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Condensed Consolidated Statements of Operations (Unaudited) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Condensed Consolidated Statements of Operations [Abstract]        
Net Revenue $ 46,642 $ 42,103 $ 78,900 $ 78,169
Cost of goods sold 17,191 16,397 27,571 29,835
Gross profit 29,451 25,706 51,329 48,334
Operating costs:        
Sales and marketing 9,856 10,956 19,264 19,980
Research and development 4,796 4,836 9,497 8,658
General and administrative 5,330 5,348 10,405 10,449
Amortization of purchased intangible assets 472 507 951 999
Total operating costs 20,454 21,647 40,117 40,086
Operating income 8,997 4,059 11,212 8,248
Interest income, net 68 131 145 240
Other income, net 300 326 532 617
Income from continuing operations before income taxes 9,365 4,516 11,889 9,105
Provision for income taxes 1,967 1,177 2,497 2,119
Net income from continuing operations 7,398 3,339 9,392 6,986
Income (loss) from discontinued operations (236) (718) (319) (1,865)
Net income $ 7,162 $ 2,621 $ 9,073 $ 5,121
Basic income (loss) per share        
Continuing $ 0.19 $ 0.09 $ 0.25 $ 0.19
Discontinued $ (0.01) $ (0.02) $ (0.01) $ (0.05)
Total $ 0.18 $ 0.07 $ 0.24 $ 0.14
Diluted income (loss) per share        
Continuing $ 0.19 $ 0.09 $ 0.24 $ 0.18
Discontinued $ (0.01) $ (0.02) $ (0.01) $ (0.05)
Total $ 0.18 $ 0.07 $ 0.23 $ 0.13
Weighted average common shares outstanding:        
Basic 38,065 37,532 37,928 37,526
Diluted 38,742 38,752 38,597 38,611