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CONSOLIDATED CONDENSED STATEMENTS OF OPERATIONS AND COMPREHENSIVE (LOSS) INCOME (UNAUDITED) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Income Statement [Abstract]        
Product revenues $ 1,126,000 $ 1,614,000 $ 2,459,000 $ 2,516,000
Cost of product revenues 585,000 1,296,000 1,152,000 1,894,000
Gross profit 541,000 318,000 1,307,000 622,000
Development revenues:        
Government contracts and other 1,699,000 1,847,000 3,284,000 3,291,000
Total development revenues 1,699,000 1,847,000 3,284,000 3,291,000
Operating expenses:        
Research and development 5,247,000 6,048,000 9,374,000 10,012,000
Sales and marketing 889,000 654,000 1,924,000 1,493,000
General and administrative 2,328,000 2,793,000 4,614,000 5,292,000
Change in fair value of warrant liabilities   (13,122,000) 0 2,322,000
Total operating expenses 8,464,000 (3,627,000) 15,912,000 19,119,000
Operating (loss) income (6,224,000) 5,792,000 (11,321,000) (15,206,000)
Other income (expense):        
Income (loss) on asset disposal   (1,000) 2,000 8,000
Loss on debt extinguishment   (260,000) 0 (260,000)
Interest income 2,000 3,000 4,000 3,000
Interest expense (645,000) (936,000) (1,302,000) (2,007,000)
Other income (expense), net 462,000 (148,000) 874,000 (47,000)
Total other expense (181,000) (1,342,000) (422,000) (2,303,000)
Net (loss) income (6,405,000) 4,450,000 (11,743,000) (17,509,000)
Beneficial conversion feature for convertible preferred stock       (661,000)
Net (loss) income allocable to common stockholders $ (6,405,000) $ 4,450,000 $ (11,743,000) $ (18,170,000)
Net income (loss) per share allocable to common stockholders        
Basic $ (0.43) $ 0.48 $ (0.84) $ (2.22)
Diluted $ (0.43) $ 0.45 $ (0.84) $ (2.22)
Weighted average shares used in calculating net income (loss) per share allocable to common stockholders        
Basic 14,778,616 9,266,141 13,932,496 8,179,403
Diluted 14,778,616 9,824,538 13,932,496 8,179,403
Comprehensive (loss) income:        
Net (loss) income $ (6,405,000) $ 4,450,000 $ (11,743,000) $ (17,509,000)
Other comprehensive (loss) income – foreign currency translation adjustments (130,000) 215,000 (379,000) 251,000
Comprehensive (loss) income $ (6,535,000) $ 4,665,000 $ (12,122,000) $ (17,258,000)