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Business Combination - Shares Outstanding Following the Closing of Business Combination (Details) - shares | May 09, 2024 | May 08, 2024 | Dec. 31, 2024 | Dec. 31, 2023 | Nov. 05, 2018
--- | --- | --- | --- | --- | ---
Reverse Recapitalization [Line Items] |  |  |  |  |
Common stock, outstanding (in shares) | 122,096,270 | 1,386,983 | 137,706,596 | 69,242,940 |
Contingent consideration, (in shares) | 15,000,000 | 78,996,459 |  |  |
Shares issued (in shares) |  |  | 137,706,596 | 69,242,940 | 39,923,611
Common Class A |  |  |  |  |
Reverse Recapitalization [Line Items] |  |  |  |  |
Reserved for future issuance (in shares) | 10,432,749 |  |  |  |
Common Class A | Employee Stock Option |  |  |  |  |
Reverse Recapitalization [Line Items] |  |  |  |  |
Reserved for future issuance (in shares) | 10,432,749 |  |  |  |
Legacy Oklo Stock Holders |  |  |  |  |
Reverse Recapitalization [Line Items] |  |  |  |  |
Common stock, outstanding (in shares) | 78,996,459 |  |  |  |
Legacy Oklo Stockholders, Excluding SAFE Conversion |  |  |  |  |
Reverse Recapitalization [Line Items] |  |  |  |  |
Common stock, outstanding (in shares) | 70,588,565 |  |  |  |
Legacy Oklo Stockholders, Preferred And Common |  |  |  |  |
Reverse Recapitalization [Line Items] |  |  |  |  |
Common stock, outstanding (in shares) | 68,845,564 |  |  |  |
Legacy Oklo Preferred Stock Holders |  |  |  |  |
Reverse Recapitalization [Line Items] |  |  |  |  |
Common stock, outstanding (in shares) | 39,923,611 |  |  |  |
Legacy Oklo Common Stock Holders |  |  |  |  |
Reverse Recapitalization [Line Items] |  |  |  |  |
Common stock, outstanding (in shares) | 28,921,953 |  |  |  |
Legacy Oklo Common Stock Holders | Previously Reported |  |  |  |  |
Reverse Recapitalization [Line Items] |  |  |  |  |
Common stock, outstanding (in shares) |  | 4,771,025 |  |  |
Legacy Oklo Option Holders, Exercised 2024 |  |  |  |  |
Reverse Recapitalization [Line Items] |  |  |  |  |
Common stock, outstanding (in shares) | 1,345,625 |  |  |  |
Legacy Oklo Option Holders, Exercised 2023 |  |  |  |  |
Reverse Recapitalization [Line Items] |  |  |  |  |
Common stock, outstanding (in shares) | 397,376 |  |  |  |
Legacy Oklo Stockholders, SAFE Conversion |  |  |  |  |
Reverse Recapitalization [Line Items] |  |  |  |  |
Common stock, outstanding (in shares) | 8,407,894 |  |  |  |
AltC Stockholders |  |  |  |  |
Reverse Recapitalization [Line Items] |  |  |  |  |
Common stock, outstanding (in shares) | 43,099,811 |  |  |  |
Sponsor Stockholders |  |  |  |  |
Reverse Recapitalization [Line Items] |  |  |  |  |
Common stock, outstanding (in shares) | 13,950,000 |  |  |  |
AltC Public Stockholders |  |  |  |  |
Reverse Recapitalization [Line Items] |  |  |  |  |
Common stock, outstanding (in shares) | 29,149,811 |  |  |  |
Sponsor Stockholders, Not Subject To Forfeiture |  |  |  |  |
Reverse Recapitalization [Line Items] |  |  |  |  |
Shares issued (in shares) | 12,500,000 |  |  |  |
Sponsor Stockholders, Prior AltC Shareholders |  |  |  |  |
Reverse Recapitalization [Line Items] |  |  |  |  |
Shares issued (in shares) | 1,450,000 |  |  |  |

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