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Segment Information - Significant expense categories that are regularly reported to the chief operating decision maker (Details) - Reportable Segment [Member] - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Segment Reporting Information [Line Items]      
Revenue $ 76 $ 0 $ 0
Net loss before noncontrolling interest (163,335) (135,447) (148,135)
Clinical Expense      
Segment Reporting Information [Line Items]      
Other Expenses 50,235 42,513 24,963
Cash Compensation      
Segment Reporting Information [Line Items]      
Other Expenses 48,025 31,374 16,409
Cash Operating Expenses      
Segment Reporting Information [Line Items]      
Other Expenses 45,459 49,431 49,360
Other Segment Items      
Segment Reporting Information [Line Items]      
Other Expenses [1] $ 19,692 $ 12,129 $ 57,403
[1] Other segment items primarily include interest income, equity-based compensation, depreciation, and impairment charges.