| Standard label: | Substantial Doubt about Going Concern [Text Block] |
| Name: | us-gaap:SubstantialDoubtAboutGoingConcernTextBlock |
| Documentation: | The entire disclosure when substantial doubt is raised about the ability to continue as a going concern. Includes, but is not limited to, principal conditions or events that raised substantial doubt about the ability to continue as a going concern, management's evaluation of the significance of those conditions or events in relation to the ability to meet its obligations, and management's plans that alleviated or are intended to mitigate the conditions or events that raise substantial doubt about the ability to continue as a going concern. |
| Object type: | cm:Level1TextBlock |
| Data type: | Text Block (HTML) (nonnum:textBlockItemType) |
| Period type: | For Period (duration) |
| Balance type: | (no balance type) |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:SubstantialDoubtAboutGoingConcernTextBlock |
| Label | Role | Language |
| Substantial Doubt about Going Concern [Text Block] | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 205 40 | http://fasb.org/us-gaap/role/ref/legacyRef | 205 |