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Summary of Significant Accounting Policies - Schedule of Significant Segment Expenses (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Segment Reporting Information [Line Items]    
Stock-based compensation expense $ 25,084 $ 16,208
Amortization of intangible assets 267 267
Total research and development expense 205,749 118,021
Operating Segments    
Segment Reporting Information [Line Items]    
Third-party research and development expenses 132,743 69,270
Salaries and other employee-related expenses 37,194 25,163
Stock-based compensation expense 16,380 10,244
Amortization of intangible assets 267 267
Other research and development costs 19,165 13,077
Total research and development expense $ 205,749 $ 118,021