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CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Development revenue:    
Government contracts and other   $ 303
Total development revenues   303
Operating expenses:    
Research and development $ 5,323 2,700
In process research and development acquired 250 781
General and administrative 6,853 6,406
Loss on disposal of property and equipment 66 0
Total operating expenses 12,492 9,887
Operating loss (12,492) (9,584)
Other income (expense):    
Interest income 19 50
Interest expense (932) (1,107)
Change in fair value of liability instruments 6 2,400
Total other expense (907) 1,343
Net loss $ (13,399) $ (8,241)
Net loss per share, basic and diluted $ (1.11) $ (1.86)
Basic and diluted weighted average shares used in calculating net loss per share attributable to common stockholders 12,089,186 4,427,835