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Description of Business - Additional Information (Details) - USD ($)
 3 Months Ended 12 Months Ended
Jan. 13, 2025
Dec. 31, 2023
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Dec. 31, 2023
Subsidiary, Sale of Stock [Line Items]            
Entity Incorporation, Date of Incorporation   Feb. 16, 2010        
Net income (loss)     $ (147,761,000) $ (16,743,000) $ (61,195,000) $ (87,589,000)
Working Capital Deficit, Net         114,500,000  
Accumulated Deficit   $ (368,056,000) (577,012,000)   (429,251,000) (368,056,000)
Cash and Cash Equivalents   $ 3,213,000 $ 44,967,000 $ 7,045,000 $ 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   $ 0.00001 $ 0.00001
Intangible Assets, Net (Including Goodwill)         $ 0  
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  
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  
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]            
Common Stock And Outstanding Equity Award Threshold Trading Days 20 days          
Common Stock And Outstanding Equity Award Threshold Consecutive Tradingdays 30 days          
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 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%   35.00%