cm:Concept: us-gaap:DebtConversionConvertedInstrumentIssuanceDateDayMonthAndYear
       
          
          | Debt Conversion, Converted Instrument, Issuance Date | 
       
       
          
          | us-gaap:DebtConversionConvertedInstrumentIssuanceDateDayMonthAndYear | 
       
       
          
          | Date the financial instrument was issued in exchange for the original debt being converted in a noncash or part noncash transaction, in CCYY-MM-DD format. | 
       
       
          
          | cm:Concept | 
       
       
          
          | Date (xbrli:dateItemType) | 
       
       
          
          | For Period (duration) | 
       
       
          
          | (no balance type) | 
       
       
          
          | false | 
       
       
          
          | us-gaap:DebtConversionConvertedInstrumentIssuanceDateDayMonthAndYear |