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Restricted Cash (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Restricted Cash |  |
Security deposit held for operating lease agreement | $ 0.1 | $ 0.1

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

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- Definition The amount of an asset, typically cash, provided to a counterparty to provide certain assurance of performance by the entity pursuant to the terms of a written or oral agreement, such as a lease. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.8,17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_SecurityDeposit
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant