v3.25.4
Segment Information - Summary of Segment Performance and Make Decisions About Resource Allocation (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Segment Reporting Information [Line Items]    
Revenues $ 0 $ 251
Operating expenses 89,810 67,533
Other income, net 5,945 1,909
Net loss (83,865) (65,373)
AB-101 (AlloNK) [Member]    
Segment Reporting Information [Line Items]    
Operating expenses 32,379 19,978
Other programs [Member]    
Segment Reporting Information [Line Items]    
Operating expenses 23 330
Personnel-related [Member]    
Segment Reporting Information [Line Items]    
Operating expenses 39,285 30,465
Other [Member]    
Segment Reporting Information [Line Items]    
Operating expenses $ 18,123 $ 16,760