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CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Income Statement [Abstract]    
Product revenues $ 4,656 $ 4,838
Cost of product revenues 2,715 3,186
Gross profit 1,941 1,652
Development revenues:    
Government contracts and other 6,724 6,821
Total development revenues 6,724 6,821
Operating expenses:    
Research and development 16,197 19,000
Sales and marketing 3,611 2,662
General and administrative 8,563 9,765
Change in fair value of warrant liabilities 0 (7,668)
Total operating expenses 28,371 23,759
Operating loss (19,706) (15,286)
Other income (expense):    
Loss on debt extinguishment 0 (260)
Interest income 19 9
Interest expense (2,592) (3,379)
Other income, net 233 172
Total other expense (2,340) (3,458)
Net loss (22,046) (18,744)
Beneficial conversion feature for convertible preferred stock 0 (661)
Net loss allocable to common stockholders $ (22,046) $ (19,405)
Basic and diluted net loss per share allocable to common stockholders $ (1.28) $ (2.07)
Basic and diluted weighted average shares used in calculating net loss per share allocable to common stockholders 17,290,933 9,386,488
Comprehensive loss:    
Net loss $ (22,046) $ (18,744)
Other comprehensive income – foreign currency translation adjustments 262 296
Comprehensive loss $ (21,784) $ (18,448)