cm:Concept: us-gaap:WarrantsAndRightsOutstandingFairValueByFairValueHierarchyLevelExtensibleList
| Warrants and Rights Outstanding, Fair Value by Fair Value Hierarchy Level [Extensible List] |
| us-gaap:WarrantsAndRightsOutstandingFairValueByFairValueHierarchyLevelExtensibleList |
| Indicates level within fair value hierarchy of outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur. |
| cm:Concept |
| srt-types:extensibleListItemType |
| As Of (instant) |
| (no balance type) |
| false |
| us-gaap:WarrantsAndRightsOutstandingFairValueByFairValueHierarchyLevelExtensibleList |