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Convertible Notes and Demand Notes - Additional Information (Details) - USD ($) | 1 Months Ended | 2 Months Ended | 3 Months Ended | 5 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 30, 2023 | Feb. 28, 2023 | Jun. 30, 2024 | Nov. 30, 2023 | Sep. 30, 2025 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 22, 2023 | Jul. 01, 2023 | Feb. 01, 2023
Convertible Notes and Demand Notes [Line Items] |  |  |  |  |  |  |  |  |  |  |
Change in fair value of debt instrument |  |  |  |  |  | $ 8,700,000 |  |  |  |  |
Fair value adjustment of warrants |  |  |  |  |  | $ 5,701,000 | $ 945,000 |  |  |  |
Common stock, shares issued (in shares) |  |  |  |  | 106,754,588 | 48,376,052 | 17,454,353 |  |  |  |
Related Party |  |  |  |  |  |  |  |  |  |  |
Convertible Notes and Demand Notes [Line Items] |  |  |  |  |  |  |  |  |  |  |
Outstanding advances from related party |  |  |  |  | $ 2,900,000 | $ 0 |  |  |  |  |
BURTECH ACQUISITION CORP [Member] |  |  |  |  |  |  |  |  |  |  |
Convertible Notes and Demand Notes [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common stock, shares issued (in shares) |  |  |  |  | 87,314,968 |  |  |  |  |  |
Working Capital Loans Warrant [Member] | BURTECH ACQUISITION CORP [Member] |  |  |  |  |  |  |  |  |  |  |
Convertible Notes and Demand Notes [Line Items] |  |  |  |  |  |  |  |  |  |  |
Outstanding balance |  |  |  |  | $ 1,500,000 | 0 |  |  |  |  |
2023 Note Purchase and Exchange Agreement [Member] |  |  |  |  |  |  |  |  |  |  |
Convertible Notes and Demand Notes [Line Items] |  |  |  |  |  |  |  |  |  |  |
Grant of restricted stock unit |  |  |  |  |  |  | $ 6,000,000 |  |  |  |
Blaize Note Financing Agreement [Member] | RT Parties [Member] |  |  |  |  |  |  |  |  |  |  |
Convertible Notes and Demand Notes [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amount of investment by separate third party group of investors to the agreement |  |  |  |  |  | 125,000,000 |  |  |  |  |
Pay-to-Play Convertible Notes [Member] |  |  |  |  |  |  |  |  |  |  |
Convertible Notes and Demand Notes [Line Items] |  |  |  |  |  |  |  |  |  |  |
Change in fair value of debt instrument |  |  |  |  |  | 1,300,000 | 2,600,000 |  |  |  |
Fair value adjustment of warrants |  |  |  |  |  |  | 61,000,000 |  |  |  |
Restoration of common share incremental value | $ 5,200,000 |  |  |  |  |  |  |  |  |  |
Pay-to-Play Convertible Notes [Member] | 2022 Note Purchase and Exchange Agreement [Member] |  |  |  |  |  |  |  |  |  |  |
Convertible Notes and Demand Notes [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of debt |  | $ 9,300,000 |  |  |  |  |  |  |  |  |
Debt instrument, maturity date | Dec. 09, 2024 |  |  |  | Dec. 09, 2024 |  |  |  |  |  |
Pay-to-Play Convertible Notes [Member] | Exchange Agreement [Member] |  |  |  |  |  |  |  |  |  |  |
Convertible Notes and Demand Notes [Line Items] |  |  |  |  |  |  |  |  |  |  |
Pro rata basis of consideration |  |  |  |  |  |  |  | $ 20,000,000 |  |  |
Proceeds from issuance of warrants | $ 100,000 |  |  |  |  |  |  |  |  |  |
2023 Convertible Note [Member] |  |  |  |  |  |  |  |  |  |  |
Convertible Notes and Demand Notes [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of debt |  |  |  | $ 12,300,000 |  | $ 110,700,000 |  |  |  |  |
Exercise price of warrants |  |  |  |  |  | $ 11.5 |  |  |  |  |
2023 Convertible Note [Member] | 2023 Note Purchase and Exchange Agreement [Member] |  |  |  |  |  |  |  |  |  |  |
Convertible Notes and Demand Notes [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate during period |  |  |  | 10.00% |  |  |  |  |  |  |
Change in fair value of debt instrument |  |  |  |  |  |  | 6,900,000 |  |  |  |
Percentage of price of the equity share |  |  |  |  |  |  |  |  |  | 80.00% |
Percentage of conversion price |  |  |  |  |  |  |  |  |  | 80.00% |
Fair value of common stock |  |  |  |  |  |  | 2.6 |  |  |  |
Restricted stock unit vesting outstanding |  |  |  |  |  |  | $ 6,000,000 |  |  |  |
Common stock, shares issued (in shares) |  |  |  |  |  |  | 6,000,000 |  |  |  |
Debt Instrument Maturity Period |  |  |  | 18 months |  |  |  |  |  |  |
2023 Convertible Note [Member] | Restricted Stock Units (RSUs) [Member] | 2023 Note Purchase and Exchange Agreement [Member] |  |  |  |  |  |  |  |  |  |  |
Convertible Notes and Demand Notes [Line Items] |  |  |  |  |  |  |  |  |  |  |
Grant of restricted stock unit |  |  |  |  |  |  | $ 6,000,000 |  |  |  |
Demand Note [Member] |  |  |  |  |  |  |  |  |  |  |
Convertible Notes and Demand Notes [Line Items] |  |  |  |  |  |  |  |  |  |  |
Issue short term demand notes |  |  |  |  |  |  | 5,100,000 |  |  |  |
Short term demand note outstanding |  |  |  |  |  |  | $ 4,800,000 |  |  |  |
Percentage demand note outstanding |  |  |  |  |  |  | (12.00%) |  |  |  |
Demand notes payable |  |  |  |  |  |  | $ 15,000,000 |  |  |  |
Repayments of Notes Payable |  |  | $ 5,000,000 |  |  |  |  |  |  |  |
10% secured convertible notes [Member] |  |  |  |  |  |  |  |  |  |  |
Convertible Notes and Demand Notes [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of debt |  |  |  |  |  | $ 110,700,000 |  |  |  |  |
Debt instrument, interest rate during period |  |  |  |  |  | 10.00% |  |  |  |  |
10% secured convertible notes [Member] | BurTech [Member] |  |  |  |  |  |  |  |  |  |  |
Convertible Notes and Demand Notes [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of debt |  |  |  |  |  | $ 11,500,000 |  |  |  |  |
10% secured convertible notes [Member] | Outside Individual Third Parties [Member] |  |  |  |  |  |  |  |  |  |  |
Convertible Notes and Demand Notes [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of debt |  |  |  |  |  | 2,400,000 |  |  |  |  |
10% secured convertible notes [Member] | RT Parties [Member] |  |  |  |  |  |  |  |  |  |  |
Convertible Notes and Demand Notes [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of debt |  |  |  |  |  | $ 96,800,000 |  |  |  |  |
Pay to Play warrants [Member] |  |  |  |  |  |  |  |  |  |  |
Convertible Notes and Demand Notes [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, periodic payment, interest |  |  |  |  |  |  |  | 5,000,000 |  |  |
Pay to Play warrants [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Convertible Notes and Demand Notes [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, periodic payment, interest |  |  |  |  |  |  |  | 5,000,000 |  |  |
Pay to Play warrants [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |
Convertible Notes and Demand Notes [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, periodic payment, interest |  |  |  |  |  |  |  | $ 1,000,000 |  |  |
Pay to Play warrants [Member] | 2022 Note Purchase and Exchange Agreement [Member] |  |  |  |  |  |  |  |  |  |  |
Convertible Notes and Demand Notes [Line Items] |  |  |  |  |  |  |  |  |  |  |
Raising capital of gross proceeds |  |  |  |  |  |  |  |  | $ 5,000,000 |  |
Pay to Play warrants [Member] | Exchange Agreement [Member] |  |  |  |  |  |  |  |  |  |  |
Convertible Notes and Demand Notes [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of warrants | $ 100,000 |  |  |  |  |  |  |  |  |  |
Unsecured Convertible Promissory Note [Member] | Working Capital Loans Warrant [Member] | BURTECH ACQUISITION CORP [Member] |  |  |  |  |  |  |  |  |  |  |
Convertible Notes and Demand Notes [Line Items] |  |  |  |  |  |  |  |  |  |  |
Price per which the outstanding principal amount can be converted |  |  |  |  |  |  |  |  |  |  | $ 10
Amount borrowed |  |  |  |  |  |  |  |  |  |  | $ 1,500,000

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