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Business Segment - Results of operations for reportable segments (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Revenue $ 5,334 $ 5,913 $ 11,068 $ 12,272
Income (loss) from operations 369 (283) 1,411 290
Gain on sale of patent assets 71,226   71,226  
Other income 59   85  
Interest income 40 16 92 35
Income (Loss) before provision for income taxes 71,694 (267) 72,814 325
Provisions for income taxes (16,768)   (16,770) (2)
Net income (Loss) 54,926 (267) 56,044 323
Biometrics & Imaging
        
Revenue 2,890 2,950 6,560 5,855
Income (loss) from operations 897 1,038 2,614 2,065
DSL Service Assurance
        
Revenue 1,820 2,422 3,393 5,425
Income (loss) from operations (262) (420) (570) (468)
Corporate
        
Revenue 624 541 1,115 992
Income (loss) from operations (266) (901) (633) (1,307)
Gain on sale of patent assets 71,226   71,226  
Other income 59   85  
Interest income 40 16 92 35
Provisions for income taxes $ (16,768)   $ (16,770) $ (2)