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Business Segments - Summary of revenue by product group (Details 1) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Segment Reporting Information [Line Items]        
Revenue $ 4,510 $ 6,767 $ 8,633 $ 13,384
Operating Segments | Biometrics        
Segment Reporting Information [Line Items]        
Revenue 3,883 6,029 7,731 12,210
Operating Segments | Imaging        
Segment Reporting Information [Line Items]        
Revenue 522 574 696 697
Operating Segments | DSL royalties        
Segment Reporting Information [Line Items]        
Revenue $ 105 $ 164 $ 206 $ 477