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Consolidated Statements of Operations and Comprehensive Loss - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Cost of goods sold |  | $ (172) |  | $ (233) |  | $ (440) |  | $ (600) |  | $ (1,009) | $ (701)
Gross profit |  | 208 |  | 591 |  | 623 |  | 1,784 |  | 2,398 | 2,014
Operating expenses: |  |  |  |  |  |  |  |  |  |  |
Selling, general and administrative expenses |  | 4,002 |  | 2,279 |  | 9,204 |  | 7,286 |  | 9,819 | 9,684
Research and development expenses |  | 1,778 |  | 4,106 |  | 6,789 |  | 13,886 |  | 19,650 | 10,495
Total operating expenses |  | 5,780 |  | 6,385 |  | 15,993 |  | 21,172 |  | 29,469 | 20,179
Operating loss |  | (5,572) |  | (5,794) |  | (15,370) |  | (19,388) |  | (27,071) | (18,165)
Change in fair value of the warrant liability, net |  | 434 |  | 1,198 |  | 451 |  | 18,407 |  | 19,706 | 15,103
Gain on warrant extinguishment |  |  |  |  |  | 0 |  | (1,123) |  | 0 | 9,613
Loss on debt extinguishment |  |  |  | (1,123) |  |  |  | (1,123) |  | (1,123) | (29,924)
Loss on issuance of financial instrument |  | (1,714) |  |  |  | (1,721) |  | (2,826) |  | (2,826) | 0
Interest expense |  | (671) |  | (3,151) |  | (4,735) |  | (3,402) |  | (7,959) | (21,703)
Other income (expense) |  | 4 |  | (10) |  | 4 |  | (21) |  | 51 | (41)
Net (loss) income |  | (7,519) |  | (8,880) |  | (21,371) |  | (8,353) |  | (19,222) | (45,117)
Other comprehensive (loss) income: |  |  |  |  |  |  |  |  |  |  |
Foreign currency translation adjustments |  | 89 |  | 105 |  | 39 |  | 63 |  | 8 | 83
Total other comprehensive (loss) income |  | $ (7,430) |  | $ (8,775) |  | $ (21,332) |  | $ (8,290) |  | $ (19,214) | $ (45,034)
Common share data: |  |  |  |  |  |  |  |  |  |  |
Basic (loss) income per common share |  | $ (287.00) | [1] | $ (175.00) | [1] | $ (924.00) | [1] | $ (420.00) | [1] | $ (504.00) | $ (2,275,000)
Diluted loss per common share |  | $ (987.00) | [1] | $ (175.00) | [1] | $ (1,715.00) | [1] | $ (448.00) | [1] | $ (504.00) | $ (2,275,000)
Weighted average number of basic shares outstanding |  | 26,112 | [1] | 51,229 | [1] | 23,095 | [1] | 19,841 | [1] | 38,151 | 21
Weighted average number of diluted shares outstanding |  | 26,112 | [1] | 51,229 | [1] | 23,095 | [1] | 19,841 | [1] | 38,151 | 21
Basic and diluted loss per share | [2] |  |  |  |  |  |  |  |  | $ (504.00) | $ (2,275,000)
Weighted average number of basic and diluted shares outstanding | [2] |  |  |  |  |  |  |  |  | 38,151 | 21
Product Revenue [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue |  | $ 216 |  | $ 824 |  | $ 528 |  | $ 2,384 |  | $ 3,378 | $ 2,715
Other Revenue [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue |  | $ 164 |  |  |  | $ 535 |  |  |  | $ 29 |
[1] | reflects a one-for-five hundred (1:500) reverse stock split effected on May 2, 2018 and a one-for-seven hundred (1:700) reverse stock split effected on December 24, 2019.
[2] | reflects a one-for-three hundred and fifty (1:350) reverse stock split effected on November 6, 2017, a one-for-five hundred (1:500) reverse stock split effected on May 2, 2018, and a one-for-seven hundred (1:700) reverse stock split effected on December 24, 2019.

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