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Divestiture of Automatic License Plate Recognition Business (Tables)
3 Months Ended
Mar. 31, 2016
Discontinued Operations and Disposal Groups [Abstract]  
Schedule of revenue, operating income and net loss from discontinued operations

Revenue, operating income and net loss from discontinued operations were as follows (in thousands):

         
   Three-Month Periods Ended
March 31,
 
   2016   2015 
Net revenue  $   $680 
Operating loss from continuing operations       (899)
Net loss on discontinued operations, net of tax  $   $(899)