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CONSOLIDATED CONDENSED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS (UNAUDITED) - USD ($)
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
CONSOLIDATED CONDENSED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS (UNAUDITED) [Abstract]    
Product revenues $ 1,333,000 $ 902,000
Cost of product revenues 567,000 598,000
Gross profit 766,000 304,000
Development revenues:    
Government contracts and other 1,585,000 1,444,000
Operating expenses:    
Research and development 4,127,000 3,963,000
Sales and marketing 1,035,000 839,000
General and administrative 2,286,000 2,499,000
Change in fair value of warrants 0 15,444,000
Total operating expenses 7,448,000 22,745,000
Operating loss (5,097,000) (20,997,000)
Other income (expense):    
Interest income 2,000 1,000
Interest expense (657,000) (1,072,000)
Other income, net 413,000 110,000
Total other expense (242,000) (961,000)
Net loss (5,339,000) (21,958,000)
Beneficial conversion feature for convertible preferred stock 0 (661,000)
Net loss allocable to common stock holders $ (5,339,000) $ (22,619,000)
Basic and diluted net loss per share allocable to common stockholders (in dollars per share) $ (0.41) $ (3.19)
Basic and diluted weighted average shares used in calculating net loss per share allocable to common stockholders (in shares) 13,086,376 7,080,590
Comprehensive loss:    
Net loss $ (5,339,000) $ (21,958,000)
Other comprehensive (loss) income - foreign currency translation adjustments (249,000) 36,000
Comprehensive loss $ (5,588,000) $ (21,922,000)