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Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Statement [Abstract]      
Revenue $ 241,443 $ 201,537 $ 155,047
Cost of goods sold 95,351 73,771 55,176
Gross profit 146,092 127,766 99,871
Operating costs:      
Sales and marketing 39,670 43,362 40,323
Research and development 18,538 19,497 21,315
General and administrative 32,489 22,287 21,196
Amortization of purchased intangible assets 4,942 4,532 3,325
Total operating costs 95,639 89,678 86,159
Operating income 50,453 38,088 13,712
Interest income 364 118 162
Other income (expense), net 81 (286) 240
Income from continuing operations before income taxes 50,898 37,920 14,114
Provision for income taxes 8,704 5,309 3,147
Net income-continuing operations 42,194 32,611 10,967
Net income (loss) from discontinued operations (43) 873 180
Net income $ 42,151 $ 33,484 $ 11,147
Basic income (loss) per share:      
Continuing operations $ 1.07 $ 0.83 $ 0.28
Discontinued operations 0.00 0.02 0.00
Total net income per share 1.07 0.85 0.28
Diluted income (loss) per share:      
Continuing operations 1.06 0.83 0.28
Discontinued Operations 0.00 0.02 0.00
Total net income per share $ 1.06 $ 0.85 $ 0.28
Weighted average common shares outstanding:      
Basic 39,568 39,337 38,873
Diluted 39,736 39,499 39,158