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BALANCE SHEET COMPONENTS - Schedule of Prepaid Expenses and Other Current Assets (Parenthetical) (Details) - USD ($)
Sep. 30, 2025
Dec. 31, 2024
Dec. 31, 2023
Public Utilities, Inventory [Line Items]      
Other current assets $ 2,090,690 $ 10,269 $ 260
Trumar Capital LLC Acquisition Agreement [Member]      
Public Utilities, Inventory [Line Items]      
Other current assets 1,500,000    
SYME Strategic Investment [Member]      
Public Utilities, Inventory [Line Items]      
Other current assets 400,000    
Executive Chairman and Co-Chief Executive Officer [Member]      
Public Utilities, Inventory [Line Items]      
Other current assets 1,350,000    
Liqueous Settlement Agreement [Member]      
Public Utilities, Inventory [Line Items]      
Other current assets $ 110,000