cm:Level3TextBlock: us-gaap:DeferredRevenueByArrangementDisclosureTextBlock
| Deferred Revenue, by Arrangement, Disclosure [Table Text Block] |
| us-gaap:DeferredRevenueByArrangementDisclosureTextBlock |
| Tabular disclosure of the type of arrangements and the corresponding amounts that comprise the current and noncurrent balance of deferred revenue as of the balance sheet date. |
| cm:Level3TextBlock |
| Text Block (HTML) (nonnum:textBlockItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:DeferredRevenueByArrangementDisclosureTextBlock |
| DeferredRevenueArrangementByType |