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Net Loss Per Share - Schedule of computation of basic and dilutive net loss per share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Jun. 30, 2024
Jun. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Dec. 31, 2023
Earnings Per Share [Abstract]                
Net loss $ (26,258) $ (25,607)     $ (203,608) $ (54,503) $ (61,195) $ (87,589)
Weighted-average shares outstanding - basic 103,585,681 17,478,371     100,130,737 17,466,606 17,476,105 4,213,244
Weighted-average shares outstanding - diluted 103,585,681 17,478,371     100,130,737 17,466,606 17,476,105 4,213,244
Net income per share - basic $ (0.25) $ (1.47)     $ (2.03) $ (3.12) $ (3.5) $ (20.79)
Net income per share - diluted $ (0.25) $ (1.47) $ (1.47) $ (3.12) $ (2.03) $ (3.12) (3.5) (20.79)
Net loss per share attributable to common stockholders, Basic             (3.5) (20.79)
Net loss per share attributable to common stockholders, diluted             $ (3.5) $ (20.79)