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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