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Stock-based Compensation - Schedule of stock-based compensation recorded in the Company's statements of operations and comprehensive loss (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024 | Dec. 31, 2023
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |
Share - Based Compensation | $ 5,245 | $ 1,718 | $ 10,136 | $ 3,989 | $ 5,550 | $ 5,399
Research and development [Member] |  |  |  |  |  |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |
Share - Based Compensation | 2,228 | 1,029 | 5,148 | 2,518 | 3,482 | 3,270
General and administrative [Member] |  |  |  |  |  |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |
Share - Based Compensation | 2,475 | 421 | 3,952 | 988 | 1,405 | 1,658
Selling and Marketing [Member] |  |  |  |  |  |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |
Share - Based Compensation | 390 | 209 | 707 | 338 | 454 | 289
Truck and freight operations [Member] |  |  |  |  |  |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |
Share - Based Compensation | $ 152 | $ 59 | $ 329 | $ 145 | $ 209 | $ 182

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