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Merger and Reverse Recapitalization - Additional Information (Details)
 3 Months Ended 9 Months Ended
Jan. 13, 2025
USD ($)
$ / shares
shares
Sep. 30, 2025
USD ($)
$ / shares
shares
Sep. 30, 2025
USD ($)
Days
$ / shares
shares
Dec. 31, 2024
shares
Dec. 31, 2023
shares
Business Acquisition [Line Items]          
Warrants outstanding at merger       756,172,000 1,096,730,000
Common stock shares issued   106,754,588 106,754,588 48,376,052 17,454,353
Shares pledged to secure note receivable 2,000,000        
Shareholder note, outstanding principal | $   $ 8,600,000 $ 8,600,000    
Payment of Shareholder note receivable | $   0 $ 200,000    
Cash escrow held for redemption | $ $ 11.57        
Earnout Shares          
Business Acquisition [Line Items]          
Earnout commencement period     Jan. 13, 2025    
Earnout ending period     Jan. 13, 2030    
Number of consecutive trading days | Days     30    
Number of trading days | Days     20    
Fair value of earnout shares | $     $ 82,900,000    
Stock based compensation expense | $   $ 3,800,000 $ 11,400,000    
Shares forfeited during the period   182,180 237,669    
Service period     5 years    
Uunrecognized compensation cost | $   $ 68,600,000 $ 68,600,000    
Put Option          
Business Acquisition [Line Items]          
Redemption value per share | $ / shares $ 13.07        
Common Stock [Member]          
Business Acquisition [Line Items]          
Shares issued for common stock   769,231 873,486    
Common stock shares issued       17,519,999  
Redemption value per share | $ / shares $ 11.57        
Common Stock [Member] | Earnout Shares | Tranche One          
Business Acquisition [Line Items]          
Common stock price per share | $ / shares   $ 12.5 $ 12.5    
Common Stock [Member] | Earnout Shares | Tranche Two          
Business Acquisition [Line Items]          
Common stock price per share | $ / shares   15 15    
Common Stock [Member] | Earnout Shares | Tranche Three          
Business Acquisition [Line Items]          
Common stock price per share | $ / shares   17.5 17.5    
Common Stock [Member] | Earnout Shares | Tranche Four          
Business Acquisition [Line Items]          
Common stock price per share | $ / shares   $ 20 $ 20    
Public Warrants          
Business Acquisition [Line Items]          
Warrants outstanding at merger 28,750,000        
Private Placement Warrants          
Business Acquisition [Line Items]          
Warrants outstanding at merger 898,250        
Non Redemption Agreement Shares          
Business Acquisition [Line Items]          
Guaranteed redemption value per share | $ / shares $ 13.07        
PIPE Subscription Agreements [Member] | Blaize Class A Common Stock          
Business Acquisition [Line Items]          
Shares issued for common stock 1,529,500        
Price per share of PIPE issuance | $ / shares $ 10        
BurTech LP          
Business Acquisition [Line Items]          
Shareholder note receivable, principal amount | $ $ 8,800,000        
Common stock shares issued 750,000        
Interest rate on shareholder note 7.00%        
Sponsor Gurantee          
Business Acquisition [Line Items]          
Incremental redemption guarantee per share | $ / shares $ 1.5        
Sponsor [Member]          
Business Acquisition [Line Items]          
Incremental redemption guarantee per share | $ / shares $ 1.5        
Burkhan [Member] | Earnout Shares | Tranche One          
Business Acquisition [Line Items]          
Issuance of earnout share awards     650,000    
Burkhan [Member] | Earnout Shares | Tranche Two          
Business Acquisition [Line Items]          
Issuance of additional earnout share awards     650,000    
Burkhan [Member] | Earnout Shares | Tranche Three          
Business Acquisition [Line Items]          
Issuance of additional earnout share awards     650,000    
Burkhan [Member] | Earnout Shares | Tranche Four          
Business Acquisition [Line Items]          
Issuance of additional earnout share awards     650,000    
Bur Tech          
Business Acquisition [Line Items]          
Merger exchange ratio 0.78        
Legacy Blaize Shareholders [Member] | Earnout Shares | Tranche One          
Business Acquisition [Line Items]          
Issuance of earnout share awards     3,750,000    
Legacy Blaize Shareholders [Member] | Earnout Shares | Tranche Two          
Business Acquisition [Line Items]          
Issuance of additional earnout share awards     3,750,000    
Legacy Blaize Shareholders [Member] | Earnout Shares | Tranche Three          
Business Acquisition [Line Items]          
Issuance of additional earnout share awards     3,750,000    
Legacy Blaize Shareholders [Member] | Earnout Shares | Tranche Four          
Business Acquisition [Line Items]          
Issuance of additional earnout share awards     3,750,000