XML 50 R39.htm IDEA: XBRL DOCUMENT
v3.21.1

Stockholders'/Members' Equity (Deficit) - Schedule of Common Stock Warrants (Details) | 3 Months Ended
--- | ---
Mar. 31, 2021 $ / shares shares
Class Of Stock [Line Items] |
Outstanding and Exercisable | 717,674
December 17, 2021 [Member] |
Class Of Stock [Line Items] |
Outstanding and Exercisable | 566,586
Exercisable, Weighted-Average Exercise Price per Share | $ / shares | $ 88.25
Expiration Date | Dec. 17, 2021
March 12, 2022 [Member] |
Class Of Stock [Line Items] |
Outstanding and Exercisable | 151,088
Exercisable, Weighted-Average Exercise Price per Share | $ / shares | $ 132.37
Expiration Date | Mar. 12, 2022

X
- Definition Common stock warrants expiration date. + References No definition available. + Details
Name: | bcab_CommonStockWarrantsExpirationDate
Namespace Prefix: | bcab_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition Outstanding and exercisable common stock warrants. + References No definition available. + Details
Name: | bcab_OutstandingAndExercisableCommonStockWarrants
Namespace Prefix: | bcab_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_AcceleratedShareRepurchasesDateAxis=bcab_DecemberSeventyTwoThousandTwentyOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AcceleratedShareRepurchasesDateAxis=bcab_MarchTwelveTwoThousandTwentyTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |