cm:Concept: us-gaap:IncreaseDecreaseInAccountsPayableAndAccruedLiabilities
       
          
          | Increase (Decrease) in Accounts Payable and Accrued Liabilities | 
       
       
          
          | us-gaap:IncreaseDecreaseInAccountsPayableAndAccruedLiabilities | 
       
       
          
          | The increase (decrease) during the reporting period in the amounts payable to vendors for goods and services received and the amount of obligations and expenses incurred but not paid. | 
       
       
          
          | cm:Concept | 
       
       
          
          | Monetary (xbrli:monetaryItemType) | 
       
       
          
          | For Period (duration) | 
       
       
          
          | Debit | 
       
       
          
          | false | 
       
       
          
          | us-gaap:IncreaseDecreaseInAccountsPayableAndAccruedLiabilities |