3.24.2.u1 html 632 387 1 false 175 0 false 10 false false R1.htm 0000001 - Document - Cover Sheet http://nkgenbiotech.com/role/Cover Cover Cover 1 false false R2.htm 9952151 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS Sheet http://nkgenbiotech.com/role/CONDENSEDCONSOLIDATEDBALANCESHEETS CONDENSED CONSOLIDATED BALANCE SHEETS Statements 2 false false R3.htm 9952152 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) Sheet http://nkgenbiotech.com/role/CONDENSEDCONSOLIDATEDBALANCESHEETSParenthetical CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) Statements 3 false false R4.htm 9952153 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS Sheet http://nkgenbiotech.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFOPERATIONSANDCOMPREHENSIVELOSS CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS Statements 4 false false R5.htm 9952154 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS (Parenthetical) Sheet http://nkgenbiotech.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFOPERATIONSANDCOMPREHENSIVELOSSParenthetical CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS (Parenthetical) Statements 5 false false R6.htm 9952155 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS??? DEFICIT Sheet http://nkgenbiotech.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFSTOCKHOLDERSDEFICIT CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS??? DEFICIT Statements 6 false false R7.htm 9952156 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS Sheet http://nkgenbiotech.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS Statements 7 false false R8.htm 9952157 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) Sheet http://nkgenbiotech.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWSParenthetical CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) Statements 8 false false R9.htm 9952158 - Disclosure - Company Information Sheet http://nkgenbiotech.com/role/CompanyInformation Company Information Notes 9 false false R10.htm 9952159 - Disclosure - Summary of Significant Accounting Policies Sheet http://nkgenbiotech.com/role/SummaryofSignificantAccountingPolicies Summary of Significant Accounting Policies Notes 10 false false R11.htm 9952160 - Disclosure - Reverse Recapitalization Sheet http://nkgenbiotech.com/role/ReverseRecapitalization Reverse Recapitalization Notes 11 false false R12.htm 9952161 - Disclosure - Private Placement Sheet http://nkgenbiotech.com/role/PrivatePlacement Private Placement Notes 12 false false R13.htm 9952162 - Disclosure - Warrants Sheet http://nkgenbiotech.com/role/Warrants Warrants Notes 13 false false R14.htm 9952163 - Disclosure - Convertible Notes Notes http://nkgenbiotech.com/role/ConvertibleNotes Convertible Notes Notes 14 false false R15.htm 9952164 - Disclosure - Debt Sheet http://nkgenbiotech.com/role/Debt Debt Notes 15 false false R16.htm 9952165 - Disclosure - Related-Party Transactions Sheet http://nkgenbiotech.com/role/RelatedPartyTransactions Related-Party Transactions Notes 16 false false R17.htm 9952166 - Disclosure - Fair Value of Financial Instruments Sheet http://nkgenbiotech.com/role/FairValueofFinancialInstruments Fair Value of Financial Instruments Notes 17 false false R18.htm 9952167 - Disclosure - Stockholders' Deficit Sheet http://nkgenbiotech.com/role/StockholdersDeficit Stockholders' Deficit Notes 18 false false R19.htm 9952168 - Disclosure - Property and Equipment, net Sheet http://nkgenbiotech.com/role/PropertyandEquipmentnet Property and Equipment, net Notes 19 false false R20.htm 9952169 - Disclosure - Additional Balance Sheet Information Sheet http://nkgenbiotech.com/role/AdditionalBalanceSheetInformation Additional Balance Sheet Information Notes 20 false false R21.htm 9952170 - Disclosure - Additional Statements of Operations Information Sheet http://nkgenbiotech.com/role/AdditionalStatementsofOperationsInformation Additional Statements of Operations Information Notes 21 false false R22.htm 9952171 - Disclosure - Collaboration Agreement Sheet http://nkgenbiotech.com/role/CollaborationAgreement Collaboration Agreement Notes 22 false false R23.htm 9952172 - Disclosure - Commitments and Contingencies Sheet http://nkgenbiotech.com/role/CommitmentsandContingencies Commitments and Contingencies Notes 23 false false R24.htm 9952173 - Disclosure - Income Taxes Sheet http://nkgenbiotech.com/role/IncomeTaxes Income Taxes Notes 24 false false R25.htm 9952174 - Disclosure - Subsequent Events Sheet http://nkgenbiotech.com/role/SubsequentEvents Subsequent Events Notes 25 false false R26.htm 9954471 - Disclosure - Summary of Significant Accounting Policies (Policies) Sheet http://nkgenbiotech.com/role/SummaryofSignificantAccountingPoliciesPolicies Summary of Significant Accounting Policies (Policies) Policies http://nkgenbiotech.com/role/SummaryofSignificantAccountingPolicies 26 false false R27.htm 9954472 - Disclosure - Summary of Significant Accounting Policies (Tables) Sheet http://nkgenbiotech.com/role/SummaryofSignificantAccountingPoliciesTables Summary of Significant Accounting Policies (Tables) Tables http://nkgenbiotech.com/role/SummaryofSignificantAccountingPolicies 27 false false R28.htm 9954473 - Disclosure - Reverse Recapitalization (Tables) Sheet http://nkgenbiotech.com/role/ReverseRecapitalizationTables Reverse Recapitalization (Tables) Tables http://nkgenbiotech.com/role/ReverseRecapitalization 28 false false R29.htm 9954474 - Disclosure - Private Placement (Tables) Sheet http://nkgenbiotech.com/role/PrivatePlacementTables Private Placement (Tables) Tables http://nkgenbiotech.com/role/PrivatePlacement 29 false false R30.htm 9954475 - Disclosure - Warrants (Tables) Sheet http://nkgenbiotech.com/role/WarrantsTables Warrants (Tables) Tables http://nkgenbiotech.com/role/Warrants 30 false false R31.htm 9954476 - Disclosure - Convertible Notes (Tables) Notes http://nkgenbiotech.com/role/ConvertibleNotesTables Convertible Notes (Tables) Tables http://nkgenbiotech.com/role/ConvertibleNotes 31 false false R32.htm 9954477 - Disclosure - Fair Value of Financial Instruments (Tables) Sheet http://nkgenbiotech.com/role/FairValueofFinancialInstrumentsTables Fair Value of Financial Instruments (Tables) Tables http://nkgenbiotech.com/role/FairValueofFinancialInstruments 32 false false R33.htm 9954478 - Disclosure - Stockholders' Deficit (Tables) Sheet http://nkgenbiotech.com/role/StockholdersDeficitTables Stockholders' Deficit (Tables) Tables http://nkgenbiotech.com/role/StockholdersDeficit 33 false false R34.htm 9954479 - Disclosure - Property and Equipment, net (Tables) Sheet http://nkgenbiotech.com/role/PropertyandEquipmentnetTables Property and Equipment, net (Tables) Tables http://nkgenbiotech.com/role/PropertyandEquipmentnet 34 false false R35.htm 9954480 - Disclosure - Additional Balance Sheet Information (Tables) Sheet http://nkgenbiotech.com/role/AdditionalBalanceSheetInformationTables Additional Balance Sheet Information (Tables) Tables http://nkgenbiotech.com/role/AdditionalBalanceSheetInformation 35 false false R36.htm 9954481 - Disclosure - Additional Statements of Operations Information (Tables) Sheet http://nkgenbiotech.com/role/AdditionalStatementsofOperationsInformationTables Additional Statements of Operations Information (Tables) Tables http://nkgenbiotech.com/role/AdditionalStatementsofOperationsInformation 36 false false R37.htm 9954482 - Disclosure - Commitment and Contingencies (Tables) Sheet http://nkgenbiotech.com/role/CommitmentandContingenciesTables Commitment and Contingencies (Tables) Tables 37 false false R38.htm 9954483 - Disclosure - Company Information (Details) Sheet http://nkgenbiotech.com/role/CompanyInformationDetails Company Information (Details) Details http://nkgenbiotech.com/role/CompanyInformation 38 false false R39.htm 9954484 - Disclosure - Summary of Significant Accounting Policies - Narrative (Details) Sheet http://nkgenbiotech.com/role/SummaryofSignificantAccountingPoliciesNarrativeDetails Summary of Significant Accounting Policies - Narrative (Details) Details 39 false false R40.htm 9954485 - Disclosure - Summary of Significant Accounting Policies - Schedule of Potentially Antidilutive Shares Excluded from Computation of Diluted Net Loss Per Share (Details) Sheet http://nkgenbiotech.com/role/SummaryofSignificantAccountingPoliciesScheduleofPotentiallyAntidilutiveSharesExcludedfromComputationofDilutedNetLossPerShareDetails Summary of Significant Accounting Policies - Schedule of Potentially Antidilutive Shares Excluded from Computation of Diluted Net Loss Per Share (Details) Details 40 false false R41.htm 9954486 - Disclosure - Reverse Recapitalization - Narrative (Details) Sheet http://nkgenbiotech.com/role/ReverseRecapitalizationNarrativeDetails Reverse Recapitalization - Narrative (Details) Details 41 false false R42.htm 9954487 - Disclosure - Reverse Recapitalization - Schedule of Reverse Recapitalization - Share Impact (Details) Sheet http://nkgenbiotech.com/role/ReverseRecapitalizationScheduleofReverseRecapitalizationShareImpactDetails Reverse Recapitalization - Schedule of Reverse Recapitalization - Share Impact (Details) Details 42 false false R43.htm 9954488 - Disclosure - Reverse Recapitalization - Schedule of Reverse Recapitalization - Reconciliation Elements of The Business Combination to the Company???s Unaudited Condensed Consolidated Financial Statements (Details) Sheet http://nkgenbiotech.com/role/ReverseRecapitalizationScheduleofReverseRecapitalizationReconciliationElementsofTheBusinessCombinationtotheCompanysUnauditedCondensedConsolidatedFinancialStatementsDetails Reverse Recapitalization - Schedule of Reverse Recapitalization - Reconciliation Elements of The Business Combination to the Company???s Unaudited Condensed Consolidated Financial Statements (Details) Details 43 false false R44.htm 9954489 - Disclosure - Private Placement - Additional Information (Details) Sheet http://nkgenbiotech.com/role/PrivatePlacementAdditionalInformationDetails Private Placement - Additional Information (Details) Details 44 false false R45.htm 9954490 - Disclosure - Private Placement - Forward Purchase Contract (Details) Sheet http://nkgenbiotech.com/role/PrivatePlacementForwardPurchaseContractDetails Private Placement - Forward Purchase Contract (Details) Details 45 false false R46.htm 9954491 - Disclosure - Private Placement - Schedule of Sales of FPA Shares and Proceeds to the Company (Details) Sheet http://nkgenbiotech.com/role/PrivatePlacementScheduleofSalesofFPASharesandProceedstotheCompanyDetails Private Placement - Schedule of Sales of FPA Shares and Proceeds to the Company (Details) Details 46 false false R47.htm 9954492 - Disclosure - Private Placement - Reconciliation of the Subscription Receivable and Forward Purchase Derivative Liabilities (Details) Sheet http://nkgenbiotech.com/role/PrivatePlacementReconciliationoftheSubscriptionReceivableandForwardPurchaseDerivativeLiabilitiesDetails Private Placement - Reconciliation of the Subscription Receivable and Forward Purchase Derivative Liabilities (Details) Details 47 false false R48.htm 9954493 - Disclosure - Warrants - Narrative (Details) Sheet http://nkgenbiotech.com/role/WarrantsNarrativeDetails Warrants - Narrative (Details) Details 48 false false R49.htm 9954494 - Disclosure - Warrants - Schedule of Derivative Instruments (Details) Sheet http://nkgenbiotech.com/role/WarrantsScheduleofDerivativeInstrumentsDetails Warrants - Schedule of Derivative Instruments (Details) Details 49 false false R50.htm 9954495 - Disclosure - Convertible Notes - Consideration Shares (Details) Notes http://nkgenbiotech.com/role/ConvertibleNotesConsiderationSharesDetails Convertible Notes - Consideration Shares (Details) Details 50 false false R51.htm 9954496 - Disclosure - Convertible Notes - 2024 Convertible Bridge Loans (Details) Notes http://nkgenbiotech.com/role/ConvertibleNotes2024ConvertibleBridgeLoansDetails Convertible Notes - 2024 Convertible Bridge Loans (Details) Details 51 false false R52.htm 9954497 - Disclosure - Convertible Notes - 2024 Convertible Notes (Details) Notes http://nkgenbiotech.com/role/ConvertibleNotes2024ConvertibleNotesDetails Convertible Notes - 2024 Convertible Notes (Details) Details 52 false false R53.htm 9954498 - Disclosure - Convertible Notes - Schedule of Reconciliation of Senior Convertible Notes (Details) Notes http://nkgenbiotech.com/role/ConvertibleNotesScheduleofReconciliationofSeniorConvertibleNotesDetails Convertible Notes - Schedule of Reconciliation of Senior Convertible Notes (Details) Details 53 false false R54.htm 9954499 - Disclosure - Convertible Notes - Schedule of Convertible Notes (Details) Notes http://nkgenbiotech.com/role/ConvertibleNotesScheduleofConvertibleNotesDetails Convertible Notes - Schedule of Convertible Notes (Details) Details 54 false false R55.htm 9954500 - Disclosure - Convertible Notes - Senior Convertible Notes (Details) Notes http://nkgenbiotech.com/role/ConvertibleNotesSeniorConvertibleNotesDetails Convertible Notes - Senior Convertible Notes (Details) Details 55 false false R56.htm 9954501 - Disclosure - Convertible Notes - Legacy Convertible Notes (Details) Notes http://nkgenbiotech.com/role/ConvertibleNotesLegacyConvertibleNotesDetails Convertible Notes - Legacy Convertible Notes (Details) Details 56 false false R57.htm 9954502 - Disclosure - Debt (Details) Sheet http://nkgenbiotech.com/role/DebtDetails Debt (Details) Details http://nkgenbiotech.com/role/Debt 57 false false R58.htm 9954503 - Disclosure - Related-Party Transactions (Details) Sheet http://nkgenbiotech.com/role/RelatedPartyTransactionsDetails Related-Party Transactions (Details) Details http://nkgenbiotech.com/role/RelatedPartyTransactions 58 false false R59.htm 9954504 - Disclosure - Fair Value of Financial Instruments - Schedule of Fair Value Hierarchy (Details) Sheet http://nkgenbiotech.com/role/FairValueofFinancialInstrumentsScheduleofFairValueHierarchyDetails Fair Value of Financial Instruments - Schedule of Fair Value Hierarchy (Details) Details 59 false false R60.htm 9954505 - Disclosure - Fair Value of Financial Instruments - Narrative (Details) Sheet http://nkgenbiotech.com/role/FairValueofFinancialInstrumentsNarrativeDetails Fair Value of Financial Instruments - Narrative (Details) Details 60 false false R61.htm 9954506 - Disclosure - Fair Value of Financial Instruments - Schedule of Reconciliation of 2024 Convertible Notes (Details) Notes http://nkgenbiotech.com/role/FairValueofFinancialInstrumentsScheduleofReconciliationof2024ConvertibleNotesDetails Fair Value of Financial Instruments - Schedule of Reconciliation of 2024 Convertible Notes (Details) Details 61 false false R62.htm 9954507 - Disclosure - Fair Value of Financial Instruments - Schedule of Valuation Assumptions, 2024 Convertible Notes One (Details) Notes http://nkgenbiotech.com/role/FairValueofFinancialInstrumentsScheduleofValuationAssumptions2024ConvertibleNotesOneDetails Fair Value of Financial Instruments - Schedule of Valuation Assumptions, 2024 Convertible Notes One (Details) Details 62 false false R63.htm 9954508 - Disclosure - Fair Value of Financial Instruments - Schedule of Valuation Assumptions, 2024 Convertible Notes Two (Details) Notes http://nkgenbiotech.com/role/FairValueofFinancialInstrumentsScheduleofValuationAssumptions2024ConvertibleNotesTwoDetails Fair Value of Financial Instruments - Schedule of Valuation Assumptions, 2024 Convertible Notes Two (Details) Details 63 false false R64.htm 9954509 - Disclosure - Fair Value of Financial Instruments - Schedule of Derivative Liabilities (Details) Sheet http://nkgenbiotech.com/role/FairValueofFinancialInstrumentsScheduleofDerivativeLiabilitiesDetails Fair Value of Financial Instruments - Schedule of Derivative Liabilities (Details) Details 64 false false R65.htm 9954510 - Disclosure - Fair Value of Financial Instruments - Schedule of Valuation Assumptions, PIPE Warrants (Details) Sheet http://nkgenbiotech.com/role/FairValueofFinancialInstrumentsScheduleofValuationAssumptionsPIPEWarrantsDetails Fair Value of Financial Instruments - Schedule of Valuation Assumptions, PIPE Warrants (Details) Details 65 false false R66.htm 9954511 - Disclosure - Fair Value of Financial Instruments - Schedule of Valuation Assumptions, Private Warrants and Working Capital Warrants (Details) Sheet http://nkgenbiotech.com/role/FairValueofFinancialInstrumentsScheduleofValuationAssumptionsPrivateWarrantsandWorkingCapitalWarrantsDetails Fair Value of Financial Instruments - Schedule of Valuation Assumptions, Private Warrants and Working Capital Warrants (Details) Details 66 false false R67.htm 9954512 - Disclosure - Fair Value of Financial Instruments - Schedule of Valuation Assumptions, Convertible Bridge Loan Warrants and Convertible 2024 Note Warrants (Details) Sheet http://nkgenbiotech.com/role/FairValueofFinancialInstrumentsScheduleofValuationAssumptionsConvertibleBridgeLoanWarrantsandConvertible2024NoteWarrantsDetails Fair Value of Financial Instruments - Schedule of Valuation Assumptions, Convertible Bridge Loan Warrants and Convertible 2024 Note Warrants (Details) Details 67 false false R68.htm 9954513 - Disclosure - Fair Value of Financial Instruments - Schedule of Valuation Assumptions of Forward Purchase Derivative Liability (Details) Sheet http://nkgenbiotech.com/role/FairValueofFinancialInstrumentsScheduleofValuationAssumptionsofForwardPurchaseDerivativeLiabilityDetails Fair Value of Financial Instruments - Schedule of Valuation Assumptions of Forward Purchase Derivative Liability (Details) Details 68 false false R69.htm 9954514 - Disclosure - Fair Value of Financial Instruments - Consideration Shares (Details) Sheet http://nkgenbiotech.com/role/FairValueofFinancialInstrumentsConsiderationSharesDetails Fair Value of Financial Instruments - Consideration Shares (Details) Details 69 false false R70.htm 9954515 - Disclosure - Fair Value of Financial Instruments - Tranche Rights (Details) Sheet http://nkgenbiotech.com/role/FairValueofFinancialInstrumentsTrancheRightsDetails Fair Value of Financial Instruments - Tranche Rights (Details) Details 70 false false R71.htm 9954516 - Disclosure - Fair Value of Financial Instruments - Schedule of Valuation Assumptions, Tranche Rights (Details) Sheet http://nkgenbiotech.com/role/FairValueofFinancialInstrumentsScheduleofValuationAssumptionsTrancheRightsDetails Fair Value of Financial Instruments - Schedule of Valuation Assumptions, Tranche Rights (Details) Details 71 false false R72.htm 9954517 - Disclosure - Stockholders' Deficit - Narrative (Details) Sheet http://nkgenbiotech.com/role/StockholdersDeficitNarrativeDetails Stockholders' Deficit - Narrative (Details) Details 72 false false R73.htm 9954518 - Disclosure - Stockholders' Deficit - Schedule of Stock Option Activity (Details) Sheet http://nkgenbiotech.com/role/StockholdersDeficitScheduleofStockOptionActivityDetails Stockholders' Deficit - Schedule of Stock Option Activity (Details) Details 73 false false R74.htm 9954519 - Disclosure - Stockholders' Deficit - Schedule of Stock Option Valuation Assumptions (Details) Sheet http://nkgenbiotech.com/role/StockholdersDeficitScheduleofStockOptionValuationAssumptionsDetails Stockholders' Deficit - Schedule of Stock Option Valuation Assumptions (Details) Details 74 false false R75.htm 9954520 - Disclosure - Stockholders' Deficit - Schedule of Stock Options Vested and Expected to Vest (Details) Sheet http://nkgenbiotech.com/role/StockholdersDeficitScheduleofStockOptionsVestedandExpectedtoVestDetails Stockholders' Deficit - Schedule of Stock Options Vested and Expected to Vest (Details) Details 75 false false R76.htm 9954521 - Disclosure - Stockholders' Deficit - Schedule of Compensation Expense (Details) Sheet http://nkgenbiotech.com/role/StockholdersDeficitScheduleofCompensationExpenseDetails Stockholders' Deficit - Schedule of Compensation Expense (Details) Details 76 false false R77.htm 9954522 - Disclosure - Property and Equipment, net - Schedule of Property and Equipment, Net (Details) Sheet http://nkgenbiotech.com/role/PropertyandEquipmentnetScheduleofPropertyandEquipmentNetDetails Property and Equipment, net - Schedule of Property and Equipment, Net (Details) Details 77 false false R78.htm 9954523 - Disclosure - Property and Equipment, net - Narrative (Details) Sheet http://nkgenbiotech.com/role/PropertyandEquipmentnetNarrativeDetails Property and Equipment, net - Narrative (Details) Details 78 false false R79.htm 9954524 - Disclosure - Additional Balance Sheet Information - Schedule of Prepaid Expenses and Other Current Assets (Details) Sheet http://nkgenbiotech.com/role/AdditionalBalanceSheetInformationScheduleofPrepaidExpensesandOtherCurrentAssetsDetails Additional Balance Sheet Information - Schedule of Prepaid Expenses and Other Current Assets (Details) Details 79 false false R80.htm 9954525 - Disclosure - Additional Balance Sheet Information - Schedule of Accounts Payable and Accrued Expenses (Details) Sheet http://nkgenbiotech.com/role/AdditionalBalanceSheetInformationScheduleofAccountsPayableandAccruedExpensesDetails Additional Balance Sheet Information - Schedule of Accounts Payable and Accrued Expenses (Details) Details 80 false false R81.htm 9954526 - Disclosure - Additional Statements of Operations Information - Loss on Issuance of Financial Instruments Consists (Details) Sheet http://nkgenbiotech.com/role/AdditionalStatementsofOperationsInformationLossonIssuanceofFinancialInstrumentsConsistsDetails Additional Statements of Operations Information - Loss on Issuance of Financial Instruments Consists (Details) Details 81 false false R82.htm 9954527 - Disclosure - Additional Statements of Operations Information - Loss on Amendments to Financial Instruments Consists (Details) Sheet http://nkgenbiotech.com/role/AdditionalStatementsofOperationsInformationLossonAmendmentstoFinancialInstrumentsConsistsDetails Additional Statements of Operations Information - Loss on Amendments to Financial Instruments Consists (Details) Details 82 false false R83.htm 9954528 - Disclosure - Additional Statements of Operations Information - Change in Fair Value of Financial Instruments Consists (Details) Sheet http://nkgenbiotech.com/role/AdditionalStatementsofOperationsInformationChangeinFairValueofFinancialInstrumentsConsistsDetails Additional Statements of Operations Information - Change in Fair Value of Financial Instruments Consists (Details) Details 83 false false R84.htm 9954529 - Disclosure - Collaboration Agreement (Details) Sheet http://nkgenbiotech.com/role/CollaborationAgreementDetails Collaboration Agreement (Details) Details http://nkgenbiotech.com/role/CollaborationAgreement 84 false false R85.htm 9954530 - Disclosure - Commitments and Contingencies - Narrative (Details) Sheet http://nkgenbiotech.com/role/CommitmentsandContingenciesNarrativeDetails Commitments and Contingencies - Narrative (Details) Details 85 false false R86.htm 9954531 - Disclosure - Commitments and Contingencies - Schedule of Future Minimum Rental Payments for Operating Leases (Details) Sheet http://nkgenbiotech.com/role/CommitmentsandContingenciesScheduleofFutureMinimumRentalPaymentsforOperatingLeasesDetails Commitments and Contingencies - Schedule of Future Minimum Rental Payments for Operating Leases (Details) Details 86 false false R87.htm 9954532 - Disclosure - Income Taxes (Details) Sheet http://nkgenbiotech.com/role/IncomeTaxesDetails Income Taxes (Details) Details http://nkgenbiotech.com/role/IncomeTaxes 87 false false R88.htm 9954533 - Disclosure - Subsequent Events (Details) Sheet http://nkgenbiotech.com/role/SubsequentEventsDetails Subsequent Events (Details) Details http://nkgenbiotech.com/role/SubsequentEvents 88 false false All Reports Book All Reports nkgn-20240630.htm nkgn-20240630.xsd nkgn-20240630_cal.xml nkgn-20240630_def.xml nkgn-20240630_lab.xml nkgn-20240630_pre.xml http://fasb.org/srt/2024 http://fasb.org/us-gaap/2024 http://xbrl.sec.gov/dei/2024 true true