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Condensed Consolidated Statements of Operations and Comprehensive Loss (Unaudited) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Income Statement [Abstract]        
Revenue $ 584,000 $ 511,000 $ 1,327,000 $ 880,000
Cost of goods sold 135,000 150,000 354,000 261,000
Gross profit 449,000 361,000 973,000 619,000
Operating expenses:        
Selling, general and administrative 2,532,000 2,287,000 4,947,000 4,663,000
Research and development 2,518,000 1,945,000 4,840,000 3,289,000
Total operating expenses 5,050,000 4,232,000 9,787,000 7,952,000
Operating loss (4,601,000) (3,871,000) (8,814,000) (7,333,000)
Change in fair value of the warrant liability, net (38,000) (1,181,000) 1,200,000 491,000
Gain on warrant extinguishment 9,613,000 0 9,613,000 0
Interest expense (6,916,000) (1,614,000) (15,282,000) (1,631,000)
Other income (expense) (1,000) (1,000) 7,000 (7,000)
Net loss (1,943,000) (6,667,000) (13,276,000) (8,480,000)
Other comprehensive loss:        
Foreign currency translation adjustments (30,000) (1,000) (8,000) (10,000)
Comprehensive loss $ (1,973,000) $ (6,668,000) $ (13,284,000) $ (8,490,000)
Common share data:        
Basic loss per share [1] $ (0.01) $ (4.41) $ (0.09) $ (5.72)
Diluted loss per share [1] $ (0.01) $ (4.41) $ (0.09) $ (5.72)
Weighted average number of basic common shares outstanding [1] 252,264,959 1,510,752 148,674,658 1,483,148
Weighted average number of diluted common shares outstanding [1] 252,264,959 1,510,752 148,722,094 1,483,148
[1] reflects a one-for-sixteen (1:16) reverse stock split effected on July 21, 2016