cm:Concept: us-gaap:ShareBasedGoodsAndNonemployeeServicesTransactionStockholdersEquity
| Share-based Goods and Nonemployee Services Transaction, Stockholders' Equity |
| us-gaap:ShareBasedGoodsAndNonemployeeServicesTransactionStockholdersEquity |
| The amount by which stockholders' equity was increased by the transaction in which equity securities were issued to pay for goods or nonemployee services. |
| cm:Concept |
| Monetary (xbrli:monetaryItemType) |
| For Period (duration) |
| Credit |
| false |
| us-gaap:ShareBasedGoodsAndNonemployeeServicesTransactionStockholdersEquity |