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Condensed Consolidated Statements of Operations (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Income Statement [Abstract]        
Net revenue $ 43,648 $ 60,027 $ 144,707 $ 190,555
Cost of goods sold 11,547 23,755 40,153 78,111
Gross profit 32,101 36,272 104,554 112,444
Operating costs:        
Sales and marketing 14,535 8,842 45,266 28,616
Research and development 6,776 4,378 20,179 13,465
General and administrative 7,682 8,506 25,074 21,730
Amortization of purchased intangible assets 2,196 1,091 6,623 3,348
Total operating costs 31,189 22,817 97,142 67,159
Operating income 912 13,455 7,412 45,285
Interest income, net 229 107 504 284
Other income (expense), net 134 (25) 749 (28)
Income from continuing operations before income taxes 1,275 13,537 8,665 45,541
Provision for income taxes 781 2,351 3,145 6,831
Net income from continuing operations 494 11,186 5,520 38,710
Income (loss) from discontinued operations (16) (4) (17) (42)
Net income $ 478 $ 11,182 $ 5,503 $ 38,668
Basic income (loss) per share        
Continuing $ 0.01 $ 0.28 $ 0.14 $ 0.97
Discontinued 0.00 0.00 0.00 0.00
Total 0.01 0.28 0.14 0.97
Diluted income (loss) per share        
Continuing 0.01 0.28 0.14 0.97
Discontinued 0.00 0.00 0.00 0.00
Total $ 0.01 $ 0.28 $ 0.14 $ 0.97
Weighted average common shares outstanding:        
Basic 39,736 39,580 39,709 39,563
Diluted 39,834 39,733 39,786 39,711