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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Oct. 02, 2015 | Sep. 26, 2014 | Oct. 02, 2015 | Sep. 26, 2014
Income Statement [Abstract] |  |  |  |
Product | $ 57,245 | $ 84,583 | $ 215,165 | $ 259,371
Services | 26,060 | 23,478 | 75,259 | 66,311
Total net revenue | 83,305 | 108,061 | 290,424 | 325,682
Product | 23,584 | 41,802 | 95,021 | 134,336
Services | 13,490 | 12,831 | 39,759 | 35,789
Total cost of revenue | 37,074 | 54,633 | 134,780 | 170,125
Total gross profit | 46,231 | 53,428 | 155,644 | 155,557
Operating expenses: |  |  |  |
Research and development | 21,679 | 22,803 | 65,824 | 70,176
Selling, general and administrative | 28,966 | 32,114 | 91,443 | 98,640
Amortization of intangibles | 1,446 | 1,661 | 4,338 | 5,329
Restructuring and related charges | 397 | 388 | 626 | 821
Total operating expenses | 52,488 | 56,966 | 162,231 | 174,966
Loss from operations | (6,257) | (3,538) | (6,587) | (19,409)
Interest income, net | 30 | 47 | 102 | 191
Other income (expense), net | 148 | (261) | (299) | (376)
Loss on impairment of long-term investment |  |  | (2,505) | 0
Loss before income taxes | (6,079) | (3,752) | (9,289) | (19,594)
(Benefit from) provision for income taxes | (1,268) | (4,830) | (827) | 21,800
Net income (loss) | $ (4,811) | $ 1,078 | $ (8,462) | $ (41,394)
Net income (loss) per share: |  |  |  |
Basic | $ (0.05) | $ 0.01 | $ (0.10) | $ (0.44)
Diluted | $ (0.05) | $ 0.01 | $ (0.10) | $ (0.44)
Shares used in per share calculation: |  |  |  |
Basic | 87,991 | 90,618 | 88,359 | 94,113
Diluted | 87,991 | 91,800 | 88,359 | 94,113

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- Definition Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1448-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Weighted-Average Number of Common Shares Outstanding -URI http://asc.fasb.org/extlink&oid=6528421 + Details
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