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Summary of Significant Accounting Polices - Grant Awards (Details) - USD ($)	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Summary of Significant Accounting Policies
Grants from Muscular Dystrophy Association	$ 100,000	$ 0	$ 35,000

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

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- References

No definition available.

+ Details

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