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Convertible Notes and Demand Notes - Additional Information (Details) - USD ($)
1 Months Ended 2 Months Ended 3 Months Ended 5 Months Ended 9 Months Ended 12 Months Ended
Nov. 30, 2023
Feb. 28, 2023
Jun. 30, 2024
Nov. 30, 2023
Sep. 30, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 22, 2023
Jul. 01, 2023
Feb. 01, 2023
Convertible Notes and Demand Notes [Line Items]                      
Change in fair value of debt instrument           $ 8,700,000          
Fair value adjustment of warrants           $ 5,701,000 $ 945,000        
Common stock, shares issued (in shares)         106,754,588 48,376,052 17,454,353        
Related Party                      
Convertible Notes and Demand Notes [Line Items]                      
Outstanding advances from related party         $ 2,900,000 $ 0          
BURTECH ACQUISITION CORP [Member]                      
Convertible Notes and Demand Notes [Line Items]                      
Common stock, shares issued (in shares)         87,314,968            
Working Capital Loans Warrant [Member] | BURTECH ACQUISITION CORP [Member]                      
Convertible Notes and Demand Notes [Line Items]                      
Outstanding balance         $ 1,500,000 0          
2023 Note Purchase and Exchange Agreement [Member]                      
Convertible Notes and Demand Notes [Line Items]                      
Grant of restricted stock unit             $ 6,000,000        
Blaize Note Financing Agreement [Member] | RT Parties [Member]                      
Convertible Notes and Demand Notes [Line Items]                      
Amount of investment by separate third party group of investors to the agreement           125,000,000          
Pay-to-Play Convertible Notes [Member]                      
Convertible Notes and Demand Notes [Line Items]                      
Change in fair value of debt instrument           1,300,000 2,600,000        
Fair value adjustment of warrants             61,000,000        
Restoration of common share incremental value $ 5,200,000                    
Pay-to-Play Convertible Notes [Member] | 2022 Note Purchase and Exchange Agreement [Member]                      
Convertible Notes and Demand Notes [Line Items]                      
Proceeds from issuance of debt   $ 9,300,000                  
Debt instrument, maturity date Dec. 09, 2024       Dec. 09, 2024            
Pay-to-Play Convertible Notes [Member] | Exchange Agreement [Member]                      
Convertible Notes and Demand Notes [Line Items]                      
Pro rata basis of consideration               $ 20,000,000      
Proceeds from issuance of warrants $ 100,000                    
2023 Convertible Note [Member]                      
Convertible Notes and Demand Notes [Line Items]                      
Proceeds from issuance of debt       $ 12,300,000   $ 110,700,000          
Exercise price of warrants           $ 11.5          
2023 Convertible Note [Member] | 2023 Note Purchase and Exchange Agreement [Member]                      
Convertible Notes and Demand Notes [Line Items]                      
Debt instrument, interest rate during period       10.00%              
Change in fair value of debt instrument             6,900,000        
Percentage of price of the equity share                   80.00%  
Percentage of conversion price                   80.00%  
Fair value of common stock             2.6        
Restricted stock unit vesting outstanding             $ 6,000,000        
Common stock, shares issued (in shares)             6,000,000        
Debt Instrument Maturity Period       18 months              
2023 Convertible Note [Member] | Restricted Stock Units (RSUs) [Member] | 2023 Note Purchase and Exchange Agreement [Member]                      
Convertible Notes and Demand Notes [Line Items]                      
Grant of restricted stock unit             $ 6,000,000        
Demand Note [Member]                      
Convertible Notes and Demand Notes [Line Items]                      
Issue short term demand notes             5,100,000        
Short term demand note outstanding             $ 4,800,000        
Percentage demand note outstanding             (12.00%)        
Demand notes payable             $ 15,000,000        
Repayments of Notes Payable     $ 5,000,000                
10% secured convertible notes [Member]                      
Convertible Notes and Demand Notes [Line Items]                      
Proceeds from issuance of debt           $ 110,700,000          
Debt instrument, interest rate during period           10.00%          
10% secured convertible notes [Member] | BurTech [Member]                      
Convertible Notes and Demand Notes [Line Items]                      
Proceeds from issuance of debt           $ 11,500,000          
10% secured convertible notes [Member] | Outside Individual Third Parties [Member]                      
Convertible Notes and Demand Notes [Line Items]                      
Proceeds from issuance of debt           2,400,000          
10% secured convertible notes [Member] | RT Parties [Member]                      
Convertible Notes and Demand Notes [Line Items]                      
Proceeds from issuance of debt           $ 96,800,000          
Pay to Play warrants [Member]                      
Convertible Notes and Demand Notes [Line Items]                      
Debt instrument, periodic payment, interest               5,000,000      
Pay to Play warrants [Member] | Maximum [Member]                      
Convertible Notes and Demand Notes [Line Items]                      
Debt instrument, periodic payment, interest               5,000,000      
Pay to Play warrants [Member] | Minimum [Member]                      
Convertible Notes and Demand Notes [Line Items]                      
Debt instrument, periodic payment, interest               $ 1,000,000      
Pay to Play warrants [Member] | 2022 Note Purchase and Exchange Agreement [Member]                      
Convertible Notes and Demand Notes [Line Items]                      
Raising capital of gross proceeds                 $ 5,000,000    
Pay to Play warrants [Member] | Exchange Agreement [Member]                      
Convertible Notes and Demand Notes [Line Items]                      
Proceeds from issuance of warrants $ 100,000                    
Unsecured Convertible Promissory Note [Member] | Working Capital Loans Warrant [Member] | BURTECH ACQUISITION CORP [Member]                      
Convertible Notes and Demand Notes [Line Items]                      
Price per which the outstanding principal amount can be converted                     $ 10
Amount borrowed                     $ 1,500,000