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v3.26.1

Leases (Details) $ in Millions | Jun. 03, 2025 USD ($) ft² | Jun. 02, 2025 USD ($) ft² | Mar. 31, 2026 ft² | Oct. 31, 2024 USD ($) ft² | Aug. 16, 2023 ft²
--- | --- | --- | --- | --- | ---
Leases [Abstract] |  |  |  |  |
Lease, term of contract |  |  |  |  | 2 years 6 months
Area of land (in square feet) | ft² | 9,361 | 9,682 | 9,361 | 4,744 | 4,617
Security deposit |  |  |  | $ 0.1 |
Lease, base rent | $ 0.6 | $ 0.5 |  |  |

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- Definition Lessee, Operating Lease, Area + References No definition available. + Details
Name: | bcax_LesseeOperatingLeaseArea
Namespace Prefix: | bcax_
Data Type: | dtr-types:areaItemType
Balance Type: | na
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_LeasesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-3 + Details
Name: | us-gaap_LesseeOperatingLeaseTermOfContract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

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- Definition Amount of operating lease expense. Excludes sublease income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 4 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479041/842-20-45-4 + Details
Name: | us-gaap_OperatingLeaseExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition This element represents money paid in advance to protect the provider of a product or service, such as a lessor, against damage or nonpayment by the buyer or tenant (lessee) during the term of the agreement. Such damages may include physical damage to the property, theft of property, and other contractual breaches. Security deposits held may be interest or noninterest bearing. + References No definition available. + Details
Name: | us-gaap_SecurityDepositLiability
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant