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Industry Segment, Geographic Information and Significant Customers - Segment Information about Revenue, Cost of Revenue, Gross Margin and Income before Income Taxes (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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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: |  |
Gross margin | 51,710 | 46,527
Research and development | 16,934 | 14,408
Selling and marketing | 14,532 | 10,697
General and administrative | 12,264 | 12,458
Other income (expense), net | (187) | (96)
Income before income taxes | 7,793 | 8,868
Home Robots |  |
Revenue: |  |
Total revenue | 108,035 | 92,699
Cost of revenue: |  |
Total cost of revenue | 53,595 | 48,025
Gross margin: |  |
Gross margin | 54,440 | 44,674
Defense & Security |  |
Revenue: |  |
Total revenue | 5,602 | 11,100
Cost of revenue: |  |
Total cost of revenue | 3,518 | 5,825
Gross margin: |  |
Gross margin | 2,084 | 5,275
Other |  |
Revenue: |  |
Total revenue | 567 | 2,396
Cost of revenue: |  |
Total cost of revenue | 5,381 | 5,818
Gross margin: |  |
Gross margin | $ (4,814) | $ (3,422)

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