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Condensed Consolidated Statements of Operations (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Income Statement [Abstract]        
Revenue $ 54,293 $ 65,393 $ 101,059 $ 130,528
Cost of goods sold 15,768 26,895 28,606 54,356
Gross profit 38,525 38,498 72,453 76,172
Operating costs:        
Sales and marketing 16,766 9,982 30,731 19,775
Research and development 7,105 4,538 13,403 9,087
General and administrative 9,065 7,105 17,392 13,224
Amortization of purchased intangible assets 2,203 1,120 4,427 2,256
Total operating costs 35,139 22,745 65,953 44,342
Operating income 3,386 15,753 6,500 31,830
Interest income, net 166 97 275 177
Other income (expense), net 253 273 615 (3)
Income from continuing operations before income taxes 3,805 16,123 7,390 32,004
Provision for income taxes 979 2,257 2,365 4,481
Net income from continuing operations 2,826 13,866 5,025 27,523
Income (loss) from discontinued operations (1) (14) (1) (37)
Net income $ 2,825 $ 13,852 $ 5,024 $ 27,486
Basic income (loss) per share        
Continuing $ 0.07 $ 0.35 $ 0.13 $ 0.69
Discontinued 0.00 0.00 0.00 0.00
Total 0.07 0.35 0.13 0.69
Diluted income (loss) per share        
Continuing 0.07 0.35 0.13 0.69
Discontinued 0.00 0.00 0.00 0.00
Total $ 0.07 $ 0.35 $ 0.13 $ 0.69
Weighted average common shares outstanding:        
Basic 39,710 39,580 39,695 39,554
Diluted 39,769 39,738 39,762 39,699