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Condensed Consolidated Statements of Operations and Comprehensive Loss (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Income Statement [Abstract]        
Revenue $ 435 $ 399 $ 1,316 $ 1,308
Cost of goods sold 112 90 373 360
Gross profit 323 309 943 948
Operating expenses:        
Selling, general and administrative 2,361 2,276 7,025 7,818
Research and development 2,686 1,683 5,975 4,112
Total operating expenses 5,047 3,959 13,000 11,930
Operating loss (4,724) (3,650) (12,057) (10,982)
Change in fair value of the warrant liability, net 8,680 1,253 9,171 1,414
Interest income (expense) (4,963) (14) (6,584) (39)
Other income (expense) 2 (11) (15) (4)
Net loss (1,005) (2,422) (9,485) (9,611)
Other comprehensive income (loss):        
Foreign currency translation adjustments (2) (4) (12) (12)
Comprehensive loss $ (1,007) $ (2,426) $ (9,497) $ (9,623)
Common share data:        
Basic and diluted loss per common share [1] $ (0.66) $ (1.96) $ (6.38) $ (10.75)
Weighted average number of basic and diluted common shares outstanding [1] 1,521,927 1,233,086 1,486,986 893,819
[1] reflects a one-for-sixteen (1:16) reverse stock split effected on July 21, 2016