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Cover Page
 3 Months Ended
Mar. 31, 2025
Document Information [Line Items]  
Document Type S-1/A
Entity Registrant Name Blaize Holdings, Inc.
Entity Incorporation, State or Country Code DE
Entity Tax Identification Number 86-2708752
Entity Address, Address Line One 4659 Golden Foothill Parkway
Entity Address, Address Line Two Suite 206
Entity Address, City or Town El Dorado Hills
Entity Address, State or Province CA
Entity Address, Postal Zip Code 95762
City Area Code 916
Local Phone Number 347-0050
Entity Filer Category Non-accelerated Filer
Entity Small Business true
Entity Emerging Growth Company true
Entity Ex Transition Period false
Entity Central Index Key 0001871638
Amendment Flag false
Entity Primary SIC Number 3674
Business Contact [Member]  
Document Information [Line Items]  
Entity Address, Address Line One 4659 Golden Foothill Parkway
Entity Address, Address Line Two Suite 206
Entity Address, City or Town El Dorado Hills
Entity Address, State or Province CA
Entity Address, Postal Zip Code 95762
City Area Code 916
Local Phone Number 347-0050
Contact Personnel Name Harminder Sehmi