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Condensed Statements of Operations - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Revenue:        
Grant revenue   $ 20   $ 193
Revenue, Product and Service [Extensible List] us-gaap:ResearchAndDevelopmentArrangementContractToPerformForOthersCompensationEarned us-gaap:ResearchAndDevelopmentArrangementContractToPerformForOthersCompensationEarned us-gaap:ResearchAndDevelopmentArrangementContractToPerformForOthersCompensationEarned us-gaap:ResearchAndDevelopmentArrangementContractToPerformForOthersCompensationEarned
Operating expenses:        
Research and development (including related party amounts of $98, $0, $188 and $8, respectively) $ 8,539 $ 1,914 $ 17,441 $ 3,352
General and administrative (including related party amounts of $82, $60, $202 and $232, respectively) 2,798 489 7,263 1,310
Total operating expenses 11,337 2,403 24,704 4,662
Loss from operations (11,337) (2,383) (24,704) (4,469)
Other income, net (including related party expense amounts of $0, $0, $0, and $30, respectively) 19 63 236 44
Net loss $ (11,318) $ (2,320) $ (24,468) $ (4,425)
Net loss per share, basic and diluted $ (0.21) $ (0.09) $ (0.57) $ (0.17)
Weighted-average shares of common stock outstanding, basic and diluted 55,155,030 25,701,737 42,759,656 25,606,779