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Consolidated Statements of Operations and Comprehensive Loss - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Cost of goods sold $ (172) $ (220) $ (268) $ (367) $ (1,009) $ (701)
Gross profit 240 638 414 1,193 2,398 2,014
Operating expenses:            
Selling, general and administrative expenses 2,653 2,641 5,203 5,007 9,819 9,684
Research and development expenses 1,714 4,089 5,011 9,781 19,650 10,495
Total operating expenses 4,367 6,730 10,214 14,788 29,469 20,179
Operating loss (4,127) (6,092) (9,800) (13,595) (27,071) (18,165)
Change in fair value of the warrant liability, net 10 2,513 17 17,209 19,706 15,103
Gain on warrant extinguishment         0 9,613
Loss on debt extinguishment         (1,123) (29,924)
Loss on issuance of financial instrument (6) (2,826) (6) (2,826) (2,826) 0
Interest expense (1,837) (248) (4,064) (251) (7,959) (21,703)
Other income (expense) 1 (5)   (10) 51 (41)
Net (loss) income (5,959) (6,658) (13,853) 527 (19,222) (45,117)
Other comprehensive (loss) income:            
Foreign currency translation adjustments (23) (36) (74) (78) 8 83
Other comprehensive (loss) income $ (5,982) $ (6,694) $ (13,927) $ 449 $ (19,214) $ (45,034)
Common share data:            
Basic (loss) income per common share $ (0.08) [1] $ (7.26) [1] $ (0.19) [1] $ 0.67 [1] $ (0.72) $ (3,250)
Diluted loss per common share $ (0.08) [1] $ (7.26) [1] $ (0.19) [1] $ (0.12) [1] $ (0.72) $ (3,250)
Weighted average number of basic shares outstanding 71,303,364 [1] 916,706 [1] 72,069,390 [1] 788,512 [1] 26,705,375 14,039
Weighted average number of diluted shares outstanding 71,303,364 [1] 916,706 [1] 72,069,390 [1] 799,430 [1] 26,705,375 14,039
Basic and diluted loss per share [2]         $ (0.72) $ (3,250)
Weighted average number of basic and diluted shares outstanding 71,303,364   72,069,390   26,705,375 [2] 14,039 [2]
Product Revenue [Member]            
Revenue $ 221 $ 858 $ 311 $ 1,560 $ 3,378 $ 2,715
Other Revenue [Member]            
Revenue $ 191   $ 371   $ 29  
[1] reflects a one-for-five hundred (1:500) reverse stock split effected on May 2, 2018.
[2] reflects a one-for-three hundred and fifty (1:350) reverse stock split effected on November 6, 2017 and a one-for-five hundred (1:500) reverse stock split effected on May 2, 2018.