cm:Member: us-gaap:OptionIndexedToIssuersEquityTypeDomain
| Option Indexed to Issuer's Equity, Type [Domain] |
| us-gaap:OptionIndexedToIssuersEquityTypeDomain |
| Description of the type of freestanding contract issued by a Company that is indexed to, and potentially settled in, a Company's own stock. Specifically, the pertinent rights and privileges of the securities outstanding. |
| cm:Member |
| [Member] (nonnum:domainItemType) |
| For Period (duration) |
| (no balance type) |
| true |
| us-gaap:OptionIndexedToIssuersEquityTypeDomain |