cm:Concept: us-gaap:OwnshareLendingArrangementSharesOutstandingValue
| Own-share Lending Arrangement, Shares, Outstanding, Value |
| us-gaap:OwnshareLendingArrangementSharesOutstandingValue |
| The fair value as of the date of the statement of financial position of shares outstanding in connection with an own-share lending arrangement, in contemplation of a convertible debt offering or other financing. |
| cm:Concept |
| Monetary (xbrli:monetaryItemType) |
| As Of (instant) |
| Credit |
| false |
| us-gaap:OwnshareLendingArrangementSharesOutstandingValue |