cm:Concept: us-gaap:ConcentrationRiskProduct
| Concentration Risk, Product |
| us-gaap:ConcentrationRiskProduct |
| Description of risks that arise due to the volume of revenue generated by a particular product or other reliance placed on the success of that product, and the characteristics of that product that may give rise to the risk (for example, a patent or trademark expiration date). At a minimum, the description informs financial statement users of the general nature of the risk. |
| cm:Concept |
| Text/String (xbrli:stringItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:ConcentrationRiskProduct |