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Condensed Consolidated Statements of Operations (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Income Statement [Abstract]        
Revenue $ 65,393 $ 47,654 $ 130,528 $ 86,477
Cost of goods sold 26,895 16,633 54,356 29,660
Gross profit 38,498 31,021 76,172 56,817
Operating costs:        
Sales and marketing 9,982 11,310 19,775 21,681
Research and development 4,538 5,202 9,087 10,343
General and administrative 7,105 5,734 13,224 11,007
Amortization of purchased intangible assets 1,120 1,129 2,256 2,249
Total operating costs 22,745 23,375 44,342 45,280
Operating income 15,753 7,646 31,830 11,537
Interest income, net 97 10 177 34
Other income (expense), net 273 249 (3) 687
Income from continuing operations before income taxes 16,123 7,905 32,004 12,258
Provision for income taxes 2,257 1,012 4,481 1,839
Net income from continuing operations 13,866 6,893 27,523 10,419
Income (loss) from discontinued operations (14) (7) (37) (22)
Net income $ 13,852 $ 6,886 $ 27,486 $ 10,397
Basic income (loss) per share        
Continuing $ 0.35 $ 0.18 $ 0.69 $ 0.26
Discontinued 0.00 0.00 0.00 0.00
Total 0.35 0.18 0.69 0.26
Diluted income (loss) per share        
Continuing 0.35 0.17 0.69 0.26
Discontinued 0.00 0.00 0.00 0.00
Total $ 0.35 $ 0.17 $ 0.69 $ 0.26
Weighted average common shares outstanding:        
Basic 39,580 39,358 39,554 39,315
Diluted 39,738 39,471 39,699 39,430