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CONSOLIDATED CONDENSED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Development revenues:    
Government contracts and other   $ 118
Operating expenses:    
Research and development $ 1,127 941
General and administrative 1,352 1,618
Total operating expenses 2,479 2,559
Loss from operations (2,479) (2,441)
Other income (expense):    
Interest income 4 36
Interest expense (247) (349)
Change in fair value of warrants 2 1,667
Total other income (expense) (241) 1,354
Net loss $ (2,720) $ (1,087)
Net loss per share, basic and diluted $ (0.33) $ (0.28)
Basic and diluted weighted average shares used in calculating net loss per share attributable to common stockholders 8,267,901 3,880,588