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Consolidated Statements of Income (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 29, 2014 | Mar. 30, 2013
Revenue: |  |
Total revenue | $ 114,204 | $ 106,195
Cost of revenue: |  |
Total cost of revenue | 62,494 | 59,668
Gross margin | 51,710 | 46,527
Operating expenses: |  |
Research and development | 16,934 | 14,408
Selling and marketing | 14,532 | 10,697
General and administrative | 12,264 | 12,458
Total operating expenses | 43,730 | 37,563
Operating income | 7,980 | 8,964
Other income (expense), net | (187) | (96)
Income before income taxes | 7,793 | 8,868
Income tax expense | 2,513 | 513
Net income | 5,280 | 8,355
Net income per share |  |
Basic, in dollars per share | $ 0.18 | $ 0.30
Diluted, in dollars per share | $ 0.18 | $ 0.29
Number of shares used in calculations per share |  |
Basic, in shares | 29,189 | 27,930
Diluted, in shares | 30,033 | 28,558
Total stock-based compensation recorded in the three months ended March 30, 2013 and March 31, 2012 included in the above figures breaks down by expense classification as follows: |  |
Stock based compensation | 3,078 | 2,929
Cost of Sales [Member] |  |
Total stock-based compensation recorded in the three months ended March 30, 2013 and March 31, 2012 included in the above figures breaks down by expense classification as follows: |  |
Stock based compensation | 169 | 118
Research and development |  |
Total stock-based compensation recorded in the three months ended March 30, 2013 and March 31, 2012 included in the above figures breaks down by expense classification as follows: |  |
Stock based compensation | 731 | 501
Selling and marketing |  |
Total stock-based compensation recorded in the three months ended March 30, 2013 and March 31, 2012 included in the above figures breaks down by expense classification as follows: |  |
Stock based compensation | 338 | 366
General and administrative |  |
Total stock-based compensation recorded in the three months ended March 30, 2013 and March 31, 2012 included in the above figures breaks down by expense classification as follows: |  |
Stock based compensation | $ 1,840 | $ 1,944

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