cm:Axis: us-gaap:ResearchAndDevelopmentAssetsAcquiredOtherThanThroughBusinessCombinationByTransactionAxis
| Research and Development Assets Acquired Other than Through Business Combination by Transaction [Axis] |
| us-gaap:ResearchAndDevelopmentAssetsAcquiredOtherThanThroughBusinessCombinationByTransactionAxis |
| Required disclosures pertaining to capitalized costs of research and development arrangements acquired in other than a business combination, by arrangement. |
| cm:Axis |
| Text/String (xbrli:stringItemType) |
| For Period (duration) |
| (no balance type) |
| true |
| us-gaap:ResearchAndDevelopmentAssetsAcquiredOtherThanThroughBusinessCombinationByTransactionAxis |