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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 26, 2020 | Jun. 28, 2019 | Jun. 26, 2020 | Jun. 28, 2019
Total net revenue | [1] | $ 73,994 | $ 84,865 | $ 152,411 | $ 164,971
Total cost of revenue |  | 36,221 | 40,937 | 77,900 | 79,194
Total gross profit |  | 37,773 | 43,928 | 74,511 | 85,777
Operating expenses: |  |  |  |  |
Research and development |  | 19,498 | 21,313 | 41,621 | 42,714
Selling, general and administrative |  | 27,005 | 29,319 | 58,223 | 57,330
Amortization of intangibles |  | 742 | 784 | 1,512 | 1,572
Restructuring and related charges |  | 82 | 276 | 758 | 333
Total operating expenses |  | 47,327 | 51,692 | 102,114 | 101,949
Loss from operations |  | (9,554) | (7,764) | (27,603) | (16,172)
Interest expense, net |  | (3,062) | (2,956) | (5,965) | (5,862)
Loss on debt extinguishment |  | (834) |  | (834) | 0
Other expense, net |  | (373) | (428) | (646) | (739)
Loss before income taxes |  | (13,823) | (11,148) | (35,048) | (22,773)
Provision for income taxes |  | 1,578 | 697 | 2,307 | 378
Net loss |  | $ (15,401) | $ (11,845) | $ (37,355) | $ (23,151)
Net loss per share: |  |  |  |  |
Basic and Diluted |  | $ (0.16) | $ (0.13) | $ (0.39) | $ (0.26)
Shares used in per share calculation: |  |  |  |  |
Basic and Diluted |  | 96,727 | 88,931 | 96,255 | 88,554
Appliance & Integration [Member] |  |  |  |  |
Total net revenue |  | $ 42,224 | $ 54,417 | $ 89,976 | $ 106,782
Total cost of revenue |  | 22,784 | 29,312 | 49,071 | 56,366
SaaS & Service [Member] |  |  |  |  |
Total net revenue |  | 31,770 | 30,448 | 62,435 | 58,189
Total cost of revenue |  | $ 13,437 | $ 11,625 | $ 28,829 | $ 22,828
[1] | Revenue is attributed to countries based on the location of the customer.

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