Commitments and Contingencies (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012
2012	$ 158
2013	154
2014	141
2015	$ 148

Amount of required minimum rental payments due in the current fiscal year.

No definition available.

Name:	crbn_OperatingLeasesFutureMinimumPaymentsDueInCurrentFiscalYear
Namespace Prefix:	crbn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant