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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.