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Segment Information - Schedule of Significant Segment Expense Categories (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Segment Reporting Information [Line Items]    
Research and development expense $ 813 $ 2,279
Stock-based compensation expense 1,015 296
Net loss (3,705) (5,566)
Significant Segment Expense Category    
Segment Reporting Information [Line Items]    
General and administrative expense (1,888) (3,457)
Stock-based compensation expense (1,015) (296)
Other Segment Items    
Segment Reporting Information [Line Items]    
Other segment items (180) 423
Key Measure of Segment Profit or Loss    
Segment Reporting Information [Line Items]    
Net loss (3,705) (5,566)
HSCT-TMA (AK901) Program Expense | Significant Segment Expense Category    
Segment Reporting Information [Line Items]    
Research and development expense (62) (633)
ADC Preclinical Development | Significant Segment Expense Category    
Segment Reporting Information [Line Items]    
Research and development expense (17)  
Chemistry, Manufacturing and Control | Significant Segment Expense Category    
Segment Reporting Information [Line Items]    
Research and development expense (28) (711)
Other External Development Expense | Significant Segment Expense Category    
Segment Reporting Information [Line Items]    
Research and development expense (98) (305)
Internal and Other Research and Development Expense | Significant Segment Expense Category    
Segment Reporting Information [Line Items]    
Research and development expense $ (417) $ (587)