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Business Segments - Summary of revenue by product group (Details 1) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Segment Reporting Information [Line Items]        
Revenue $ 5,905 $ 5,899 $ 12,997 $ 17,637
Operating Segments | Biometrics        
Segment Reporting Information [Line Items]        
Revenue 3,327 4,514 9,818 13,241
Operating Segments | Imaging        
Segment Reporting Information [Line Items]        
Revenue 2,537 1,336 3,061 4,144
Operating Segments | DSL royalties        
Segment Reporting Information [Line Items]        
Revenue $ 41 $ 49 $ 118 $ 252