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CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)
In Thousands, except Per Share data
 3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Revenue:        
Product sales $ 3,997 $ 3,911 $ 9,075 $ 8,562
Services 1,375 346 2,204 555
Royalties 541 714 993 1,470
Total revenue 5,913 4,971 12,272 10,587
Costs and expenses:        
Cost of product sales 1,087 840 2,308 1,877
Cost of services 450 74 807 145
Research and development 1,810 2,082 3,770 4,117
Selling and marketing 1,060 1,053 2,111 2,119
General and administrative 1,789 1,416 2,986 2,818
Total costs and expenses 6,196 5,465 11,982 11,076
Income (loss) from operations (283) (494) 290 (489)
Other income   325   325
Interest income 16 21 35 39
Income (loss) before provision for income taxes (267) (148) 325 (125)
Provision for income taxes     2 1
Net income (loss) $ (267) $ (148) $ 323 $ (126)
Net income (loss) per share - basic (in doller per share) $ (0.01) $ (0.01) $ 0.02 $ (0.01)
Net income (loss) per share - diluted (in doller per share) $ (0.01) $ (0.01) $ 0.02 $ (0.01)
Weighted average shares - basic (in shares) 20,700 19,927 20,461 19,920
Weighted average shares - diluted (in shares) 20,700 19,927 20,821 19,920