cm:Concept: us-gaap:ShareBasedGoodsAndNonemployeeServicesTransactionDescriptionOfGoodsOrServicesReceived
| Share-based Goods and Nonemployee Services Transaction, Description of Goods or Services Received |
| us-gaap:ShareBasedGoodsAndNonemployeeServicesTransactionDescriptionOfGoodsOrServicesReceived |
| Description of the goods (for example, inventory, equipment, land) or services (for example, consulting, office space rental) received or to be received from the counterparty to the transaction. |
| cm:Concept |
| Text/String (xbrli:stringItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:ShareBasedGoodsAndNonemployeeServicesTransactionDescriptionOfGoodsOrServicesReceived |