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Condensed Consolidated Statements of Operations - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Revenues:        
Revenue from collaborative arrangements and other contracts $ 0 $ 388,446 $ 100,762 $ 729,359
Operating expenses:        
Research and development 18,733,584 15,503,032 62,734,891 69,423,513
General and administrative 8,613,895 9,925,055 29,395,232 37,338,763
Impairment of goodwill 0 10,513,371 0 10,513,371
Total operating expenses 27,347,479 35,941,458 92,130,123 117,275,647
Loss from operations (27,347,479) (35,553,012) (92,029,361) (116,546,288)
Other income (expense):        
Interest income 1,106,758 1,938,745 3,914,406 6,314,149
Interest expense 0 (313,488) (177,833) (940,464)
Gain (loss) on investment in affiliated entity 324,251 214,374 (136,061) 987,758
Net unrealized gain (loss) on available-for-sale equity securities 1,330,811 (219,337) 1,810,868 3,921,819
Other (expense) income, net (579,819) 2,854 (1,254,466) (3,850,688)
Net loss $ (25,165,478) $ (33,929,864) $ (87,872,447) $ (110,113,714)
Net loss per share        
Basic (in dollars per share) [1] $ (0.89) $ (1.52) $ (3.35) $ (5.01)
Diluted (in dollars per share) [1] $ (0.89) $ (1.52) $ (3.35) $ (5.01)
Weighted average number of common shares used to compute net loss per share        
Basic (in shares) [1] 28,140,497 22,385,229 26,216,983 21,986,840
Diluted (in shares) [1] 28,140,497 22,385,229 26,216,983 21,986,840
[1] Share and per share amounts have been restated to reflect the 1-for-12 reverse stock split effected in January 2024 on a retroactive basis for all periods presented.