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Significant Balance Sheet Components - Schedule of Property and Equipment, Net (Details) - USD ($)
$ in Thousands
Jun. 30, 2025
Dec. 31, 2024
Dec. 31, 2023
Property, Plant and Equipment [Line Items]      
Property and equipment, gross   $ 23
Less accumulated depreciation   (2)
Total property and equipment, net $ 32 21
Equipment [Member]      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross   $ 23