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Condensed Consolidated Statements of Operations and Comprehensive Loss (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Income Statement [Abstract]        
Revenue $ 466 $ 251 $ 910 $ 561
Cost of goods sold 137 66 270 160
Gross profit 329 185 640 401
Operating expenses:        
Selling, general and administrative 2,502 4,597 5,542 8,416
Research and development 1,450 1,492 2,430 2,949
Total operating expenses 3,952 6,089 7,972 11,365
Operating loss (3,623) (5,904) (7,332) (10,964)
Change in fair value of the warrant liability, net (48) 1,297 161 1,092
Other income (expense) and interest income (expense) (28) 7 (18) (6)
Net loss (3,699) (4,600) (7,189) (9,878)
Other comprehensive income (loss):        
Foreign currency translation adjustments 7 (20) (7) (22)
Comprehensive loss $ (3,692) $ (4,620) $ (7,196) $ (9,900)
Common share data:        
Basic loss per common share $ (0.30) $ (0.49) $ (0.62) $ (1.06)
Diluted loss per common share $ (0.30) $ (0.52) $ (0.62) $ (1.08)
Weighted average number of basic common shares outstanding 12,241,154 9,426,169 11,552,572 9,363,123
Weighted average number of diluted common shares outstanding 12,241,154 9,480,933 11,552,572 9,462,717