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Income Taxes - Schedule of Reconciliation of the Income Tax Determined By Applying the U.S. Federal Statutory Income Tax Rate to Pretax Loss (Details) - USD ($)
$ 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
Effective Income Tax Rate Reconciliation [Line Items]            
Pretax loss $ (26,237) $ (25,552) $ (203,386) $ (54,155) $ (62,147) $ (88,187)
Federal tax at statutory rate         (13,049) (18,522)
State taxes, net of federal benefit         1 1
Gain on remeasurement of warrant liability         3,302 0
Pay-to-Play equity financing charge (permanent difference)         0 7,525
Other permanent differences         802 3,620
Return to accrual adjustment         (896) (433)
Foreign tax rate differential         195 111
Tax credits         (1,211) (539)
Uncertain tax positions         410 270
Valuation allowance         10,290 7,936
Other, net         (796) (567)
Income tax expense $ 21 $ 55 $ 222 $ 348 $ (952) $ (598)
Federal tax at statutory rate (in percent) 21.00% 21.00% 21.00% 21.00% 21.00% 21.00%
State taxes, net of federal benefit (in percent)         0.00% 0.00%
Gain on remeasurement of warrant liability (in percent)         (5.30%) 0.00%
Pay-to-Play equity financing charge (permanent difference) (in percent)         0.00% (8.50%)
Other permanent differences (in percent)         (1.30%) (4.10%)
Return to accrual adjustment (in percent)         1.40% 0.50%
Foreign tax rate differential (in percent)         (0.30%) (0.10%)
Tax credits (in percent)         1.90% 0.60%
Uncertain tax positions (in percent)         (0.70%) (0.30%)
Valuation allowance (in percent)         (16.60%) (9.00%)
Other, net (in percent)         1.30% 0.60%
Effective income tax rate (in percent) (0.10%) (0.20%) (0.10%) (0.60%) 1.40% 0.70%