cm:Concept: us-gaap:DebtConversionConvertedInstrumentExpirationOrDueDateMonthAndYear
| Debt Conversion, Converted Instrument, Expiration or Due Date, Month and Year |
| us-gaap:DebtConversionConvertedInstrumentExpirationOrDueDateMonthAndYear |
| The expiration, mandatory redemption, or due date, month and year (YYYY-MM), of the financial instrument issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. |
| cm:Concept |
| Year/Month (xbrli:gYearMonthItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:DebtConversionConvertedInstrumentExpirationOrDueDateMonthAndYear |