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Summary of Significant Accounting Polices - Grant Awards (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Summary of Significant Accounting Policies
Grants from Muscular Dystrophy Association	$ 124,000	$ 376,000	$ 100,000
Grants utilized to offset related expenses	$ 205,000	$ 224,000	$ 100,000

X

- Definition

Grants recorded as reduction in research and development expenses

+ References

No definition available.

+ Details

Name:	catb_GrantOffsettingResearchAndDevelopmentExpenses
Namespace Prefix:	catb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

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

X

- Definition

Revenue earned during the period from non-repayable sum of money awarded to an entity to carry out a specific purpose as provided in grant agreements.

+ 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(e))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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