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CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Revenue:      
Product sales $ 18,129 $ 18,914 $ 15,376
Services 4,311 1,992 4,611
Royalties 2,146 2,654 2,055
Total revenue 24,586 23,560 22,042
Costs and expenses:      
Cost of product sales 3,637 4,362 2,887
Cost of services 1,777 714 2,896
Research and development 7,240 8,096 11,920
Selling and marketing 4,441 4,283 4,707
General and administrative 5,005 6,438 5,114
Total costs and expenses 22,100 23,893 27,524
Income (loss) from operations 2,486 (333) (5,482)
Gain on sale of assets     6,230
Other income   425  
Interest income 83 90 238
Income before provision for income taxes 2,569 182 986
Provision for income taxes 2 2 4
Net income $ 2,567 $ 180 $ 982
Net income per share - basic (in dollars per share) $ 0.12 $ 0.01 $ 0.05
Net income per share - diluted (in dollars per share) $ 0.12 $ 0.01 $ 0.05
Weighted average shares - basic (in shares) 20,534 19,971 20,869
Weighted average shares - diluted (in shares) 20,735 20,182 20,874