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Unaudited Consolidated Statements of Operations and Comprehensive Loss - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Statement of Comprehensive Income [Abstract]        
Collaboration revenues $ 3,385 $ 3,827 $ 15,979 $ 10,630
Operating expenses:        
Research and development 11,326 19,551 44,095 54,710
General and administrative 5,203 6,620 16,208 22,201
Total operating expenses 16,529 26,171 60,303 76,911
Operating loss (13,144) (22,344) (44,324) (66,281)
Change in fair value of derivative liability 0 0 0 (84)
Interest income, net 442 941 1,482 641
Pre-tax loss (12,702) (21,403) (42,842) (65,724)
Income tax expense 0 0 0 (197)
Net loss $ (12,702) $ (21,403) $ (42,842) $ (65,921)
Share information:        
Net loss per share of common stock, basic (in USD per share) $ (0.31) $ (0.53) $ (1.04) $ (2.11)
Net loss per share of common stock, diluted (in USD per share) $ (0.31) $ (0.53) $ (1.04) $ (2.11)
Weighted-average shares of common stock outstanding, basic (in shares) 41,588,035,000 40,285,858 41,357,528 31,209,904
Weighted-average shares of common stock outstanding, diluted (in shares) 41,588,035,000 40,285,858 41,357,528 31,209,904
Comprehensive loss        
Net loss $ (12,702) $ (21,403) $ (42,842) $ (65,921)
Unrealized gain on marketable securities 0 108 0 414
Comprehensive loss $ (12,702) $ (21,295) $ (42,842) $ (65,507)