v3.26.3
Segment Reporting - Summary of the Segment Loss including Significant Segment Expenses (Parenthetical) (Details) - Related Party - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Segment Reporting [Line Items]        
AB program research and development costs $ 1,856 $ 20,014 $ 11,282 $ 20,014
Undisclosed programs research and development costs 9,142   15,038  
Research and development personnel costs (including stock-based compensation)   10   46
Parasa warrant stock-based compensation 12,664 199 13,508 199
Other general and administrative costs   721   721
Other research and development costs $ 0 $ 39 $ 21 $ 39