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Summary of Significant Accounting Policies - Schedule of significant segment expenses (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Segment Reporting Information [Line Items]    
General and administrative expense $ 4,433 $ 3,459
Total operating expenses 17,964 10,869
Loss from operations (17,964) (10,869)
Other income, net 1,409 574
Change in fair value of warrant liabilities and fair value of financial instruments issued in excess of proceeds 10,060 (13,336)
Net loss (6,495) (23,631)
Operating Segments [Member]    
Segment Reporting Information [Line Items]    
Tegoprubart - kidney transplantation programs 8,531 4,497
Tegoprubart - other development programs (168) 72
Manufacturing 1,670 777
Personnel-related 3,448 2,526
Stock-based compensation 2,864 1,694
Other operating expenses 1,619 1,303
Total operating expenses 17,964 10,869
Loss from operations (17,964) (10,869)
Other income, net 1,409 574
Change in fair value of warrant liabilities and fair value of financial instruments issued in excess of proceeds 10,060 (13,336)
Net loss $ (6,495) $ (23,631)