cm:Concept: us-gaap:InvestmentOwnedOtherThanSecuritiesInvestmentNotReadilyMarketableFlag
| Investment Owned, Other than Security, Investment Not Readily Marketable [true false] |
| us-gaap:InvestmentOwnedOtherThanSecuritiesInvestmentNotReadilyMarketableFlag |
| Used for investments other than securities. Indicates that the investment is not readily marketable. The term "investment not readily marketable" includes investments for which there is no independent publicly quoted market and investments which cannot be sold because of restrictions or conditions applicable to the investment or the company. |
| cm:Concept |
| Yes/No (xbrli:booleanItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:InvestmentOwnedOtherThanSecuritiesInvestmentNotReadilyMarketableFlag |