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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Revenue, net of contractual allowances and adjustments |  | $ 917 | $ 796
less allowance for doubtful accounts |  | (204) | (84)
Net sales |  | 713 | 712
Total cost of sales |  | 675 | 688
Gross profit |  | 38 | 24
OPERATING EXPENSES: |  |  |
Operating expenses |  | 2,097 | 2,178
Impairment of goodwill |  |  | 294
TOTAL OPERATING EXPENSES |  | 2,097 | 2,472
OPERATING LOSS |  | (2,059) | (2,448)
OTHER INCOME (EXPENSE): |  |  |
Interest expense, net |  | (23) | (8)
Warrant revaluation and modification |  | 240 | 261
Derivative revaluation |  | 23 |
Gain on settlement of liability, net |  | 167 | 141
Loss on settlement of equity instruments |  |  | (385)
Other Income (Expense) |  | 407 | 9
LOSS BEFORE INCOME TAXES |  | (1,652) | (2,439)
NET LOSS |  | (1,652) | (2,439)
Deemed dividends related to beneficial conversion feature of preferred stock and fair value of consideration issued to induce conversion of preferred stock |  |  | (3,514)
TOTAL DIVIDENDS |  |  | (3,514)
NET LOSS AVAILABLE TO COMMON STOCKHOLDERS |  | $ (1,652) | $ (5,953)
BASIC AND DILUTED LOSS PER COMMON SHARE (IN DOLLARS PER SHARE) | [1] | $ (0.48) | $ (7.10)
BASIC AND DILUTED WEIGHTED-AVERAGE SHARES OF COMMON STOCK OUTSTANDING (IN SHARES) | [1] | 3,441,893 | 838,402
Service revenue, net [Member] |  |  |
Revenue, net of contractual allowances and adjustments |  | $ 910 | $ 791
Total cost of sales |  | 675 | 688
Other [Member] |  |  |
Revenue, net of contractual allowances and adjustments |  | $ 7 | $ 5
[1] | Net loss per share and the number of shares used in the per share calculations for all periods presented reflect the one-for fifteen reverse stock split which took effect on April 26, 2019.

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