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Condensed Consolidated Statements of Operations and Comprehensive Loss (Unaudited) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Income Statement [Abstract]        
Revenue $ 684,000 $ 435,000 $ 2,011,000 $ 1,316,000
Cost of goods sold 172,000 112,000 527,000 373,000
Gross profit 512,000 323,000 1,484,000 943,000
Operating expenses:        
Selling, general and administrative 2,860,000 2,361,000 7,807,000 7,025,000
Research and development 2,279,000 2,686,000 7,119,000 5,975,000
Total operating expenses 5,139,000 5,047,000 14,926,000 13,000,000
Operating loss (4,627,000) (4,724,000) (13,442,000) (12,057,000)
Change in fair value of the warrant liability, net 27,000 8,680,000 1,227,000 9,171,000
Gain on warrant extinguishment 0 0 9,613,000 0
Loss on debt settlements (2,952,000)   (2,952,000) 0
Interest expense (5,042,000) (4,963,000) (20,324,000) (6,584,000)
Other income (expense) (2,000) 3,000 5,000 (15,000)
Net loss (12,596,000) (1,004,000) (25,873,000) (9,485,000)
Other comprehensive loss:        
Foreign currency translation adjustments (15,000) (2,000) 7,000 (12,000)
Comprehensive loss $ (12,611,000) $ (1,006,000) $ (25,866,000) $ (9,497,000)
Common share data:        
Basic and diluted loss per share [1] $ (9.36) $ (230.99) $ (34.99) $ (2,232.30)
Weighted average number of basic and diluted common shares outstanding [1] 1,401,413 4,349 754,421 4,249
[1] reflects a one-for-sixteen (1:16) reverse stock split effected on July 21, 2016 and a one-for-three hundred and fifty (1:350) reverse stock split effected on November 6, 2017