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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
Consolidated Statements Of Operations [Abstract]      
Revenue $ 168,082 $ 107,963 $ 101,695
Cost of goods sold 59,970 31,997 30,535
Gross profit 108,112 75,966 71,160
Operating costs:      
Sales and marketing 40,294 31,027 30,299
Research and development 18,636 13,568 11,582
General and administrative 22,450 18,538 16,183
Amortization of purchased intangible assets 1,967 443 453
Total operating costs 83,347 63,576 58,517
Operating income 24,765 12,390 12,643
Interest income, net 543 324 572
Other income, net 500 698 2,107
Income from continuing operations before income taxes 25,808 13,412 15,322
Provision for income taxes 1,557 2,606 3,460
Net income-continuing operations 24,251 10,806 11,862
Net income (loss) from discontinued operations (6,118) 0 0
Net income $ 18,133 $ 10,806 $ 11,862
Basic income (loss) per share:      
Continuing operations $ 0.65 $ 0.29 $ 0.32
Discontinued operations $ (0.16) $ 0.00 $ 0.00
Total net income per share $ 0.48 $ 0.29 $ 0.32
Diluted income (loss) per share:      
Continuing operations $ 0.63 $ 0.28 $ 0.31
Discontinued operations $ (0.16) $ 0.00 $ 0.00
Total net income per share $ 0.47 $ 0.28 $ 0.31
Weighted average common shares outstanding:      
Basic 37,555 37,413 37,319
Diluted 38,568 38,241 38,084