cm:Concept: us-gaap:DeferredFinanceCostsOwnshareLendingArrangementIssuanceCostsGross
| Deferred Finance Costs, Own-share Lending Arrangement, Issuance Costs, Gross |
| us-gaap:DeferredFinanceCostsOwnshareLendingArrangementIssuanceCostsGross |
| Amount of issuance costs recognized in a share-lending arrangement entered into by the entity, in contemplation of a convertible debt offering or other financing, before deduction of accumulated amortization or effects of subsequent adjustments. |
| cm:Concept |
| Monetary (xbrli:monetaryItemType) |
| As Of (instant) |
| Debit |
| false |
| us-gaap:DeferredFinanceCostsOwnshareLendingArrangementIssuanceCostsGross |