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Income Taxes - Schedule of Company's Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | --- | ---
Deferred tax assets: |  |  |
Net operating loss carryforwards |  | $ 55,739 | $ 45,600
Tax credit |  | 5,678 | 4,989
Other reserves and accrued expenses |  | 1,178 | 1,105
Lease liability |  | 80 | 110
Depreciation |  | 440 | 66
Share-based compensation |  | 1,519 | 736
Capitalized R&D Sec 174 |  | 13,423 | 9,533
Other |  | 3 | (62)
Gross deferred tax assets |  | 78,060 | 62,077
Valuation allowance |  | (75,826) | (60,937)
Net deferred tax assets |  | 2,234 | 1,140
Deferred tax liabilities: |  |  |
Right of use assets |  | (77) | (107)
Total deferred tax liabilities |  | (77) | (107)
Total net deferred tax assets | $ 2,363 | $ 2,157 | $ 1,033

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