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Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Statement [Abstract]              
Revenue $ 858 $ 584 $ 1,560 $ 1,327 $ 2,715 $ 1,992 $ 1,747
Cost of goods sold 220 135 367 354 701 550 462
Gross profit 638 449 1,193 973 2,014 1,442 1,285
Operating expenses:              
Selling, general and administrative expenses 2,641 2,532 5,007 4,947 9,684 9,434 10,009
Research and development expenses 4,089 2,518 9,781 4,840 10,495 8,448 6,486
Total operating expenses 6,730 5,050 14,788 9,787 20,179 17,882 16,495
Operating loss (6,092) (4,601) (13,595) (8,814) (18,165) (16,440) (15,210)
Change in fair value of the warrant liability, net 2,513 (38) 17,209 1,200 15,103 12,780 564
Gain on warrant extinguishment 0 9,613 0 9,613 9,613 0 0
Loss on issuance of financial instrument (2,826) 0 (2,826) 0      
Loss on debt settlements and extinguishments         (29,924) 0 0
Interest expense (248) (6,916) (251) (15,282) (21,703) (14,328) (67)
Other (expense) income (5) (1) (10) 7 (41) 17 9
Net income (loss) (6,658) (1,943) 527 (13,276) (45,117) (17,971) (14,704)
Other comprehensive loss:              
Foreign currency translation adjustments (36) (30) (78) (8) 83 (33) (28)
Comprehensive loss $ (6,694) $ (1,973) $ 449 $ (13,284) $ (45,034) $ (18,004) $ (14,732)
Common share data:              
Basic and diluted loss per common share [1]         $ (3,250) $ (1,853,500) $ (2,548,000)
Basic loss per common share [2] $ (7.26) $ (1,373.00) $ 0.67 $ (15,656.00)      
Diluted loss per common share [2] $ (7.26) $ (1,373.00) $ (0.12) $ (15,656.00)      
Weighted average number of basic shares outstanding [2] 916,706 1,416 788,512 848      
Weighted average number of diluted shares outstanding [2] 916,706 1,416 799,430 848      
Weighted average number of basic and diluted shares outstanding [1]         14,039 10 6
[1] reflects a one-for-sixteen (1:16) reverse stock split effected on July 21, 2016, 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.
[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.