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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Revenue from Contract with Customer, Excluding Assessed Tax | $ 10.6 | $ 39.4 | $ 49.3 | $ 75.1
Revenue | 10.6 | 39.4 | 49.3 | 75.1
Cost of sales | 14.9 | 50.1 | 59.1 | 91.1
Gross profit (loss) | (4.3) | (10.7) | (9.8) | (16.0)
Advanced technology license and decommissioning costs | 5.1 | 5.4 | 11.7 | 13.4
Selling, general and administrative | 7.7 | 9.7 | 15.8 | 20.9
Amortization of intangible assets | 1.2 | 1.5 | 2.3 | 2.8
Special charges for workforce reductions and advisory costs | (2.9) | 0.3 | (3.0) | 0.9
Other (income) | (0.1) | (0.2) | (0.5) | (0.3)
Operating (loss) | (15.3) | (27.4) | (36.1) | (53.7)
Nonoperating components of net periodic benefit expense (income) | 0.0 | (1.7) | (0.1) | (3.3)
Interest expense | 1.0 | 1.0 | 2.0 | 2.0
Investment income | (0.7) | (0.6) | (1.4) | (1.2)
Income (loss) before income taxes | (15.6) | (26.1) | (36.6) | (51.2)
Provision (benefit) for income taxes | 0.0 | 0.0 | (0.1) | (0.1)
Net income (loss) | (15.6) | (26.1) | (36.5) | (51.1)
Preferred stock dividends, undeclared and cumulative | 2.0 | 2.0 | 4.0 | 4.0
Net income (loss) allocable to common stockholders | $ (17.6) | $ (28.1) | $ (40.5) | $ (55.1)
Net loss per share - basic and diluted | $ (1.84) | $ (3.08) | $ (4.24) | $ (6.05)
Weighted-average number of shares outstanding: |  |  |  |
Average number of common shares outstanding, basic and diluted | 9,565 | 9,118 | 9,549 | 9,111
Weighted Average Number of Shares Outstanding, Diluted | 9,565 | 9,118 | 9,549 | 9,111
Separative Work Units [Member] |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | $ 0.0 | $ 32.9 | $ 12.4 | $ 50.6
Uranium [Member] |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 2.6 | 0.0 | 25.3 | 3.6
Product [Member] |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 2.6 | 32.9 | 37.7 | 54.2
Cost of sales | 7.7 | 42.9 | 46.0 | 77.7
Service [Member] |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 8.0 | 6.5 | 11.6 | 20.9
Cost of sales | $ 7.2 | $ 7.2 | $ 13.1 | $ 13.4

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