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CONSOLIDATED CONDENSED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS (UNAUDITED) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Income Statement [Abstract]    
Product revenues $ 703 $ 731
Cost of product revenues (353) (273)
Amortization of intangible assets (306) (306)
Gross profit 44 152
Development revenues:    
Government contracts and other 737 917
Total development revenues 737 917
Operating expenses:    
Research and development 1,846 2,499
Sales and marketing 428 678
General and administrative 1,508 2,244
Total operating expenses 3,782 5,421
Operating loss (3,001) (4,352)
Other income (expense):    
Interest income 7 14
Interest expense (515) (423)
Other income (expense), net 149 352
Change in fair value of warrants 210 0
Total other expense (149) (57)
Net loss $ (3,150) $ (4,409)
Basic and diluted net loss per share attributable to common stockholders $ (0.18) $ (0.73)
Basic and diluted weighted average shares used in calculating net loss per share attributable to common stockholders 17,657,108 6,017,791
Comprehensive loss:    
Net loss $ (3,150) $ (4,409)
Other comprehensive loss – foreign currency translation adjustments (140) (281)
Comprehensive loss $ (3,290) $ (4,690)