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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, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Segment Reporting Information [Line Items]        
Total revenue $ 5,401 $ 5,707 $ 12,073 $ 12,405
Operating Segments | Biometrics        
Segment Reporting Information [Line Items]        
Total revenue 5,216 3,127 11,104 9,218
Operating Segments | Imaging        
Segment Reporting Information [Line Items]        
Total revenue 185 2,537 969 3,060
Operating Segments | DSL royalties        
Segment Reporting Information [Line Items]        
Total revenue $ 0 $ 43 $ 0 $ 127