cm:Concept: us-gaap:InventoryForLongTermContractsOrProgramsGeneralAndAdministrativeCostsIncludedInInventory
       
          
          | Inventory for Long-term Contracts or Programs, General and Administrative Costs Included in Inventory | 
       
       
          
          | us-gaap:InventoryForLongTermContractsOrProgramsGeneralAndAdministrativeCostsIncludedInInventory | 
       
       
          
          | The actual or estimated amount of general and administrative expense remaining in inventory as of the balance sheet date. | 
       
       
          
          | cm:Concept | 
       
       
          
          | Monetary (xbrli:monetaryItemType) | 
       
       
          
          | As Of (instant) | 
       
       
          
          | Debit | 
       
       
          
          | false | 
       
       
          
          | us-gaap:InventoryForLongTermContractsOrProgramsGeneralAndAdministrativeCostsIncludedInInventory |