Balance Sheet Components - Schedule of Property and Equipment (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024	Dec. 31, 2023
Schedule of Property and Equipment [Line Items]
Total property and equipment	$ 714	$ 714	$ 720
Less: accumulated depreciation	(585)	(501)	(378)
Total property and equipment, net	129	213	342
Office Equipment and Furniture [Member]
Schedule of Property and Equipment [Line Items]
Total property and equipment	260	260	266
Software [Member]
Schedule of Property and Equipment [Line Items]
Total property and equipment	144	144	144
Test Equipment [Member]
Schedule of Property and Equipment [Line Items]
Total property and equipment	$ 310	$ 310	$ 310

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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