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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, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Income Statement [Abstract]        
Revenue $ 52,633 $ 39,156 $ 139,111 $ 111,782
Cost of goods sold 17,038 14,102 46,699 39,757
Gross profit 35,595 25,054 92,412 72,025
Operating costs:        
Sales and marketing 10,729 9,375 32,410 29,476
Research and development 4,441 5,065 14,784 15,257
General and administrative 5,440 4,469 16,447 15,414
Amortization of purchased intangible assets 1,143 1,114 3,392 2,207
Total operating costs 21,753 20,023 67,033 62,354
Operating income 13,842 5,031 25,379 9,671
Interest income, net 35 48 70 130
Other income, net (986) (304) (300) 109
Income from continuing operations before income taxes 12,891 4,775 25,149 9,910
Provision for income taxes 1,682 1,406 3,521 2,279
Net income from continuing operations 11,209 3,369 21,628 7,631
Income (loss) from discontinued operations (46) (47) (68) 286
Net income $ 11,163 $ 3,322 $ 21,560 $ 7,917
Basic income (loss) per share        
Continuing $ 0.28 $ 0.09 $ 0.55 $ 0.19
Discontinued $ 0.00 $ 0.00 $ 0.00 $ 0.01
Total $ 0.28 $ 0.09 $ 0.55 $ 0.20
Diluted income (loss) per share        
Continuing $ 0.28 $ 0.08 $ 0.55 $ 0.19
Discontinued $ 0.00 $ 0.00 $ 0.00 $ 0.01
Total $ 0.28 $ 0.08 $ 0.55 $ 0.20
Weighted average common shares outstanding:        
Basic 39,358 38,910 39,330 38,836
Diluted 39,541 39,226 39,467 39,172