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Condensed Consolidated Statements of Comprehensive Loss - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Operating expenses:        
Research and development $ 5,103 $ 6,498 $ 9,748 $ 12,087
General and administrative 2,717 2,669 5,097 5,169
Total operating expenses 7,820 9,167 14,845 17,256
Loss from operations (7,820) (9,167) (14,845) (17,256)
Other (expense) income:        
Change in fair value of term loan derivative liability (136) 40 (147) 34
Other expense   (375)   (375)
Interest income, net 195 2 199 5
Interest expense (295) (296) (597) (590)
Total other expense, net (236) (629) (545) (926)
Loss before income taxes (8,056) (9,796) (15,390) (18,182)
Income tax benefit 4 2 9 17
Net loss $ (8,052) $ (9,794) $ (15,381) $ (18,165)
Basic net loss per common share outstanding $ (0.14) $ (0.49) $ (0.34) $ (0.92)
Diluted net loss per common share outstanding $ (0.14) $ (0.49) $ (0.34) $ (0.92)
Weighted average common shares used in net loss per share attributable to common stockholders, basic 59,542,628 20,123,461 45,253,599 19,772,201
Weighted average common shares used in net loss per share attributable to common stockholders, diluted 59,542,628 20,123,461 45,253,599 19,772,201
Net loss $ (8,052) $ (9,794) $ (15,381) $ (18,165)
Other comprehensive loss:        
Net unrealized losses on available-for-sale marketable securities (135)   (135)  
Comprehensive loss $ (8,187) $ (9,794) $ (15,516) $ (18,165)