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Industry Segment Geographic Information and Significant Customers (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 02, 2016 | Sep. 26, 2015 | Jun. 27, 2015 | Mar. 28, 2015 | Dec. 27, 2014 | Sep. 27, 2014 | Jun. 28, 2014 | Mar. 29, 2014 | Jan. 02, 2016 | Dec. 27, 2014 | Dec. 28, 2013
Revenue: |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  | $ 206,420 | $ 143,609 | $ 148,788 | $ 117,961 | $ 159,342 | $ 143,497 | $ 139,803 | $ 114,204 | $ 616,778 | $ 556,846 | $ 487,401
Cost of revenue: |  |  |  |  |  |  |  |  |  |  |  |
Total cost of revenue |  |  |  |  |  |  |  |  |  | 327,852 | 298,791 | 266,247
Gross margin: |  |  |  |  |  |  |  |  |  |  |  |
Gross margin |  | $ 95,327 | $ 69,858 | $ 70,033 | $ 53,708 | $ 76,335 | $ 67,889 | $ 62,121 | $ 51,710 | 288,926 | 258,055 | 221,154
Research and development | [1] |  |  |  |  |  |  |  |  | 76,071 | 69,408 | 63,649
Selling and marketing | [1] |  |  |  |  |  |  |  |  | 97,772 | 86,091 | 71,529
General and administrative | [1] |  |  |  |  |  |  |  |  | 54,465 | 49,439 | 53,358
Other expense, net |  |  |  |  |  |  |  |  |  | 2,353 | (708) | (203)
Income before income taxes |  |  |  |  |  |  |  |  |  | 62,971 | 52,409 | 32,415
Home Robots [Member] |  |  |  |  |  |  |  |  |  |  |  |
Revenue: |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  |  | 559,619 | 507,414 | 427,853
Cost of revenue: |  |  |  |  |  |  |  |  |  |  |  |
Total cost of revenue |  |  |  |  |  |  |  |  |  | 274,613 | 251,095 | 217,011
Gross margin: |  |  |  |  |  |  |  |  |  |  |  |
Gross margin |  |  |  |  |  |  |  |  |  | 285,006 | 256,319 | 210,842
Defense & Security Robots [Member] |  |  |  |  |  |  |  |  |  |  |  |
Revenue: |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  |  | 55,004 | 45,502 | 50,003
Cost of revenue: |  |  |  |  |  |  |  |  |  |  |  |
Total cost of revenue |  |  |  |  |  |  |  |  |  | 29,737 | 24,409 | 24,975
Gross margin: |  |  |  |  |  |  |  |  |  |  |  |
Gross margin |  |  |  |  |  |  |  |  |  | 25,267 | 21,093 | 25,028
Other Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |
Revenue: |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  |  | 2,155 | 3,930 | 9,545
Cost of revenue: |  |  |  |  |  |  |  |  |  |  |  |
Total cost of revenue |  |  |  |  |  |  |  |  |  | 23,502 | 23,287 | 24,261
Gross margin: |  |  |  |  |  |  |  |  |  |  |  |
Gross margin |  |  |  |  |  |  |  |  |  | $ (21,347) | $ (19,357) | $ (14,716)
[1] | Stock-based compensation recorded in fiscal 2015, 2014 and 2013 breaks down by expense classification as follows: Fiscal Year Ended January 2, 2016 December 27, 2014 December 28, 2013 (In thousands)Cost of revenue$1,076 $865 $700Research and development3,256 3,359 2,700Selling and marketing1,457 1,296 1,246General and administrative8,394 8,258 8,763

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