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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Oct. 02, 2015 | Sep. 30, 2016 | Oct. 02, 2015
Income Statement [Abstract] |  |  |  |
Product | $ 70,285 | $ 57,245 | $ 205,342 | $ 215,165
Services | 31,121 | 26,060 | 87,467 | 75,259
Total net revenue | 101,406 | 83,305 | 292,809 | 290,424
Product | 34,460 | 23,584 | 105,698 | 95,021
Services | 15,583 | 13,490 | 44,054 | 39,759
Total cost of revenue | 50,043 | 37,074 | 149,752 | 134,780
Total gross profit | 51,363 | 46,231 | 143,057 | 155,644
Operating expenses: |  |  |  |
Research and development | 24,202 | 21,679 | 74,272 | 65,824
Selling, general and administrative | 36,112 | 28,966 | 105,498 | 91,443
Amortization of intangibles | 3,009 | 1,446 | 9,606 | 4,338
Restructuring and related charges | (27) | 397 | 4,488 | 626
Total operating expenses | 63,296 | 52,488 | 193,864 | 162,231
Loss from operations | (11,933) | (6,257) | (50,807) | (6,587)
Interest (expense) income, net | (2,734) | 30 | (7,806) | 102
Other income (expense), net | (328) | 148 | (5) | (299)
Loss on impairment of long-term investment | (1,259) | 0 | (2,735) | (2,505)
Loss before income taxes | (16,254) | (6,079) | (61,353) | (9,289)
Provision for (benefit from) income taxes | (242) | (1,268) | 518 | (827)
Net loss | $ (16,012) | $ (4,811) | $ (61,871) | $ (8,462)
Net loss per share: |  |  |  |
Basic and diluted | $ (0.21) | $ (0.05) | $ (0.80) | $ (0.10)
Shares used in per share calculation: |  |  |  |
Basic and diluted | 78,092 | 87,991 | 77,475 | 88,359

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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