v3.26.1
Segment Reporting - Schedule of Financial Information Respect to the Company’s Single Operating Segment (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Segment Reporting Information [Line Items]    
Revenue $ 1.6 $ 0.0
Operating expenses    
Depreciation and amortization expense 7.8 4.1
Research and development warrant expense 0.0 0.8
Stock-based compensation expense 70.4 30.1
General and administrative warrant expense 1.1 0.0
Total operating expenses 256.2 144.0
Loss from operations (254.6) (144.0)
Other income (expense), net 20.6 42.0
Interest income, net 16.4 8.7
Loss before income taxes (217.6) (93.3)
Income tax expense (0.1) (0.1)
Net loss (217.7) (93.4)
Reportable Segment    
Segment Reporting Information [Line Items]    
Revenue 1.6 0.0
Operating expenses    
Depreciation and amortization expense 7.8 4.1
Research and development warrant expense 0.0 0.8
Stock-based compensation expense 70.4 30.1
General and administrative warrant expense 1.1 0.0
Other cost of revenue 0.9 0.0
Other research and development expense 133.3 88.2
Other general and administrative expense 42.7 20.8
Total operating expenses 256.2 144.0
Loss from operations (254.6) (144.0)
Other income (expense), net 20.6 42.0
Interest income, net 16.4 8.7
Loss before income taxes (217.6) (93.3)
Income tax expense (0.1) (0.1)
Net loss $ (217.7) $ (93.4)