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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Revenue | $ 193.0 | $ 218.4
Cost of sales | 210.9 | 188.2
Gross profit (loss) | (17.9) | 30.2
Advanced technology license and decommissioning costs | 26.1 | 15.7
Selling, general and administrative | 39.9 | 43.7
Amortization of intangible assets | 6.6 | 10.6
Special charges for workforce reductions and advisory costs | 2.2 | 9.5
Other (income) | (0.3) | (4.6)
Operating (loss) | (92.4) | (44.7)
Gain on early extinguishment of debt | (0.5) | (33.6)
Nonoperating components of net periodic benefit expense (income) | 10.6 | (27.2)
Interest expense | 4.1 | 5.3
Investment income | (2.5) | (1.3)
Income (loss) before income taxes | (104.1) | 12.1
Provision (benefit) for income taxes | 0.0 | (0.1)
Net income (loss) | (104.1) | 12.2
Preferred stock dividends, undeclared and cumulative | 7.8 | 6.9
Net income (loss) allocable to common stockholders | $ (111.9) | $ 5.3
Net loss per share - basic and diluted | $ (12.23) | $ 0.58
Weighted-average number of shares outstanding: |  |
Average number of common shares outstanding, basic and diluted | 9,151 | 9,081
Weighted Average Number of Shares Outstanding, Diluted | 9,151 | 9,081
Product [Member] |  |
Cost of sales | $ 187.7 | $ 162.7
Service [Member] |  |
Cost of sales | $ 23.2 | $ 25.5

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