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Merger and Reverse Recapitalization - Schedule of Number of Shares of Common Stock Outstanding on Merger (Details) - shares | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2025 | Jan. 14, 2025 | Jan. 13, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Business Acquisition [Line Items] |  |  |  |  |
Common stock, shares outstanding | 106,754,588 | 98,818,874 |  | 48,376,052 | 17,454,353
Sponsor forfeiture | (2,000,000) |  |  |  |
Shareholder Note receivable | 750,000 |  |  |  |
PIPE shares | 1,529,500 |  |  |  |
Merger And Pipe Financing Shares, Total | 11,408,957 |  |  |  |
Legacy Blaize shares | 87,314,968 |  |  |  |
Issuance of common stock to advisors | 94,949 |  |  |  |
Class A common stock [Member] | Bur Tech |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Common stock, shares outstanding |  |  | 10,816,995 |  |
Common stock shares subject to redemption outstanding prior to merger | 4,104,543 |  |  |  |
Redemption of common stock shares to business combination | (937,844) |  |  |  |
Non-redemption escrow | (2,854,242) |  |  |  |
Common stock (in shares) | 9,879,452 |  |  |  |
Class B Common Stock | Bur Tech |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Common stock, outstanding prior to the Merger | 5 |  |  |  |

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