cm:Concept: us-gaap:ShareBasedGoodsAndNonemployeeServicesTransactionModificationOfTermsDescriptionAndTerms
| Share-based Payment, Product and Nonemployee Service, Modification, Description |
| us-gaap:ShareBasedGoodsAndNonemployeeServicesTransactionModificationOfTermsDescriptionAndTerms |
| Description of modification of arrangement in which share-based payment is issued for product and nonemployee service. Includes, but is not limited to, change in terms and conditions. |
| cm:Concept |
| Text/String (xbrli:stringItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:ShareBasedGoodsAndNonemployeeServicesTransactionModificationOfTermsDescriptionAndTerms |