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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (unaudited) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Revenue:        
Product sales $ 4,027 $ 3,997 $ 8,578 $ 9,075
Services 683 1,375 1,375 2,204
Royalties 624 541 1,115 993
Total revenue 5,334 5,913 11,068 12,272
Costs and expenses:        
Cost of product sales 830 1,087 1,290 2,308
Cost of services 361 450 717 807
Research and development 1,653 1,810 3,406 3,770
Selling and marketing 1,046 1,060 2,184 2,111
General and administrative 1,075 1,789 2,060 2,986
Total costs and expenses 4,965 6,196 9,657 11,982
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
Provision for income taxes 16,768   16,770 2
Net income (loss) 54,926 (267) 56,044 323
Other comprehensive income, net of $0 tax:        
Unrealized gains (loss) on available for sale securities (39)   20  
Comprehensive income (loss) $ 54,887 $ (267) $ 56,064 $ 323
Net income (loss) per share - basic (in dollars per share) $ 2.52 $ (0.01) $ 2.64 $ 0.02
Net income (loss) per share - diluted (in dollars per share) $ 2.49 $ (0.01) $ 2.60 $ 0.02
Weighted average shares - basic (in shares) 21,757 20,700 21,241 20,461
Weighted average shares - diluted (in shares) 22,099 20,700 21,583 20,821