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CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($) shares in Millions, $ in Millions | 12 Months Ended
--- | ---
Dec. 30, 2018 | Dec. 31, 2017 | Dec. 25, 2016
Total revenues | $ 618.0 | $ 603.3 | $ 541.9
Total costs | 448.3 | 445.7 | 421.4
Gross profit | 169.7 | 157.6 | 120.5
Selling, general and administrative expenses | 119.8 | 127.3 | 114.6
Research and development expenses | 15.6 | 17.8 | 13.9
Impairment of goodwill | 0.0 | 24.2 | 0.0
Restructuring expenses and other | 3.8 | 0.3 | 10.0
Operating income (loss) from continuing operations | 30.5 | (12.0) | (18.0)
Other income (expense): |  |  |
Interest expense, net | (20.8) | (28.6) | (34.7)
Gain (loss) on extinguishment of debt | 0.0 | (17.3) | 0.2
Other income (loss), net | (1.0) | 0.8 | 0.7
Total other expense, net | (21.8) | (45.1) | (33.8)
Income (loss) from continuing operations before income taxes | 8.7 | (57.1) | (51.8)
Provision (benefit) for income taxes from continuing operations | 4.6 | (10.2) | 5.8
Income (loss) from continuing operations | 4.1 | (46.9) | (57.6)
Income (loss) from operations of discontinued component (including gain on disposal of $0.0 million for the year ended December 30, 2018) | (9.4) | 6.3 | (0.6)
Income tax expense (benefit) | (1.8) | 2.1 | 2.3
Income (loss) from discontinued operations | (7.6) | 4.2 | (2.9)
Net loss | $ (3.5) | $ (42.7) | $ (60.5)
Basic income and loss per common share: |  |  |
Income (loss) from continuing operations (in dollars per share) | $ 0.04 | $ (0.52) | $ (0.94)
Income (loss) from discontinued operations (in dollars per share) | (0.07) | 0.04 | (0.05)
Net income (loss) per common share (in dollars per share) | (0.03) | (0.48) | (0.99)
Diluted income and loss per common share: |  |  |
Income (loss) from continuing operations (in dollars per share) | 0.04 | (0.52) | (0.94)
Income (loss) from discontinued operations (in dollars per share) | (0.07) | 0.04 | (0.05)
Net income (loss) per common share (in dollars per share) | $ (0.03) | $ (0.48) | $ (0.99)
Weighted average common shares outstanding: |  |  |
Basic (in shares) | 103.8 | 89.5 | 61.3
Diluted (in shares) | 106.1 | 89.5 | 61.3
Comprehensive Loss |  |  |
Net income (loss) | $ (3.5) | $ (42.7) | $ (60.5)
Other comprehensive income (loss): |  |  |
Change in cumulative translation adjustment | 0.4 | 0.1 | (0.5)
Postretirement benefit reserve adjustment net of tax expense | 0.3 | 0.2 | 0.2
Other comprehensive income (loss), net of tax | 0.7 | 0.3 | (0.3)
Comprehensive loss | (2.8) | (42.4) | (60.8)
Service |  |  |
Total revenues | 200.7 | 197.8 | 221.3
Total costs | 137.8 | 138.6 | 162.1
Product |  |  |
Total revenues | 417.3 | 405.5 | 320.6
Total costs | $ 310.5 | $ 307.1 | $ 259.3

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