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Segment Reporting - Schedule of Operations forReportable Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2025
Sep. 30, 2024
Segment Reporting Information [Line Items]                
Research and development $ 49,700     $ 30,105     $ 142,039 $ 76,094
General and administrative 7,318     9,337     24,110 25,500
Depreciation expense 500     500     1,600 1,600
Stock-based compensation             13,118 14,211
Total operating expenses 57,018     39,442     166,149 101,594
Loss from operations (57,018)     (39,442)     (166,149) (101,594)
Interest and other income, net 2,096     4,618     7,715 11,984
Net loss (54,922) $ (49,156) $ (54,356) (34,824) $ (29,610) $ (25,176) (158,434) (89,610)
Operating Segments [Member]                
Segment Reporting Information [Line Items]                
Other general and administrative expenses 4,795     6,329     15,875 16,275
Depreciation expense 546     538     1,623 1,613
Stock-based compensation 3,835     4,609     13,118 14,211
Total operating expenses 57,018     39,442     166,149 101,594
Loss from operations (57,018)     (39,442)     (166,149) (101,594)
Interest and other income, net 2,096     4,618     7,715 11,984
Net loss (54,922)     (34,824)     (158,434) (89,610)
Operating Segments [Member] | External Expenses [Member]                
Segment Reporting Information [Line Items]                
Research and development 37,733     20,414     103,509 47,783
Operating Segments [Member] | Personnel Expenses [Member]                
Segment Reporting Information [Line Items]                
Research and development 7,916     6,031     25,338 17,134
General and administrative $ 2,193     $ 1,521     $ 6,686 $ 4,578