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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Income Statement [Abstract] |  |  |  |
Service revenue, net | $ 899 | $ 316 | $ 1,690 | $ 619
Clinical research grants | 62 |  | 62 |
Other | (2) |  | 3 |
Revenue, net of contractual allowances and adjustments | 959 | 316 | 1,755 | 619
less allowance for doubtful accounts | (142) | (56) | (226) | (111)
Net sales | 817 | 260 | 1,529 | 508
Service revenues | 585 | 284 | 1,273 | 466
Clinical research grants | 57 |  | 57 |
Total cost of sales | 642 | 284 | 1,330 | 466
Gross profit | 175 | (24) | 199 | 42
OPERATING EXPENSES: |  |  |  |
Operating expenses | 2,358 | 777 | 4,536 | 1,440
Impairment of goodwill | 0 |  | 294 |
TOTAL OPERATING EXPENSES | 2,358 | 777 | 4,830 | 1,440
OPERATING LOSS | (2,183) | (801) | (4,631) | (1,398)
OTHER INCOME (EXPENSE): |  |  |  |
Interest expense, net | (48) | (220) | (56) | (382)
Warrant revaluation | 323 | (3) | 584 | (3)
Derivative revaluation | (1) |  | (1) |
Gain on settlement liability, net | 6 |  | 147 |
Loss on extinguisment of debt |  | (53) |  | (53)
Loss on issuance of convertible notes | (928) |  | (928) |
Merger advisory fees |  | (2,603) |  | (2,603)
Loss on settlement of equity instrument |  |  | (385) |
Total other nonoperating income (expense) | (648) | (2,879) | (639) | (3,041)
LOSS BEFORE INCOME TAXES | (2,831) | (3,680) | (5,270) | (4,439)
INCOME TAX EXPENSE | 0 | 0 | 0 | 0
NET LOSS | (2,831) | (3,680) | (5,270) | (4,439)
Deemed dividends related to beneficial conversion feature of preferred stock and fair value of consideration issued to induce conversion of preferred stock | (334) | (5,248) | (3,848) | (5,248)
TOTAL DIVIDENDS | (334) | (5,248) | (3,848) | (5,248)
NET LOSS AVAILABLE TO COMMON STOCKHOLDERS | $ (3,165) | $ (8,928) | $ (9,118) | $ (9,687)
BASIC AND DILUTED LOSS PER COMMON SHARE (IN DOLLARS PER SHARE) | $ (0.15) | $ (15.35) | $ (0.55) | $ (18.77)
BASIC AND DILUTED WEIGHTED-AVERAGE SHARES OF COMMON STOCK OUTSTANDING (IN SHARES) | 20,737,789 | 581,481 | 16,679,459 | 515,968

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