Property and Equipment, Net - Schedule of Property, Plant and Equipment, Net (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Property, Plant and Equipment [Abstract]
Pre-production tooling	$ 3,094	$ 3,094
Machinery and equipment	191	191
Leasehold improvements	186	186
Furniture and fixtures	25	25
Exercise equipment	13	13
Property, Plant and Equipment, Gross, Total	3,509	3,509
Less: Accumulated depreciation	(3,443)	(3,393)
Total property and equipment, net	$ 66	$ 116