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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Revenue, net of contractual allowances and adjustments | $ 4,095 | $ 3,448
less allowance for doubtful accounts | (968) | (584)
Net sales | 3,127 | 2,864
Total cost of sales | 2,908 | 2,639
Gross profit | 219 | 225
OPERATING EXPENSES: |  |
Operating expenses | 9,623 | 9,452
Impairment of intangible assets and goodwill | 1,590 | 4,685
TOTAL OPERATING EXPENSES | 11,213 | 14,137
OPERATING LOSS | (10,994) | (13,912)
OTHER INCOME (EXPENSE): |  |
Interest expense, net | (473) | (269)
Warrant revaluation | 416 | 1,918
Loss on modification of warrants | (1,128) |
Derivative revaluation | (415) | 267
Gain on settlement of liability, net | 1,437 | 263
(Loss) gain on extinguishment of debt | (20) | 376
Loss on extinguishment of convertible notes |  | (2,903)
Loss on litigation | (266) |
Loss on issuance of convertible notes | (1,870) | (1,328)
Loss on settlement of equity instruments |  | (385)
Total other expenses | (2,319) | (2,061)
LOSS BEFORE INCOME TAXES | (13,313) | (15,973)
INCOME TAX BENEFIT | 70 | 279
NET LOSS | (13,243) | (15,694)
Deemed dividends related to beneficial conversion feature of preferred stock and fair value of consideration issued to induce conversion of preferred stock |  | (4,222)
TOTAL DIVIDENDS |  | (4,222)
NET LOSS AVAILABLE TO COMMON STOCKHOLDERS | $ (13,243) | $ (19,916)
BASIC AND DILUTED LOSS PER COMMON SHARE (IN DOLLARS PER SHARE) | $ (2.33) | $ (13.82)
BASIC AND DILUTED WEIGHTED-AVERAGE SHARES OF COMMON STOCK OUTSTANDING (IN SHARES) | 5,695,159 | 1,441,113
Service revenue, net [Member] |  |
Revenue, net of contractual allowances and adjustments | $ 4,051 | $ 3,335
less allowance for doubtful accounts | (968) | (584)
Net sales | 3,083 | 2,751
Total cost of sales | 2,908 | 2,549
Clinical research grants [Member] |  |
Revenue, net of contractual allowances and adjustments |  | 100
Total cost of sales |  | 90
Other [Member] |  |
Revenue, net of contractual allowances and adjustments | $ 44 | $ 13

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