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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 | 9 Months Ended
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Sep. 27, 2014 | Sep. 28, 2013 | Sep. 27, 2014 | Sep. 28, 2013
Revenue: |  |  |  |  |  |
Total revenue | $ 143,497 | $ 124,501 | $ 397,504 |  | $ 361,058 |
Cost of revenue: |  |  |  |  |  |
Total cost of revenue | 75,608 | 70,440 | 215,784 |  | 198,865 |
Gross margin: |  |  |  |  |  |
Gross margin | 67,889 | 54,061 | 181,720 |  | 162,193 |
Research and development | 17,343 | 15,212 | 51,522 | [1] | 45,617 | [1]
Selling and marketing | 15,844 | 16,317 | 53,911 | [1] | 49,323 | [1]
General and administrative | 12,008 | 11,495 | 35,938 | [1] | 39,348 | [1]
Other income (expense), net | (374) | 152 | (469) |  | (49) |
Income before income taxes | 22,320 | 11,189 | 39,880 |  | 27,856 |
Home Robots |  |  |  |  |  |
Revenue: |  |  |  |  |  |
Total revenue | 132,013 | 111,363 | 373,283 |  | 319,590 |
Cost of revenue: |  |  |  |  |  |
Total cost of revenue | 65,135 | 58,300 | 186,991 |  | 162,411 |
Gross margin: |  |  |  |  |  |
Gross margin | 66,878 | 53,063 | 186,292 |  | 157,179 |
Defense & Security |  |  |  |  |  |
Revenue: |  |  |  |  |  |
Total revenue | 10,667 | 10,094 | 21,369 |  | 33,664 |
Cost of revenue: |  |  |  |  |  |
Total cost of revenue | 4,977 | 5,981 | 11,725 |  | 18,348 |
Gross margin: |  |  |  |  |  |
Gross margin | 5,690 | 4,113 | 9,644 |  | 15,316 |
Other |  |  |  |  |  |
Revenue: |  |  |  |  |  |
Total revenue | 817 | 3,044 | 2,852 |  | 7,804 |
Cost of revenue: |  |  |  |  |  |
Total cost of revenue | 5,496 | 6,159 | 17,068 |  | 18,106 |
Gross margin: |  |  |  |  |  |
Gross margin | $ (4,679) | $ (3,115) | $ (14,216) |  | $ (10,302) |
[1] | Total stock-based compensation recorded in the three and nine months ended September 27, 2014 and September 28, 2013 included in the above figures breaks down by expense classification as follows: Three Months Ended Nine Months Ended September 27, 2014 September 28, 2013 September 27, 2014 September 28, 2013Cost of revenue$291 $250 $626 $496Research and development866 669 2,425 1,963Selling and marketing319 348 860 832General and administrative2,315 2,210 6,105 6,378

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- Definition The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 2 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(a),(d)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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