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Note 7. Geographical Information (Tables)
9 Months Ended
Sep. 30, 2017
Segment Reporting [Abstract]  
Revenue based on geographic region
   Three months ended  Nine months ended
   September 30,  September 30,
   2017  2016  2017  2016
Geographic region                    
North America  $2,640   $2,509   $8,305   $8,057 
Europe   291    364    924    1,227 
Total revenues  $2,931   $2,873   $9,229   $9,284