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CONSOLIDATED CONDENSED STATEMENTS OF OPERATIONS AND COMPREHENSIVE (LOSS) INCOME (UNAUDITED) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Income Statement [Abstract]        
Product revenues $ 731,000 $ 766,000 $ 3,190,000 $ 3,281,000
Cost of product revenues 618,000 502,000 1,770,000 2,395,000
Gross profit 113,000 264,000 1,420,000 886,000
Development revenues:        
Government contracts and other 1,879,000 1,711,000 5,163,000 5,002,000
Total development revenues 1,879,000 1,711,000 5,163,000 5,002,000
Operating expenses:        
Research and development 3,960,000 4,352,000 13,334,000 14,363,000
Sales and marketing 818,000 566,000 2,742,000 2,059,000
General and administrative 2,011,000 2,370,000 6,625,000 7,662,000
Change in fair value of warrant liabilities   (7,310,000) 0 (4,988,000)
Total operating expenses 6,789,000 (22,000) 22,701,000 19,096,000
Operating (loss) income (4,797,000) 1,997,000 (16,118,000) (13,208,000)
Other income (expense):        
Income (loss) on asset disposal   (3,000) 2,000 6,000
Loss on debt extinguishment     0 (260,000)
Interest income 4,000 3,000 8,000 6,000
Interest expense (645,000) (669,000) (1,947,000) (2,677,000)
Other income, net 54,000 199,000 928,000 152,000
Total other expense (587,000) (470,000) (1,009,000) (2,773,000)
Net (loss) income (5,384,000) 1,527,000 (17,127,000) (15,981,000)
Beneficial conversion feature for convertible preferred stock       (661,000)
Net (loss) income allocable to common stockholders $ (5,384,000) $ 1,527,000 $ (17,127,000) $ (16,642,000)
Net income (loss) per share allocable to common stockholders        
Basic $ (0.26) $ 0.15 $ (1.06) $ (1.87)
Diluted $ (0.26) $ 0.15 $ (1.06) $ (1.87)
Weighted average shares used in calculating net income (loss) per share allocable to common stockholders        
Basic 20,493,840 10,253,231 16,147,042 8,878,276
Diluted 20,493,840 10,531,264 16,147,042 8,878,276
Comprehensive (loss) income:        
Net (loss) income $ (5,384,000) $ 1,527,000 $ (17,127,000) $ (15,981,000)
Other comprehensive (loss) income – foreign currency translation adjustments 58,000 110,000 (321,000) 361,000
Comprehensive (loss) income $ (5,326,000) $ 1,637,000 $ (17,448,000) $ (15,620,000)