cm:Concept: us-gaap:DebtConversionConvertedInstrumentAmount1
| Debt Conversion, Converted Instrument, Amount |
| us-gaap:DebtConversionConvertedInstrumentAmount1 |
| The value of the financial instrument(s) that the original debt is being converted into 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 |
| Monetary (xbrli:monetaryItemType) |
| For Period (duration) |
| Credit |
| false |
| us-gaap:DebtConversionConvertedInstrumentAmount1 |