Section 50
-Paragraph 2
-Subparagraph (a)
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-URI https://asc.fasb.org/1943274/2147483399/855-10-50-2

+ Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-SubTopic 30
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Data Type:	xbrli:stringItemType
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Period Type:	duration

- Details

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Namespace Prefix:
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- Details

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Balance Type:
Period Type:

- Details

Name:	srt_CounterpartyNameAxis=bcab_YorkvilleMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Balance Type:
Period Type:

- Details

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Namespace Prefix:
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Period Type:

Subsequent Events (Details Narrative) - USD ($)		3 Months Ended		6 Months Ended	12 Months Ended
Subsequent Events (Details Narrative) - USD ($)	Oct. 15, 2026	Jun. 30, 2026	Mar. 31, 2026	Jun. 30, 2026	Dec. 31, 2025	Aug. 26, 2026	Aug. 01, 2026	Dec. 30, 2025	Dec. 31, 2024
Subsequent Event [Line Items]
Common Stock, Par or Stated Value Per Share		$ 0.0001		$ 0.0001	$ 0.0001				$ 0.0001
Common Stock, Shares, Issued		1,663,280		1,663,280	1,269,286				1,161,983
Reduction In Workforce				70.00%	30.00%
Standby Equity Purchase Agreement [Member]
Subsequent Event [Line Items]
Common Stock, Shares, Issued					4,868			4,868
Proceeds from Issuance of Common Stock		$ 0.0		$ 400,000
Subsequent Event [Member]
Subsequent Event [Line Items]
Outstanding pre paid advance amount convertible into common stock					$ 4,500,000
Common Stock, Shares, Issued			48,092
Proceeds from Issuance of Common Stock			$ 400,000
Reduction In Workforce					70.00%
Subsequent Event [Member] \| Yorkville [Member]
Subsequent Event [Line Items]
Commitment Fee Amount	$ 500,000
Subsequent Event [Member] \| Common Stock [Member]
Subsequent Event [Line Items]
Common Stock, Par or Stated Value Per Share						$ 0.0001
Subsequent Event [Member] \| Common Stock [Member] \| Standby Equity Purchase Agreement [Member] \| Yorkville [Member]
Subsequent Event [Line Items]
Common Stock, Par or Stated Value Per Share	$ 0.0001
Sale Of Stock Maximum Commitment Amount	$ 40,000.0
Subsequent Event, Description	On October 15, 2026, in connection with entering into the 2026 SEPA described above, the Company terminated the SEPA dated as of November 20, 2025 (the “Prior SEPA”), between the Company and Yorkville. Pursuant to the Prior SEPA, the Company had the right, but not the obligation, to sell to Yorkville up to $15.0 million of shares of Common Stock. Prior to its termination, the Company sold an aggregate of 48,092 shares of Common Stock to Yorkville under the Prior SEPA for aggregate gross proceeds of approximately $0.4 million.
Context Therapeutics Inc [Member] \| Subsequent Event [Member]
Subsequent Event [Line Items]
Amended License Agreement Payment Received							$ 2,000,000.0