cm:Concept: us-gaap:WarrantsAndRightsOutstandingChangeInValuationTechnique
| Warrants and Rights Outstanding, Change in Valuation Technique [true false] |
| us-gaap:WarrantsAndRightsOutstandingChangeInValuationTechnique |
| Indicates (true false) whether valuation technique or approach changed for measuring 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 |
| Yes/No (xbrli:booleanItemType) |
| As Of (instant) |
| (no balance type) |
| false |
| us-gaap:WarrantsAndRightsOutstandingChangeInValuationTechnique |