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Unaudited Consolidated Statements of Operations and Comprehensive Loss - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Statement of Comprehensive Income [Abstract]        
Collaboration revenues $ 9,197 $ 3,560 $ 12,594 $ 6,803
Operating expenses:        
Research and development 15,307 18,518 32,769 35,159
General and administrative 5,560 6,007 11,005 15,581
Total operating expenses 20,867 24,525 43,774 50,740
Operating loss (11,670) (20,965) (31,180) (43,937)
Change in fair value of derivative liability 0 0 0 (84)
Interest income (expense), net 508 1,177 1,040 (300)
Pre-tax loss (11,162) (19,788) (30,140) (44,321)
Income tax expense 0 (88) 0 (197)
Net loss $ (11,162) $ (19,876) $ (30,140) $ (44,518)
Share information:        
Net loss per share of common stock, basic (in USD per share) $ (0.27) $ (0.49) $ (0.73) $ (1.67)
Net loss per share of common stock, diluted (in USD per share) $ (0.27) $ (0.49) $ (0.73) $ (1.67)
Weighted-average shares of common stock outstanding, basic (in shares) 41,543,553 40,258,107 41,241,009 26,596,712
Weighted-average shares of common stock outstanding, diluted (in shares) 41,543,553 40,258,107 41,241,009 26,596,712
Comprehensive loss        
Net loss $ (11,162) $ (19,876) $ (30,140) $ (44,518)
Unrealized gain on marketable securities 0 129 0 306
Comprehensive loss $ (11,162) $ (19,747) $ (30,140) $ (44,212)