Commitments and Contingencies (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012
2012	$ 83
2013	202
2014	190
2015	$ 197

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