cm:Member: us-gaap:PreferredNonConvertibleStockMember
| Preferred Non-Convertible Stock [Member] |
| us-gaap:PreferredNonConvertibleStockMember |
| Preferred shares which, at issuance, may not be exchanged into common shares or other types of securities. Preferred shares may provide a preferential dividend to the dividend on common stock and may take precedence over common stock in the event of liquidation. Preferred shares (which are neither mandatorily redeemable nor redeemable at the option of the holder) typically represent an ownership interest in the entity. |
| cm:Member |
| [Member] (nonnum:domainItemType) |
| For Period (duration) |
| (no balance type) |
| true |
| us-gaap:PreferredNonConvertibleStockMember |