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Condensed Consolidated Statements of Operations (Unaudited) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Condensed Consolidated Statements of Operations [Abstract]        
Net Revenue $ 36,292 $ 41,385 $ 115,192 $ 119,554
Cost of goods sold 12,437 13,633 40,008 43,468
Gross profit 23,855 27,752 75,184 76,086
Operating costs:        
Sales and marketing 8,889 9,575 28,152 29,555
Research and development 4,488 4,787 13,986 13,445
General and administrative 3,726 5,468 14,131 15,917
Amortization of purchased intangible assets 476 486 1,427 1,485
Total operating costs 17,579 20,316 57,696 60,402
Operating income 6,276 7,436 17,488 15,684
Interest income, net 62 164 207 404
Other income(expense) net (183) (359) 349 258
Income from continuing operations before income taxes 6,155 7,241 18,044 16,346
Provision for income taxes 1,473 1,314 3,970 3,433
Net income from continuing operations 4,682 5,927 14,074 12,913
Income (loss) from discontinued operations (173) (3,691) (493) (5,557)
Net income $ 4,509 $ 2,236 $ 13,581 $ 7,356
Basic income (loss) per share        
Continuing $ 0.12 $ 0.16 $ 0.37 $ 0.34
Discontinued $ 0.00 $ (0.10) $ (0.01) $ (0.14)
Total $ 0.12 $ 0.06 $ 0.36 $ 0.20
Diluted income (loss) per share        
Continuing $ 0.12 $ 0.15 $ 0.36 $ 0.33
Discontinued $ 0.00 $ (0.09) $ (0.01) $ (0.14)
Total $ 0.12 $ 0.06 $ 0.35 $ 0.19
Weighted average common shares outstanding:        
Basic 38,136 37,539 37,997 37,531
Diluted 38,833 38,606 38,676 38,610