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Organization and Description of Business - Additional Information (Details) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Jul. 14, 2025
Jan. 13, 2025
Dec. 31, 2023
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Dec. 31, 2023
Subsidiary, Sale of Stock [Line Items]                  
Entity Incorporation, Date of Incorporation     Feb. 16, 2010            
Net loss       $ (26,258,000) $ (25,607,000) $ (203,608,000) $ (54,503,000) $ (61,195,000) $ (87,589,000)
Working Capital Deficit, Net               114,500,000  
Accumulated Deficit     $ (368,056,000) (632,859,000)   (632,859,000)   (429,251,000) (368,056,000)
Cash and Cash Equivalents     $ 3,213,000 $ 24,001,000 $ 68,640,000 $ 24,001,000 $ 68,640,000 $ 50,237,000 $ 3,213,000
Class of Warrant or Right, Outstanding     1,096,730,000         756,172,000 1,096,730,000
Share Price     $ 0.25         $ 0.88 $ 0.25
Common Stock, Par or Stated Value Per Share     $ 0.00001 $ 0.0001   $ 0.0001   $ 0.0001 $ 0.00001
Intangible Assets, Net (Including Goodwill)               $ 0  
Common stock shares issued     17,454,353 106,754,588   106,754,588   48,376,052 17,454,353
Aggregate purchase price       $ 2,238,000   $ 2,538,000      
BURTECH ACQUISITION CORP [Member]                  
Subsidiary, Sale of Stock [Line Items]                  
Common stock shares issued       87,314,968   87,314,968      
Sponsor Notes [Member]                  
Subsidiary, Sale of Stock [Line Items]                  
Notes Issued   $ 8,753,744              
Notes Interest Bearing Interest Rate   7.00%              
Sponsor Notes [Member] | Non-Redemption Agreement [Member]                  
Subsidiary, Sale of Stock [Line Items]                  
Return of Per Share of Non-Redeemed Share               $ 1.5  
B Riley [Member] | Committed Equity Facility [Member]                  
Subsidiary, Sale of Stock [Line Items]                  
Stock Issued During Period, Shares, New Issues           8,410,321      
PIPE Subscription Agreements [Member] | PIPE Investors [Member]                  
Subsidiary, Sale of Stock [Line Items]                  
Stock Issued During Period, Shares, New Issues   1,540,300              
Share Price   $ 10              
Lock Up Agreement [Member] | Merger Agreement [Member]                  
Subsidiary, Sale of Stock [Line Items]                  
Threshold Period After Business Combination In Which Specified Trading Days Within Any Specified Trading Day Period Commences               20 days  
Threshold Consecutive Trading Days For Transfer Assign Or Sale Of Shares Or Warrants After Completion Of Initial Business Combinations               30 days  
Threshold Period For Not To Transfer Assign Or Sell Any Shares Or Warrants After Completion Of Initial Business Combination               150 days  
Registration Rights Agreement [Member] | B Riley [Member] | Committed Equity Facility [Member]                  
Subsidiary, Sale of Stock [Line Items]                  
Share Price       $ 3.45   $ 3.45      
Aggregate purchase price $ 50,000,000                
Public Warrants [Member]                  
Subsidiary, Sale of Stock [Line Items]                  
Class of Warrant or Right, Outstanding   28,750,000              
Private Warrants [Member]                  
Subsidiary, Sale of Stock [Line Items]                  
Class of Warrant or Right, Outstanding   898,250              
Common Class A [Member]                  
Subsidiary, Sale of Stock [Line Items]                  
Description Of Common Stock And Outstanding Equity Award Stock               Burkhan agreed to the right to receive up to an aggregate amount of 2,600,000 shares of Blaize Holdings Class A Common Stock following the occurrence of each triggering event stated above (the “Burkhan Earnout Shares”). The Burkhan Earnout Shares will vest in four equal tranches of 325,000 shares plus 325,000 Blaize Holdings Class A Common Stock multiplied by the cash ratio (the “Proportionate Shares Number”). The “Cash Ratio” is the ratio equal to (x) Available Acquiror Cash, divided by (y) the Minimum Cash Amount (both of such terms as defined in the Merger Agreements).  
Common Class A [Member] | Non-Redemption Agreement [Member]                  
Subsidiary, Sale of Stock [Line Items]                  
Common Stock, Par or Stated Value Per Share               $ 0.0001  
Common Class A [Member] | Sponsor Notes [Member]                  
Subsidiary, Sale of Stock [Line Items]                  
Number Of Common Stock Pledge   2,000,000              
Issuance Of Sponsor Note Shares   750,000              
Common Class A [Member] | Earn Out Shares Issuance On When Price Per Share Of Class Common Stock Equals Or Exceeds [Member]                  
Subsidiary, Sale of Stock [Line Items]                  
Commonstock And Outstanding Equity Award   15,000,000              
Common Class A [Member] | Earnout Shares Issuance On When Price PerShare Of Class Common Stock Equals Or Exceeds Trigger One [Member]                  
Subsidiary, Sale of Stock [Line Items]                  
Commonstock And Outstanding Equity Award   3,750,000              
Common Stock And Outstanding Equity Award Stock Price Trigger   $ 12.5              
Common Stock And Outstanding Equity Award Threshold Trading Days   20 days              
Common Stock And Outstanding Equity Award Threshold Consecutive Tradingdays   30 days              
Common Class A [Member] | Earnout Shares Issuance On When Price Pershare Of Class Common Stock Equals Or Exceeds Trigger Two [Member]                  
Subsidiary, Sale of Stock [Line Items]                  
Commonstock And Outstanding Equity Award   3,750,000              
Common Stock And Outstanding Equity Award Stock Price Trigger   $ 15              
Common Stock And Outstanding Equity Award Threshold Trading Days   20 days              
Common Stock And Outstanding Equity Award Threshold Consecutive Tradingdays   30 days              
Common Class A [Member] | Earnout Shares Issuance On When Price Per Share Of Class Common Stock Equals Or Exceeds Trigger Three [Member]                  
Subsidiary, Sale of Stock [Line Items]                  
Commonstock And Outstanding Equity Award   3,750,000              
Common Stock And Outstanding Equity Award Stock Price Trigger   $ 17.5              
Common Stock And Outstanding Equity Award Threshold Trading Days   20 days              
Common Stock And Outstanding Equity Award Threshold Consecutive Tradingdays   30 days              
Common Class A [Member] | Earnout Shares Issuance On When Price Per Share Of Class Common Stock Equals Or Exceeds Trigger Four [Member]                  
Subsidiary, Sale of Stock [Line Items]                  
Commonstock And Outstanding Equity Award   3,750,000              
Common Stock And Outstanding Equity Award Stock Price Trigger   $ 20              
Common Stock And Outstanding Equity Award Threshold Trading Days   20 days              
Common Stock And Outstanding Equity Award Threshold Consecutive Tradingdays   30 days              
Common Class A Subject To Redemption [Member] | Lock Up Agreement [Member] | Merger Agreement [Member]                  
Subsidiary, Sale of Stock [Line Items]                  
Transfer Assign Or Sell Any Shares Or Warrants After Completion Of Initial Business Combination Stock Price Trigger               $ 12  
Merger Agreement [Member]                  
Subsidiary, Sale of Stock [Line Items]                  
Conversion of Stock, Description   each share of the Company’s common stock issued and outstanding were canceled and converted into the right to receive shares of Blaize Holdings Class A common stock and each share of Merger Sub Capital Stock was converted into one share of Blaize Holdings Class A common stock              
Conversion Of Stock Share Price   $ 0.0001              
Interest Holders [Member]                  
Subsidiary, Sale of Stock [Line Items]                  
Equity Method Investment, Ownership Percentage               65.00%  
Blaize Artificial Intelligence Middle East, LLC [Member]                  
Subsidiary, Sale of Stock [Line Items]                  
Subsidiary, Ownership Percentage, Parent               35.00%