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Condensed Consolidated Statements Of Operations (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Condensed Consolidated Statements Of Operations [Abstract]    
Revenue $ 32,258 $ 36,065
Cost of goods sold 10,380 13,438
Gross profit 21,878 22,627
Operating costs:    
Sales and marketing 9,407 9,024
Research and development 4,702 3,821
General and administrative 5,075 5,101
Amortization of purchased intangible assets 479 493
Total operating costs 19,663 18,439
Operating income 2,215 4,188
Interest income, net 77 109
Other income (expense), net 232 292
Income from continuing operations before income taxes 2,524 4,589
Provision for income taxes 530 942
Net income from continuing operations 1,994 3,647
Income (loss) from discontinued operations (84) (1,147)
Net income $ 1,910 $ 2,500
Basic income (loss) per share    
Continuing $ 0.05 $ 0.10
Discontinued $ 0.00 $ (0.03)
Total $ 0.05 $ 0.07
Diluted income (loss) per share    
Continuing $ 0.05 $ 0.09
Discontinued $ 0.00 $ (0.03)
Total $ 0.05 $ 0.06
Weighted average common shares outstanding:    
Basic 37,690 37,518
Diluted 38,352 38,468