| **Subsequent Events (Details) (Subsequent Event [Member], USD $)** | Apr. 30, 2014 |
|--------------------------------------------------------------------|---------------|
| Common Stock [Member]                                              |          |
| **Subsequent Event [Line Items]**                                  |          |
| Maximum shares up for sale                                         | $ 20,000,000  |
| Maximum shares up for resale, shares                               | 1,107,626     |
| Shares issuable upon exercise of a warrant                         | 22,072        |
| Forecast [Member] | Restricted Stock [Member]                      |          |
| **Subsequent Event [Line Items]**                                  |          |
| Restricted stock expected to become non-transferable               | 267,937       |

| X                                                                                                                                                                                                                                                                                         |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Registration Statement, Maximum Number of Shares for Sale
+ References
No definition available.
+ Details**Name:**cob_RegistrationStatementMaximumNumberofSharesforSale**Namespace Prefix:**cob_**Data Type:**xbrli:sharesItemType**Balance Type:**na**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                         |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Registration Statement, Maximum Shares for Sale, Value
+ References
No definition available.
+ Details**Name:**cob_RegistrationStatementMaximumSharesforSaleValue**Namespace Prefix:**cob_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                  |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Granted, Non-Transferable
+ References
No definition available.
+ Details**Name:**cob_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsGrantedNonTransferable**Namespace Prefix:**cob_**Data Type:**xbrli:sharesItemType**Balance Type:**na**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph i -Subparagraph 2 -Article 4
+ Details**Name:**us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights**Namespace Prefix:**us-gaap_**Data Type:**xbrli:sharesItemType**Balance Type:**na**Period Type:**instant |
| X                                                                                                                                                            |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_SubsequentEventLineItems**Namespace Prefix:**us-gaap_**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |