cm:Concept: us-gaap:ShareBasedGoodsAndNonemployeeServicesTransactionQuantityOfSecuritiesIssued
| Share-based Goods and Nonemployee Services Transaction, Quantity of Securities Issued |
| us-gaap:ShareBasedGoodsAndNonemployeeServicesTransactionQuantityOfSecuritiesIssued |
| The number of shares or units of entity securities issued in the transaction in which equity securities were issued to pay for goods or nonemployee services. |
| cm:Concept |
| Shares (xbrli:sharesItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:ShareBasedGoodsAndNonemployeeServicesTransactionQuantityOfSecuritiesIssued |