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Condensed Consolidated Statements of Operations (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Income Statement [Abstract]        
Revenue $ 60,027 $ 52,633 $ 190,555 $ 139,111
Cost of goods sold 23,755 17,038 78,111 46,699
Gross profit 36,272 35,595 112,444 92,412
Operating costs:        
Sales and marketing 8,842 10,729 28,616 32,410
Research and development 4,378 4,441 13,465 14,784
General and administrative 8,506 5,440 21,730 16,447
Amortization of purchased intangible assets 1,091 1,143 3,348 3,392
Total operating costs 22,817 21,753 67,159 67,033
Operating income 13,455 13,842 45,285 25,379
Interest income 107 35 284 70
Other income (expense) (25) (986) (28) (300)
Income from continuing operations before income taxes 13,537 12,891 45,541 25,149
Provision for income taxes 2,351 1,682 6,831 3,521
Net income from continuing operations 11,186 11,209 38,710 21,628
Income (loss) from discontinued operations (4) (46) (42) (68)
Net income $ 11,182 $ 11,163 $ 38,668 $ 21,560
Basic income (loss) per share        
Continuing $ 0.28 $ 0.28 $ 0.97 $ 0.55
Discontinued 0.00 0.00 0.00 0.00
Total 0.28 0.28 0.97 0.55
Diluted income (loss) per share        
Continuing 0.28 0.28 0.97 0.55
Discontinued 0.00 0.00 0.00 0.00
Total $ 0.28 $ 0.28 $ 0.97 $ 0.55
Weighted average common shares outstanding:        
Basic 39,580 39,358 39,563 39,330
Diluted 39,733 39,541 39,711 39,467