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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jul. 01, 2016 | Jul. 03, 2015 | Jul. 01, 2016 | Jul. 03, 2015
Income Statement [Abstract] |  |  |  |
Product | $ 77,413 | $ 77,447 | $ 135,057 | $ 157,920
Services | 32,158 | 25,656 | 56,346 | 49,199
Total net revenue | 109,571 | 103,103 | 191,403 | 207,119
Product | 44,049 | 35,977 | 71,238 | 71,437
Services | 14,482 | 12,741 | 28,471 | 26,269
Total cost of revenue | 58,531 | 48,718 | 99,709 | 97,706
Total gross profit | 51,040 | 54,385 | 91,694 | 109,413
Operating expenses: |  |  |  |
Research and development | 26,507 | 21,816 | 50,070 | 44,145
Selling, general and administrative | 36,516 | 31,281 | 69,386 | 62,477
Amortization of intangibles | 4,232 | 1,446 | 6,597 | 2,892
Restructuring and related charges | 1,903 | 185 | 4,515 | 229
Total operating expenses | 69,158 | 54,728 | 130,568 | 109,743
Loss from operations | (18,118) | (343) | (38,874) | (330)
Interest (expense) income, net | (2,651) | 17 | (5,072) | 72
Other income (expense), net | 332 | 59 | 323 | (447)
Loss on impairment of long-term investment | 0 | 0 | (1,476) | (2,505)
Loss before income taxes | (20,437) | (267) | (45,099) | (3,210)
Provision for income taxes | 242 | 727 | 760 | 441
Net loss | $ (20,679) | $ (994) | $ (45,859) | $ (3,651)
Net loss per share: |  |  |  |
Basic and diluted | $ (0.27) | $ (0.01) | $ (0.59) | $ (0.04)
Shares used in per share calculation: |  |  |  |
Basic and diluted | 77,342 | 88,426 | 77,168 | 88,541

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