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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, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Segment Reporting Information [Line Items]        
Revenue $ 6,904 $ 4,510 $ 11,738 $ 8,633
Operating Segments | Biometrics        
Segment Reporting Information [Line Items]        
Revenue 5,443 3,883 8,727 7,731
Operating Segments | Imaging        
Segment Reporting Information [Line Items]        
Revenue 1,332 522 2,808 696
Operating Segments | DSL royalties        
Segment Reporting Information [Line Items]        
Revenue $ 129 $ 105 $ 203 $ 206