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Merger and Reverse Recapitalization - Schedule of Legacy Share Reconciliation (Details) - shares | Mar. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | --- | ---
Business Acquisition [Line Items] |  |  |
Common Stock immediately after the Merger | 98,818,874 | 48,376,052 | 17,454,353
Legacy Blaize Shares |  |  |
Business Acquisition [Line Items] |  |  |
Common stock | 17,518,791 |  |
Conversion of redeemable convertible preferred stock | 44,506,781 |  |
Conversion of convertible notes | 40,302,382 |  |
Net exercise of warrants | 9,623,432 |  |
Common Stock immediately after the Merger | 111,951,386 |  |
Legacy Blaize Shares After Conversion |  |  |
Business Acquisition [Line Items] |  |  |
Common stock | 13,663,527 |  |
Conversion of redeemable convertible preferred stock | 34,712,525 |  |
Conversion of convertible notes | 31,433,259 |  |
Net exercise of warrants | 7,505,657 |  |
Common Stock immediately after the Merger | 87,314,968 |  |

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