cm:Concept: us-gaap:ResearchAndDevelopmentAssetAcquiredOtherThanThroughBusinessCombinationWrittenOff
| Research and Development Asset Acquired Other than Through Business Combination, Written-off |
| us-gaap:ResearchAndDevelopmentAssetAcquiredOtherThanThroughBusinessCombinationWrittenOff |
| The amount of the write-off for research and development assets that were acquired in a transaction other than a business combination. |
| cm:Concept |
| Monetary (xbrli:monetaryItemType) |
| For Period (duration) |
| Debit |
| false |
| us-gaap:ResearchAndDevelopmentAssetAcquiredOtherThanThroughBusinessCombinationWrittenOff |