cm:Concept: us-gaap:ShareBasedGoodsAndNonemployeeServicesTransactionSharesApprovedForIssuance
| Share-based Goods and Nonemployee Services Transaction, Shares Approved for Issuance |
| us-gaap:ShareBasedGoodsAndNonemployeeServicesTransactionSharesApprovedForIssuance |
| The maximum number of shares (or other type of equity) that have been approved for issuance in the equity-based payment transaction. |
| cm:Concept |
| Shares (xbrli:sharesItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:ShareBasedGoodsAndNonemployeeServicesTransactionSharesApprovedForIssuance |