cm:Concept: us-gaap:ConcentrationRiskCustomer
| Concentration Risk, Customer |
| us-gaap:ConcentrationRiskCustomer |
| Description of risks that arise due to the volume of business transacted with a particular customer. At a minimum, the description informs financial statement users of the general nature of the risk, but excludes "Information about Major Customers" that may be disclosed elsewhere (for instance, segment disclosures). |
| cm:Concept |
| Text/String (xbrli:stringItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:ConcentrationRiskCustomer |