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Business Segments (Tables)
 9 Months Ended
Sep. 30, 2017
Segment Reporting [Abstract]  
Schedule of revenues generated from geographic regions
    Three Months Ended     Nine Months Ended  
    September 30,     September 30,  
    2017     2016     2017     2016  
                         
United States   $ 5,213     $ 4,929     $ 10,326     $ 14,849  
Rest of World     692       970       2,671       2,788  
    $ 5,905     $ 5,899     $ 12,997     $ 17,637  
Schedule of revenue by product group
    Three Months Ended     Nine Months Ended  
    September 30,     September 30,  
    2017     2016     2017     2016  
                         
Biometrics   $ 3,327     $ 4,514     $ 9,818     $ 13,241  
Imaging     2,537       1,336       3,061       4,144  
DSL royalties     41       49       118       252  
    $ 5,905     $ 5,899     $ 12,997     $ 17,637