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Consolidated Statements of Operations (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Consolidated Statements of Operations [Abstract]      
Revenue $ 154,029 $ 168,082 $ 107,963
Cost of goods sold 54,464 59,970 31,997
Gross profit 99,565 108,112 75,966
Operating costs:      
Sales and marketing 37,768 40,294 31,027
Research and development 18,794 18,636 13,568
General and administrative 20,071 22,450 18,538
Amortization of purchased intangible assets 1,905 1,967 443
Total operating costs 78,538 83,347 63,576
Operating income 21,027 24,765 12,390
Interest income, net 261 543 324
Other income, net 409 500 698
Income from continuing operations before income taxes 21,697 25,808 13,412
Provision for income taxes 5,468 1,557 2,606
Net income-continuing operations 16,229 24,251 10,806
Net (loss) from discontinued operations (630) (6,118) 0
Net income $ 15,599 $ 18,133 $ 10,806
Basic income (loss) per share:      
Continuing operations $ 0.43 $ 0.65 $ 0.29
Discontinued operations $ (0.02) $ (0.16) $ 0.00
Total net income per share $ 0.41 $ 0.48 $ 0.29
Diluted income (loss) per share:      
Continuing operations $ 0.42 $ 0.63 $ 0.28
Discontinued operations $ (0.02) $ (0.16) $ 0.00
Total net income per share $ 0.40 $ 0.47 $ 0.28
Weighted average common shares outstanding:      
Basic 38,068 37,555 37,413
Diluted 38,677 38,568 38,241