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Condensed Consolidated Statements of Operations (unaudited) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Revenue:        
Collaboration revenue $ 0 $ 0 $ 0 $ 1,885
Operating expenses:        
Research and development 11,634 12,528 37,897 40,707
General and administrative 4,092 4,596 13,362 14,424
Total operating expenses 15,726 17,124 51,259 55,131
Operating loss (15,726) (17,124) (51,259) (53,246)
Other (expense) income:        
Interest income 697 1,598 2,544 5,364
Interest expense (1,341) (1,244) (3,905) (3,389)
Loss on extinguishment of debt 0 0 0 (553)
Other income, net 0 97 179 1,709
Total other (expense) income (644) 451 (1,182) 3,131
Net loss $ (16,370) $ (16,673) $ (52,441) $ (50,115)
Net loss per common share, basic (in usd per share) $ (0.36) $ (0.38) $ (1.16) $ (1.17)
Net loss per common share, diluted (in usd per share) $ (0.36) $ (0.38) $ (1.16) $ (1.19)
Weighted-average common shares outstanding, basic (in shares) 45,804,042 43,704,836 45,207,894 42,947,282
Weighted-average common shares outstanding, diluted (in shares) 45,804,042 43,704,836 45,207,894 43,386,287