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Condensed Consolidated Statements of Operations and Comprehensive Loss (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Income Statement [Abstract]        
Revenue $ 399 $ 217 $ 1,308 $ 778
Cost of goods sold 90 50 360 209
Gross profit 309 167 948 569
Operating expenses:        
Selling, general and administrative 2,276 4,538 7,818 12,956
Research and development 1,683 683 4,112 3,632
Total operating expenses 3,959 5,221 11,930 16,588
Operating loss (3,650) (5,054) (10,982) (16,019)
Change in fair value of the warrant liability, net 1,253 519 1,414 1,612
Other expense and interest expense (25) (23) (43) (29)
Net loss (2,422) (4,558) (9,611) (14,436)
Other comprehensive loss:        
Foreign currency translation adjustments (4) (6) (12) (27)
Comprehensive loss $ (2,426) $ (4,564) $ (9,623) $ (14,463)
Common share data:        
Basic and diluted loss per common share $ (0.12) $ (0.48) $ (0.67) $ (1.54)
Weighted average number of basic and diluted common shares outstanding 19,729,374 9,447,887 14,301,105 9,391,793