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Segment Reporting and Geographic Information (Tables)
9 Months Ended
Sep. 30, 2012
Segment Reporting and Geographic Information [Abstract]  
Revenues by geographic region
                                 
    Nine months ended
September 30,
    Three months ended
September 30,
 
    2011     2012     2011     2012  

United States

    94     94     95     93

Canada

    5     6     5     7

Other countries

    *       *       *       *  
   

 

 

   

 

 

   

 

 

   

 

 

 
      100     100     100     100