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Business Segment - Results of operations for reportable segments (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Segment Reporting Information [Line Items]        
Revenue $ 4,470 $ 5,256 $ 14,936 $ 14,240
Operating income (loss) before patent related income (2,161) 1,446 134 2,613
Gain on sale of patent assets   15,167   86,394
Income from patent arrangement     780  
Other income 27   27 85
Interest income 80 45 239 137
Income (loss) from continuing operations before taxes (2,054) 16,658 1,180 89,229
Provision for (benefit from) income taxes (901) 6,578 169 23,248
Income (loss) from continuing operations (1,153) 10,080 1,011 65,981
Income from discontinued operations, net of tax    217    360
Net income (loss) (1,153) 10,297 1,011 66,341
Reportable Segment | Biometrics & Imaging
        
Segment Reporting Information [Line Items]        
Revenue 4,144 4,287 12,982 10,847
Operating income (loss) before patent related income 1,515 2,111 4,848 4,725
Reportable Segment | DSL Service Assurance
        
Segment Reporting Information [Line Items]        
Revenue 156 485 1,217 1,794
Operating income (loss) before patent related income (3,457) (446) (4,266) (1,062)
Corporate
        
Segment Reporting Information [Line Items]        
Revenue 170 484 737 1,599
Operating income (loss) before patent related income (219) (219) (448) (1,050)
Gain on sale of patent assets   15,167   86,394
Income from patent arrangement     780  
Other income 27   27 85
Interest income 80 45 239 137
Provision for (benefit from) income taxes $ (901) $ 6,578 $ 169 $ 23,248