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Revenue Recognition (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 31, 2017 | Aug. 31, 2017 | Dec. 31, 2017 | Sep. 30, 2017 | Dec. 31, 2017
Revenue recognition |  |  |  |  |
Revenue recognized related to a Option agreement |  |  | $ 250 | $ 250 | $ 500
Option agreement |  |  |  |  |
Revenue recognition |  |  |  |  |
Non-refundable up-front payment |  | $ 250 |  |  |
Quarterly payments |  | $ 250 |  |  |
Quarterly payment received | $ 250 |  |  |  |
Revenue recognized related to a Option agreement |  |  |  |  | $ 500

X
- Definition Represents the amount of quarterly payments that will be made by Recipient, as its option, at the beginning of each of the next two quarterly periods. + References No definition available. + Details
Name: | catb_OptionAgreementQuarterlyPayment
Namespace Prefix: | catb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount received for extending the agreement term. + References No definition available. + Details
Name: | catb_PaymentsReceivedForExtendingAgreementTerm
Namespace Prefix: | catb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount received as non-refundable up-front payment. + References No definition available. + Details
Name: | catb_ProceedsFromNonRefundableUpFrontPayment
Namespace Prefix: | catb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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_RevenueRecognitionMultipleDeliverableArrangementsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
Name: | us-gaap_Revenues
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_TypeOfArrangementAxis=catb_OptionAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |