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Condensed Consolidated Statements of Operations and Comprehensive Loss (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Cost of goods sold $ (96) $ (147)
Gross profit 174 555
Operating expenses:    
Selling, general and administrative 2,549 2,366
Research and development 3,298 5,692
Total operating expenses 5,847 8,058
Operating loss (5,673) (7,503)
Change in fair value of the warrant liability, net 7 14,697
Interest expense (2,229) (2)
Other income (expense) 2 (5)
Net (loss) income (7,893) 7,187
Other comprehensive (loss) income:    
Foreign currency translation adjustments 57 (34)
Comprehensive (loss) income $ (7,836) $ 7,153
Common share data:    
Basic (loss) income per common share [1] $ (0.11) $ 10.91
Diluted (loss) income per common share [1] $ (0.11) $ 10.91
Weighted average number of basic shares outstanding [1] 73,558,713 658,893
Weighted average number of diluted shares outstanding [1] 73,558,713 658,893
Product Revenue [Member]    
Revenue $ 90 $ 702
Other Revenue [Member]    
Revenue $ 180  
[1] reflects a one-for-five hundred (1:500) reverse stock split effected on May 2, 2018.