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Business Combination - Reconciliation of Business Elements (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Reverse Recapitalization [Abstract] |  |
Cash proceeds from recapitalization | $ 276,210 | $ 0
Add: accrued interest receivable | 44 |
Add: advance to Legacy Oklo | 1,830 |
Add: prepaid expenses | 4 |
Less: transaction costs and advisor fees paid | (14,662) |
Less: advisor fees for Earnout Shares | (1,906) |
Cash and other assets acquired from the Business Combination | 261,520 |
Less: accounts payable | (12) |
Less: accrued expenses | (45) |
Less: excise tax payable | (2,159) |
Less: income taxes payable | (349) |
Net assets from the Business Combination recorded on the consolidated stockholders' equity (deficit) | $ 258,955 |

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- Definition Cash Acquired Through Reverse Recapitalization + References No definition available. + Details
Name: | oklo_CashAcquiredThroughReverseRecapitalization
Namespace Prefix: | oklo_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Payments Of Reverse Recapitalization, Transaction Costs And Advisor Fees + References No definition available. + Details
Name: | oklo_PaymentsOfReverseRecapitalizationTransactionCostsAndAdvisorFees
Namespace Prefix: | oklo_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Reverse Capitalization, Advisor Fees For Earnout Shares + References No definition available. + Details
Name: | oklo_ReverseCapitalizationAdvisorFeesForEarnoutShares
Namespace Prefix: | oklo_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Reverse Recapitalization + References No definition available. + Details
Name: | oklo_ReverseRecapitalizationAbstract
Namespace Prefix: | oklo_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Reverse Recapitalization, Accounts Payable + References No definition available. + Details
Name: | oklo_ReverseRecapitalizationAccountsPayable
Namespace Prefix: | oklo_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Reverse Recapitalization Accrued Expenses + References No definition available. + Details
Name: | oklo_ReverseRecapitalizationAccruedExpenses
Namespace Prefix: | oklo_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Reverse Recapitalization, Accrued Interest Receivable Acquired + References No definition available. + Details
Name: | oklo_ReverseRecapitalizationAccruedInterestReceivableAcquired
Namespace Prefix: | oklo_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Proceeds From Reverse Recapitalization, Advance Received + References No definition available. + Details
Name: | oklo_ReverseRecapitalizationAdvanceReceived
Namespace Prefix: | oklo_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Reverse Recapitalization, Cash And Other Assets + References No definition available. + Details
Name: | oklo_ReverseRecapitalizationCashAndOtherAssets
Namespace Prefix: | oklo_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Reverse Recapitalization, Excise Tax Payable + References No definition available. + Details
Name: | oklo_ReverseRecapitalizationExciseTaxPayable
Namespace Prefix: | oklo_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Reverse Recapitalization, Income Taxes Payable + References No definition available. + Details
Name: | oklo_ReverseRecapitalizationIncomeTaxesPayable
Namespace Prefix: | oklo_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Reverse Recapitalization, Net + References No definition available. + Details
Name: | oklo_ReverseRecapitalizationNet
Namespace Prefix: | oklo_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Reverse Recapitalization, Prepaid Expenses Acquired + References No definition available. + Details
Name: | oklo_ReverseRecapitalizationPrepaidExpensesAcquired
Namespace Prefix: | oklo_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration