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Consolidated Statements of Income (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Apr. 02, 2016
Mar. 28, 2015
Revenue $ 130,804 $ 117,961
Cost of revenue (1) [1] 68,843 64,253
Gross margin 61,961 53,708
Operating expenses:    
Research and development (1) [1] 19,728 19,032
Selling and marketing (1) [1] 19,940 14,188
General and administrative (1) [1] 16,764 12,589
Total operating expenses 56,432 45,809
Operating income 5,529 7,899
Other income (expense), net 200 (794)
Income before income taxes 5,729 7,105
Income tax expense 1,797 2,351
Net income $ 3,932 $ 4,754
Net income per share    
Basic $ 0.14 $ 0.16
Diluted $ 0.13 $ 0.16
Number of weighted average common shares used in calculations per share    
Basic 29,004 29,653
Diluted 29,474 30,230
Stock-based compensation $ 3,892 $ 3,107
Cost of revenue    
Number of weighted average common shares used in calculations per share    
Stock-based compensation 221 215
Research and development    
Number of weighted average common shares used in calculations per share    
Stock-based compensation 829 832
Selling and marketing    
Number of weighted average common shares used in calculations per share    
Stock-based compensation 485 309
General and administrative    
Number of weighted average common shares used in calculations per share    
Stock-based compensation $ 2,357 $ 1,751
[1] Total stock-based compensation recorded in the three months ended April 2, 2016 and March 28, 2015 included in the above figures breaks down by expense classification as follows: Three Months Ended April 2, 2016 March 28, 2015Cost of revenue$221 $215Research and development829 832Selling and marketing485 309General and administrative2,357 1,751