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Supplementary Balance Sheet Information - Summary of Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | --- | ---
Prepaid Expenses And Other Current Assets [Line Items] |  |  |
Total prepaid expenses and other current assets | $ 8,418 | $ 14,837 | $ 2,836
Prepaid Expenses and Other Current Assets [Member] |  |  |
Prepaid Expenses And Other Current Assets [Line Items] |  |  |
Deferred offering costs |  | 11,121 | 1,491
Prepaid taxes |  | 2,020 | 0
Software licenses and maintenance |  | 510 | 311
Advances paid to contract manufacturer |  | 161 | 144
Other receivables |  | 51 | 441
Prepaid subscriptions |  | 131 | 83
Other |  | 843 | 366
Total prepaid expenses and other current assets |  | $ 14,837 | $ 2,836

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