3.22.2 html 151 210 1 false 45 0 false 9 false false R1.htm 100000 - Document - Document and Entity Information Sheet http://pepgen.com/20220630/taxonomy/role/DocumentDocumentAndEntityInformation Document and Entity Information Cover 1 false false R2.htm 100010 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) Sheet http://pepgen.com/20220630/taxonomy/role/StatementCondensedConsolidatedBalanceSheetsUnaudited CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) Statements 2 false false R3.htm 100030 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) Sheet http://pepgen.com/20220630/taxonomy/role/StatementCondensedConsolidatedStatementsOfOperationsUnaudited CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) Statements 3 false false R4.htm 100040 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (UNAUDITED) Sheet http://pepgen.com/20220630/taxonomy/role/StatementCondensedConsolidatedStatementsOfComprehensiveLossUnaudited CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (UNAUDITED) Statements 4 false false R5.htm 100050 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY (DEFICIT) (UNAUDITED) Sheet http://pepgen.com/20220630/taxonomy/role/StatementCondensedConsolidatedStatementsOfConvertiblePreferredStockAndStockholdersEquityDeficitUnaudited CONDENSED CONSOLIDATED STATEMENTS OF CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY (DEFICIT) (UNAUDITED) Statements 5 false false R6.htm 100060 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY (DEFICIT) (PARENTHETICAL) (UNAUDITED) Sheet http://pepgen.com/20220630/taxonomy/role/StatementCondensedConsolidatedStatementsOfConvertiblePreferredStockAndStockholdersEquityDeficitParentheticalUnaudited CONDENSED CONSOLIDATED STATEMENTS OF CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY (DEFICIT) (PARENTHETICAL) (UNAUDITED) Statements 6 false false R7.htm 100070 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) Sheet http://pepgen.com/20220630/taxonomy/role/StatementCondensedConsolidatedStatementsOfCashFlowsUnaudited CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) Statements 7 false false R8.htm 100080 - Disclosure - Nature of Business and Basis of Presentation Sheet http://pepgen.com/20220630/taxonomy/role/DisclosureNatureOfBusinessAndBasisOfPresentation1 Nature of Business and Basis of Presentation Notes 8 false false R9.htm 100090 - Disclosure - Summary of Significant Accounting Policies Sheet http://pepgen.com/20220630/taxonomy/role/DisclosureSummaryOfSignificantAccountingPolicies Summary of Significant Accounting Policies Notes 9 false false R10.htm 100100 - Disclosure - Fair Value Measurements Sheet http://pepgen.com/20220630/taxonomy/role/DisclosureFairValueMeasurements1 Fair Value Measurements Notes 10 false false R11.htm 100110 - Disclosure - Property and Equipment, Net Sheet http://pepgen.com/20220630/taxonomy/role/DisclosurePropertyAndEquipmentNet1 Property and Equipment, Net Notes 11 false false R12.htm 100120 - Disclosure - Accrued Expenses Sheet http://pepgen.com/20220630/taxonomy/role/DisclosureAccruedExpenses Accrued Expenses Notes 12 false false R13.htm 100130 - Disclosure - Related Party Transactions Sheet http://pepgen.com/20220630/taxonomy/role/DisclosureRelatedPartyTransactions Related Party Transactions Notes 13 false false R14.htm 100140 - Disclosure - Commitments and Contingencies Sheet http://pepgen.com/20220630/taxonomy/role/DisclosureCommitmentsAndContingencies1 Commitments and Contingencies Notes 14 false false R15.htm 100150 - Disclosure - Convertible Preferred Stock and Stockholders' Equity Sheet http://pepgen.com/20220630/taxonomy/role/DisclosureConvertiblePreferredStockAndStockholdersEquity1 Convertible Preferred Stock and Stockholders' Equity Notes 15 false false R16.htm 100160 - Disclosure - Stock-Based Compensation Sheet http://pepgen.com/20220630/taxonomy/role/DisclosureStockbasedCompensation1 Stock-Based Compensation Notes 16 false false R17.htm 100170 - Disclosure - Income Taxes Sheet http://pepgen.com/20220630/taxonomy/role/DisclosureIncomeTaxes Income Taxes Notes 17 false false R18.htm 100180 - Disclosure - Summary of Significant Accounting Policies (Policies) Sheet http://pepgen.com/20220630/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesPolicies Summary of Significant Accounting Policies (Policies) Policies http://pepgen.com/20220630/taxonomy/role/DisclosureSummaryOfSignificantAccountingPolicies 18 false false R19.htm 100190 - Disclosure - Fair Value Measurements (Tables) Sheet http://pepgen.com/20220630/taxonomy/role/DisclosureFairValueMeasurementsTables Fair Value Measurements (Tables) Tables http://pepgen.com/20220630/taxonomy/role/DisclosureFairValueMeasurements1 19 false false R20.htm 100200 - Disclosure - Property and Equipment, Net (Tables) Sheet http://pepgen.com/20220630/taxonomy/role/DisclosurePropertyAndEquipmentNetTables Property and Equipment, Net (Tables) Tables http://pepgen.com/20220630/taxonomy/role/DisclosurePropertyAndEquipmentNet1 20 false false R21.htm 100210 - Disclosure - Accrued Expenses (Tables) Sheet http://pepgen.com/20220630/taxonomy/role/DisclosureAccruedExpensesTables Accrued Expenses (Tables) Tables http://pepgen.com/20220630/taxonomy/role/DisclosureAccruedExpenses 21 false false R22.htm 100220 - Disclosure - Convertible Preferred Stock and Stockholders' Equity (Tables) Sheet http://pepgen.com/20220630/taxonomy/role/DisclosureConvertiblePreferredStockAndStockholdersEquityTables Convertible Preferred Stock and Stockholders' Equity (Tables) Tables http://pepgen.com/20220630/taxonomy/role/DisclosureConvertiblePreferredStockAndStockholdersEquity1 22 false false R23.htm 100230 - Disclosure - Stock-Based Compensation (Tables) Sheet http://pepgen.com/20220630/taxonomy/role/DisclosureStockbasedCompensationTables Stock-Based Compensation (Tables) Tables http://pepgen.com/20220630/taxonomy/role/DisclosureStockbasedCompensation1 23 false false R24.htm 100240 - Disclosure - Nature of Business and Basis of Presentation - Additional Information (Details) Sheet http://pepgen.com/20220630/taxonomy/role/DisclosureNatureOfBusinessAndBasisOfPresentationAdditionalInformationDetails Nature of Business and Basis of Presentation - Additional Information (Details) Details 24 false false R25.htm 100250 - Disclosure - Summary of Significant Accounting Policies (Additional Information) (Details) Sheet http://pepgen.com/20220630/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesAdditionalInformationDetails Summary of Significant Accounting Policies (Additional Information) (Details) Details http://pepgen.com/20220630/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesPolicies 25 false false R26.htm 100260 - Disclosure - Fair Value Measurements - Summary of Fair Value of Financial Assets Measure at Fair Value on Recurring Basis (Details) Sheet http://pepgen.com/20220630/taxonomy/role/DisclosureFairValueMeasurementsSummaryOfFairValueOfFinancialAssetsMeasureAtFairValueOnRecurringBasisDetails Fair Value Measurements - Summary of Fair Value of Financial Assets Measure at Fair Value on Recurring Basis (Details) Details 26 false false R27.htm 100270 - Disclosure - Fair Value Measurements - Additional Information (Details) Sheet http://pepgen.com/20220630/taxonomy/role/DisclosureFairValueMeasurementsAdditionalInformationDetails Fair Value Measurements - Additional Information (Details) Details 27 false false R28.htm 100280 - Disclosure - Fair Value Measurements - Summary of Reconciliation of Warrant Liabilities (Details) Sheet http://pepgen.com/20220630/taxonomy/role/DisclosureFairValueMeasurementsSummaryOfReconciliationOfWarrantLiabilitiesDetails Fair Value Measurements - Summary of Reconciliation of Warrant Liabilities (Details) Details 28 false false R29.htm 100290 - Disclosure - Property and Equipment, Net - Summary of Cost and Accumulated Depreciation of Property and Equipment (Details) Sheet http://pepgen.com/20220630/taxonomy/role/DisclosurePropertyAndEquipmentNetSummaryOfCostAndAccumulatedDepreciationOfPropertyAndEquipmentDetails Property and Equipment, Net - Summary of Cost and Accumulated Depreciation of Property and Equipment (Details) Details 29 false false R30.htm 100300 - Disclosure - Property and Equipment, Net - Additional Information (Details) Sheet http://pepgen.com/20220630/taxonomy/role/DisclosurePropertyAndEquipmentNetAdditionalInformationDetails Property and Equipment, Net - Additional Information (Details) Details 30 false false R31.htm 100310 - Disclosure - Accrued Expenses - Schedule of Accrued Expenses (Details) Sheet http://pepgen.com/20220630/taxonomy/role/DisclosureAccruedExpensesScheduleOfAccruedExpensesDetails Accrued Expenses - Schedule of Accrued Expenses (Details) Details 31 false false R32.htm 100320 - Disclosure - Related Party Transactions - Additional Information) (Details) Sheet http://pepgen.com/20220630/taxonomy/role/DisclosureRelatedPartyTransactionsAdditionalInformationDetails Related Party Transactions - Additional Information) (Details) Details 32 false false R33.htm 100330 - Disclosure - Commitments and Contingencies - Additional Information (Details) Sheet http://pepgen.com/20220630/taxonomy/role/DisclosureCommitmentsAndContingenciesAdditionalInformationDetails Commitments and Contingencies - Additional Information (Details) Details 33 false false R34.htm 100340 - Disclosure - Convertible Preferred Stock and Stockholders' Equity - Additional Information (Details) Sheet http://pepgen.com/20220630/taxonomy/role/DisclosureConvertiblePreferredStockAndStockholdersEquityAdditionalInformationDetails Convertible Preferred Stock and Stockholders' Equity - Additional Information (Details) Details 34 false false R35.htm 100350 - Disclosure - Convertible Preferred Stock and Stockholders' Equity - Schedule of Reserved Shares of Common Stock for Issuance, on an As-Converted Basis (Details) Sheet http://pepgen.com/20220630/taxonomy/role/DisclosureConvertiblePreferredStockAndStockholdersEquityScheduleOfReservedSharesOfCommonStockForIssuanceOnAnAsconvertedBasisDetails Convertible Preferred Stock and Stockholders' Equity - Schedule of Reserved Shares of Common Stock for Issuance, on an As-Converted Basis (Details) Details 35 false false R36.htm 100360 - Disclosure - Stock-Based Compensation - Additional Information (Details) Sheet http://pepgen.com/20220630/taxonomy/role/DisclosureStockbasedCompensationAdditionalInformationDetails Stock-Based Compensation - Additional Information (Details) Details 36 false false R37.htm 100370 - Disclosure - Stock-Based Compensation - Summary of Stock Options Activity (Details) Sheet http://pepgen.com/20220630/taxonomy/role/DisclosureStockbasedCompensationSummaryOfStockOptionsActivityDetails Stock-Based Compensation - Summary of Stock Options Activity (Details) Details 37 false false R38.htm 100380 - Disclosure - Stock-Based Compensation - Summary of Stock-based Compensation Expense (Details) Sheet http://pepgen.com/20220630/taxonomy/role/DisclosureStockbasedCompensationSummaryOfStockbasedCompensationExpenseDetails Stock-Based Compensation - Summary of Stock-based Compensation Expense (Details) Details 38 false false R39.htm 100390 - Disclosure - Income Taxes - Additional Information (Details) Sheet http://pepgen.com/20220630/taxonomy/role/DisclosureIncomeTaxesAdditionalInformationDetails Income Taxes - Additional Information (Details) Details 39 false false All Reports Book All Reports pepg-20220630.htm pepg-20220630.xsd pepg-20220630_cal.xml pepg-20220630_def.xml pepg-20220630_lab.xml pepg-20220630_pre.xml pepg-ex31_1.htm pepg-ex31_2.htm pepg-ex32_1.htm pepg-ex32_2.htm http://fasb.org/us-gaap/2022 http://xbrl.sec.gov/dei/2022 true true