XML 37 R35.htm IDEA: XBRL DOCUMENT
v3.3.0.814

Common Stock Reserved for Future Issuance (Details) - shares | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Stockholders' equity |  |
Shares reserved for future issuance (in shares) | 2,814,716 | 9,445,451
Series A Convertible Preferred Stock |  |
Stockholders' equity |  |
Shares reserved for future issuance (in shares) |  | 5,356,996
Series B Convertible Preferred Stock |  |
Stockholders' equity |  |
Shares reserved for future issuance (in shares) |  | 2,655,992
Warrants for the purchase of Preferred Stock |  |
Stockholders' equity |  |
Shares reserved for future issuance (in shares) |  | 12,283
Warrants for the purchase of Common Stock |  |
Stockholders' equity |  |
Shares reserved for future issuance (in shares) | 59,405 | 34,839
Options to purchase Common Stock |  |
Stockholders' equity |  |
Shares reserved for future issuance (in shares) | 2,572,959 | 1,385,341
Employee Stock Purchase Plan |  |
Stockholders' equity |  |
Shares reserved for future issuance (in shares) | 182,352 |

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

X
- Definition Aggregate number of common shares reserved for future issuance. + 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 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=catb_SeriesConvertibleApreferredStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=catb_SeriesConvertibleBpreferredStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=catb_PreferredStockWarrantsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=catb_CommonStockWarrantsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=us-gaap_EmployeeStockOptionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=catb_EmployeeStockPurchasePlan2015Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |