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Condensed Consolidated Statements of Operations and Comprehensive Loss (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Income Statement [Abstract]        
Revenue $ 824 $ 684 $ 2,384 $ 2,011
Cost of goods sold 233 172 600 527
Gross profit 591 512 1,784 1,484
Operating expenses:        
Selling, general and administrative 2,279 2,860 7,286 7,807
Research and development 4,106 2,279 13,886 7,119
Total operating expenses 6,385 5,139 21,172 14,926
Operating loss (5,794) (4,627) (19,388) (13,442)
Change in fair value of the warrant liability, net 1,198 27 18,407 1,227
Gain on warrant extinguishment 0 0 0 9,613
Loss on debt extinguishment (1,123) (2,952) (1,123) (2,952)
Loss on issuance of financial instrument 0 0 (2,826) 0
Interest expense (3,151) (5,042) (3,402) (20,324)
Other (expense) income (10) (2) (21) 5
Net loss (8,880) (12,596) (8,353) (25,873)
Other comprehensive loss:        
Foreign currency translation adjustments 105 (15) 63 7
Comprehensive loss $ (8,775) $ (12,611) $ (8,290) $ (25,866)
Common share data:        
Basic loss per common share [1] $ (0.25) $ (4,565) $ (0.60) $ (17,313)
Diluted loss per common share [1] $ (0.25) $ (4,565) $ (0.64) $ (17,313)
Weighted average number of basic shares outstanding [1] 35,859,866 2,763 13,888,577 1,494
Weighted average number of diluted shares outstanding [1] 35,859,866 2,763 13,888,587 1,494
[1] 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.