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Segment Reporting - Segment Profit And Loss (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Segment Reporting    
Research and development $ 77,106 $ 42,127
General and administrative 34,452 25,704
Stock-based compensation expense 13,042 6,314
Acquired in-process research and development   15,199
Other income, net 17,298 10,139
Net Loss (94,260) (72,891)
Single reportable segment    
Segment Reporting    
Stock-based compensation expense 12,907 6,313
Consulting and professional services expenses 17,952 9,382
Other segment expenses 5,790 7,810
Acquired in-process research and development   15,199
Other income, net (17,298) (10,139)
Net Loss 94,260 72,891
Single reportable segment | Navenibart    
Segment Reporting    
Research and development 32,401 24,186
Single reportable segment | STAR-0310    
Segment Reporting    
Research and development 15,497 677
Single reportable segment | Employee expenses    
Segment Reporting    
Research and development 14,415 9,859
General and administrative 11,575 9,128
Single reportable segment | Program support    
Segment Reporting    
General and administrative $ 1,021 $ 476