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Unaudited Consolidated Statements of Operations and Comprehensive Loss - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Statement of Comprehensive Income [Abstract]        
Collaboration revenues $ 0 $ 9,197 $ 3,729 $ 12,594
Operating expenses:        
Research and development 2,424 15,307 11,580 32,769
General and administrative 3,354 5,560 7,261 11,005
Total operating expenses 5,778 20,867 18,841 43,774
Operating loss (5,778) (11,670) (15,112) (31,180)
Loss on sale of held for sale assets (3,539) 0 (3,539) 0
Loss on abandonment of operating lease right-of-use asset (927) 0 (927) 0
Other income, net 470 508 538 1,040
Pre-tax loss (9,774) (11,162) (19,040) (30,140)
Income tax expense 0 0 0 0
Net loss $ (9,774) $ (11,162) $ (19,040) $ (30,140)
Share information:        
Net loss per share of common stock, basic (in USD per share) $ (0.23) $ (0.27) $ (0.46) $ (0.73)
Net loss per share of common stock, diluted (in USD per share) $ (0.23) $ (0.27) $ (0.46) $ (0.73)
Weighted-average shares of common stock outstanding, basic (in shares) 41,788,096 41,543,553 41,779,701 41,241,009
Weighted-average shares of common stock outstanding, diluted (in shares) 41,788,096 41,543,553 41,779,701 41,241,009