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Consolidated Statements of Operations (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Income Statement [Abstract]        
Revenues $ 1,872 $ 1,069 $ 4,363 $ 4,713
Operating expenses:        
Research and development 5,287 4,026 13,773 12,423
General and administrative 1,685 1,656 5,212 4,837
Goodwill impairment 3,577 3,577
Total operating expenses 6,972 9,259 18,985 20,837
Loss from operations (5,100) (8,190) (14,622) (16,124)
Other income (expense), net:        
Interest income 102 1 118 6
Other (expense) income, net (54) 5 (116) (22)
Total other income (expense), net 48 6 2 (16)
Net loss $ (5,052) $ (8,184) $ (14,620) $ (16,140)
Net loss per share attributable to common stockholders – basic and diluted $ (1.45) $ (2.91) $ (4.32) $ (6.08)
Weighted average common shares outstanding – basic and diluted 3,478,157 2,812,454 3,383,171 2,654,099