cm:Concept: us-gaap:ReorganizationUnderChapter11BankruptcyIssuanceOfCommonStock
| Reorganization under Chapter 11 Bankruptcy, Issuance of Common Stock [true false] |
| us-gaap:ReorganizationUnderChapter11BankruptcyIssuanceOfCommonStock |
| Indicates (true false) whether reorganization plan under Chapter 11 bankruptcy requires issuance of common stock or common stock equivalent. |
| cm:Concept |
| Yes/No (xbrli:booleanItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:ReorganizationUnderChapter11BankruptcyIssuanceOfCommonStock |