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Net Loss Per Common Share - Schedule of Earnings Per Share, Basic and Diluted (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Dec. 31, 2023
Net Loss/Income $ (269,935) $ (19,144) $ (511,846) $ (55,107) $ (69,459) $ (56,945)
Weighted average shares outstanding, basic (in shares) 69,405,000 58,398,000 62,978,000 58,338,000 88,181,000 87,459,000
Weighted average shares outstanding, diluted (in shares) 69,405,000 58,398,000 62,978,000 58,338,000 88,181,000 87,459,000
Basic net loss per share (in USD per share) $ (3.89) $ (0.33) $ (8.13) $ (0.94) $ (0.79) $ (0.65)
Diluted net loss per share (in USD per share) $ (3.89) $ (0.33) $ (8.13) $ (0.94) $ (0.79) $ (0.65)
Common stock options         49,157,000 64,357,000
Warrants 39,859,000   39,859,000   1,433  
Dilutive Common Stock Equivalents Outstanding 135,441,000 113,822,000 135,441,000 113,822,000 170,612,000 161,008,000
Redeemable Convertible Preferred Stock [Member]            
Redeemable convertible preferred stock 14,216,000 62,240,000 14,216,000 62,240,000 93,963,000 93,963,000
Common Stock Options [Member]            
Common stock options 55,990,000 49,922,000 55,990,000 49,922,000 74,211,000 64,357,000
Redeemable Convertible Preferred Stock Warrants [Member]            
Warrants 0 1,305,000 0 1,305,000 1,969,000 1,969,000
Common Stock Warrants [Member]            
Warrants 65,235,000 355,000 65,235,000 355,000 469,000 719,000