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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

X

- 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: