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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Income Statement [Abstract] |  |  |  |
Service revenue, net | $ 808 | $ 316 | $ 2,498 | $ 935
Clinical research grants | 13 | 9 | 75 | 9
Other | 2 | 2 | 5 | 2
Revenue, net of contractual allowances and adjustments | 823 | 327 | 2,578 | 946
less allowance for doubtful accounts | (173) | (57) | (399) | (168)
Net sales | 650 | 270 | 2,179 | 778
Service revenues | 653 | 347 | 1,926 | 813
Clinical research grants | 8 |  | 65 |
Total cost of sales | 661 | 347 | 1,991 | 813
Gross (loss) profit | (11) | (77) | 188 | (35)
OPERATING EXPENSES: |  |  |  |
Operating expenses | 2,831 | 2,541 | 7,367 | 3,981
Impairment of goodwill | 1,275 | 1,015 | 1,569 | 1,015
TOTAL OPERATING EXPENSES | 4,106 | 3,556 | 8,936 | 4,996
OPERATING LOSS | (4,117) | (3,633) | (8,748) | (5,031)
OTHER INCOME (EXPENSE): |  |  |  |
Interest expense, net | (120) | (1,883) | (176) | (2,265)
Warrant revaluation and modification | 33 |  | 617 | (3)
Derivative revaluation | 117 |  | 116 |
Gain on settlement liability, net | 66 | 647 | 213 | 647
Gain (loss) on extinguishment of debt | 284 | (1,338) | 284 | (1,391)
Loss on issuance of convertible notes | (112) |  | (1,040) |
Merger advisory fees |  | (73) |  | (2,676)
Loss on settlement of equity instrument |  |  | (385) |
Total other nonoperating income (expense) | 268 | (2,647) | (371) | (5,688)
LOSS BEFORE INCOME TAXES | (3,849) | (6,280) | (9,119) | (10,719)
INCOME TAX EXPENSE | 0 | 0 | 0 | 0
NET LOSS | (3,849) | (6,280) | (9,119) | (10,719)
Deemed dividends related to beneficial conversion feature of preferred stock and fair value of consideration issued to induce conversion of preferred stock |  | (3,764) | (3,848) | (9,012)
Preferred dividends |  | (84) |  | (84)
TOTAL DIVIDENDS |  | (3,848) | (3,848) | (9,096)
NET LOSS AVAILABLE TO COMMON STOCKHOLDERS | $ (3,849) | $ (10,128) | $ (12,967) | $ (19,815)
BASIC AND DILUTED LOSS PER COMMON SHARE (IN DOLLARS PER SHARE) | $ (0.17) | $ (1.36) | $ (0.69) | $ (6.96)
BASIC AND DILUTED WEIGHTED-AVERAGE SHARES OF COMMON STOCK OUTSTANDING (IN SHARES) | 23,202,208 | 7,430,741 | 18,877,601 | 2,846,221

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