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Commitments and Contingencies - Additional Information (Details) - Operating Lease Agreement - USD ($) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Commitments and Contingencies [Line Items] |  |
Operating lease, description | The lease term commenced in May 2019 and will expire in July 2022. |
Lease commencement period | 2019-05 |
Lease expiration period | 2022-07 |
Initial annual base rent | $ 261,000 |
Percentage of annual increase of base rent | 2.00% |
Rent expense | $ 266,000 | $ 178,000

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- Definition Annual increase percentage of base rent. + References No definition available. + Details
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Namespace Prefix: | caba_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Commitments and contingencies disclosure. + References No definition available. + Details
Name: | caba_CommitmentsAndContingenciesDisclosureLineItems
Namespace Prefix: | caba_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Lease commencement month and year. + References No definition available. + Details
Name: | caba_LeaseCommencementMonthAndYear
Namespace Prefix: | caba_
Data Type: | xbrli:gYearMonthItemType
Balance Type: | na
Period Type: | duration

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- Definition Lease expiration month and year. + References No definition available. + Details
Name: | caba_LeaseExpirationMonthAndYear
Namespace Prefix: | caba_
Data Type: | xbrli:gYearMonthItemType
Balance Type: | na
Period Type: | duration

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- Definition Rent expense. + References No definition available. + Details
Name: | caba_RentExpense
Namespace Prefix: | caba_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Description of lessee's operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918673-209980 + Details
Name: | us-gaap_LesseeOperatingLeaseDescription
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition This element represents the payments that the lessee is obligated to make or can be required to make in connection with a property under the terms of an agreement classified as an operating lease, excluding contingent rentals and a guarantee by the lessee of the lessor's debt and the lessee's obligation to pay (apart from the rental payments) executory costs such as insurance, maintenance, and taxes. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 25 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121595440&loc=d3e34039-112682 Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=121580752&loc=d3e38371-112697 Reference 3: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121573735&loc=d3e41499-112717 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |