cm:Concept: us-gaap:EntityWideDisclosureOnGeographicAreasDescriptionOfRevenueFromExternalCustomers
| Disclosure on Geographic Areas, Description of Revenue from External Customers |
| us-gaap:EntityWideDisclosureOnGeographicAreasDescriptionOfRevenueFromExternalCustomers |
| Disclosure about revenues from external customers (1) attributed to the entity's country of domicile and (2) attributed to all foreign countries in total from which the entity derives revenues. |
| cm:Concept |
| Text/String (xbrli:stringItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:EntityWideDisclosureOnGeographicAreasDescriptionOfRevenueFromExternalCustomers |