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Condensed Consolidated Statements of Operations (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Revenue        
Product and license $ 38,421 $ 34,251 $ 104,454 $ 118,786
Services and other 12,705 9,397 34,331 25,922
Total revenue 51,126 43,648 138,785 144,708
Cost of goods sold        
Products and license 12,083 11,400 32,668 39,925
Services and other 2,397 2,198 7,511 6,078
Total cost of goods sold 14,480 13,598 40,179 46,003
Gross profit 36,646 30,050 98,606 98,705
Operating costs        
Sales and marketing 13,956 13,453 42,997 41,982
Research and development 5,493 5,807 17,669 17,617
General and administrative 9,882 7,682 26,323 25,071
Amortization of purchased intangible assets 2,203 2,196 6,603 6,622
Total operating costs 31,534 29,138 93,592 91,292
Operating income 5,112 912 5,014 7,413
Interest income, net 386 229 1,016 504
Other income (expense), net (185) 118 402 731
Income before income taxes 5,313 1,259 6,432 8,648
Provision for income taxes 2,558 781 2,994 3,146
Net income $ 2,755 $ 478 $ 3,438 $ 5,502
Basic income per share $ 0.07 $ 0.01 $ 0.09 $ 0.14
Diluted income per share $ 0.07 $ 0.01 $ 0.09 $ 0.14
Weighted average common shares outstanding:        
Basic (in shares) 39,811 39,736 39,792 39,709
Diluted (in shares) 39,821 39,834 39,802 39,786