cm:Concept: us-gaap:NewAccountingPronouncementTransitionGuidanceNotSignificantOrNotPractical
       
          
          | New Accounting Pronouncement, Transition Guidance Not Significant or Not Practical | 
       
       
          
          | us-gaap:NewAccountingPronouncementTransitionGuidanceNotSignificantOrNotPractical | 
       
       
          
          | A description of the fact that the effect (or portion of the effect) of initially applying the pending content  is not significant or not practicable to estimate. | 
       
       
          
          | cm:Concept | 
       
       
          
          | Text/String (xbrli:stringItemType) | 
       
       
          
          | For Period (duration) | 
       
       
          
          | (no balance type) | 
       
       
          
          | false | 
       
       
          
          | us-gaap:NewAccountingPronouncementTransitionGuidanceNotSignificantOrNotPractical |