3.23.1 html 111 201 1 false 32 0 false 4 false false R1.htm 100000 - Document - Document and Entity Information Sheet http://www.cogentbio.com/20230331/taxonomy/role/Role_DocumentDocumentAndEntityInformation Document and Entity Information Cover 1 false false R2.htm 100010 - Statement - Condensed Consolidated Balance Sheets Sheet http://www.cogentbio.com/20230331/taxonomy/role/Role_StatementCondensedConsolidatedBalanceSheets Condensed Consolidated Balance Sheets Statements 2 false false R3.htm 100020 - Statement - Condensed Consolidated Balance Sheets (Parenthetical) Sheet http://www.cogentbio.com/20230331/taxonomy/role/Role_StatementCondensedConsolidatedBalanceSheetsParenthetical Condensed Consolidated Balance Sheets (Parenthetical) Statements 3 false false R4.htm 100030 - Statement - Condensed Consolidated Statements of Operations and Comprehensive Loss Sheet http://www.cogentbio.com/20230331/taxonomy/role/Role_StatementCondensedConsolidatedStatementsOfOperationsAndComprehensiveLoss Condensed Consolidated Statements of Operations and Comprehensive Loss Statements 4 false false R5.htm 100040 - Statement - Condensed Consolidated Statements of Stockholders' Equity Sheet http://www.cogentbio.com/20230331/taxonomy/role/Role_StatementCondensedConsolidatedStatementsOfStockholdersEquity Condensed Consolidated Statements of Stockholders' Equity Statements 5 false false R6.htm 100050 - Statement - Condensed Consolidated Statements of Cash Flows Sheet http://www.cogentbio.com/20230331/taxonomy/role/Role_StatementCondensedConsolidatedStatementsOfCashFlows Condensed Consolidated Statements of Cash Flows Statements 6 false false R7.htm 100060 - Disclosure - Nature of the Business and Basis of Presentation Sheet http://www.cogentbio.com/20230331/taxonomy/role/Role_DisclosureNatureOfBusinessAndBasisOfPresentation Nature of the Business and Basis of Presentation Notes 7 false false R8.htm 100070 - Disclosure - Summary of Significant Accounting Policies Sheet http://www.cogentbio.com/20230331/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPolicies Summary of Significant Accounting Policies Notes 8 false false R9.htm 100080 - Disclosure - Marketable Securities and Fair Value of Financial Assets and Liabilities Sheet http://www.cogentbio.com/20230331/taxonomy/role/DisclosureMarketableSecuritiesAndFairValueOfFinancialAssetsAndLiabilities1 Marketable Securities and Fair Value of Financial Assets and Liabilities Notes 9 false false R10.htm 100090 - Disclosure - Accrued Expenses and Other Current Liabilities Sheet http://www.cogentbio.com/20230331/taxonomy/role/Role_DisclosureAccruedExpensesAndOtherCurrentLiabilities Accrued Expenses and Other Current Liabilities Notes 10 false false R11.htm 100100 - Disclosure - Preferred Stock, Series A Non-Voting Convertible Preferred Stock and Common Stock Sheet http://www.cogentbio.com/20230331/taxonomy/role/Role_DisclosurePreferredStockSeriesANonVotingConvertiblePreferredStockAndCommonStock Preferred Stock, Series A Non-Voting Convertible Preferred Stock and Common Stock Notes 11 false false R12.htm 100110 - Disclosure - Stock-Based Compensation Sheet http://www.cogentbio.com/20230331/taxonomy/role/Role_DisclosureStockBasedCompensation Stock-Based Compensation Notes 12 false false R13.htm 100120 - Disclosure - Commitments and Contingencies Sheet http://www.cogentbio.com/20230331/taxonomy/role/Role_DisclosureCommitmentsAndContingencies Commitments and Contingencies Notes 13 false false R14.htm 100130 - Disclosure - Net Loss Per Share Sheet http://www.cogentbio.com/20230331/taxonomy/role/Role_DisclosureNetLossPerShare Net Loss Per Share Notes 14 false false R15.htm 100140 - Disclosure - Retirement Plan Sheet http://www.cogentbio.com/20230331/taxonomy/role/Role_DisclosureRetirementPlan Retirement Plan Notes 15 false false R16.htm 100150 - Disclosure - Summary of Significant Accounting Policies (Policies) Sheet http://www.cogentbio.com/20230331/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPoliciesPolicies Summary of Significant Accounting Policies (Policies) Policies http://www.cogentbio.com/20230331/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPolicies 16 false false R17.htm 100160 - Disclosure - Marketable Securities and Fair Value of Financial Assets and Liabilities (Tables) Sheet http://www.cogentbio.com/20230331/taxonomy/role/DisclosureMarketableSecuritiesAndFairValueOfFinancialAssetsAndLiabilitiesTables Marketable Securities and Fair Value of Financial Assets and Liabilities (Tables) Tables http://www.cogentbio.com/20230331/taxonomy/role/DisclosureMarketableSecuritiesAndFairValueOfFinancialAssetsAndLiabilities1 17 false false R18.htm 100170 - Disclosure - Accrued Expenses and Other Current Liabilities (Tables) Sheet http://www.cogentbio.com/20230331/taxonomy/role/Role_DisclosureAccruedExpensesAndOtherCurrentLiabilitiesTables Accrued Expenses and Other Current Liabilities (Tables) Tables http://www.cogentbio.com/20230331/taxonomy/role/Role_DisclosureAccruedExpensesAndOtherCurrentLiabilities 18 false false R19.htm 100180 - Disclosure - Stock-Based Compensation (Tables) Sheet http://www.cogentbio.com/20230331/taxonomy/role/Role_DisclosureStockBasedCompensationTables Stock-Based Compensation (Tables) Tables http://www.cogentbio.com/20230331/taxonomy/role/Role_DisclosureStockBasedCompensation 19 false false R20.htm 100190 - Disclosure - Net Loss per Share (Tables) Sheet http://www.cogentbio.com/20230331/taxonomy/role/Role_DisclosureNetLossPerShareTables Net Loss per Share (Tables) Tables 20 false false R21.htm 100200 - Disclosure - Nature of the Business and Basis of Presentation - Additional Information (Detail) Sheet http://www.cogentbio.com/20230331/taxonomy/role/Role_DisclosureNatureOfBusinessAndBasisOfPresentationAdditionalInformationDetail Nature of the Business and Basis of Presentation - Additional Information (Detail) Details 21 false false R22.htm 100210 - Disclosure - Marketable Securities and Fair Value of Financial Assets and Liabilities - Summary of Marketable Securities (Details) Sheet http://www.cogentbio.com/20230331/taxonomy/role/DisclosureMarketableSecuritiesAndFairValueOfFinancialAssetsAndLiabilitiesSummaryOfMarketableSecuritiesDetails Marketable Securities and Fair Value of Financial Assets and Liabilities - Summary of Marketable Securities (Details) Details 22 false false R23.htm 100220 - Disclosure - Marketable Securities and Fair Value of Financial Assets and Liabilities - Schedule of Financial Assets and Liabilities at Fair Value on Recurring Basis (Detail) Sheet http://www.cogentbio.com/20230331/taxonomy/role/DisclosureMarketableSecuritiesAndFairValueOfFinancialAssetsAndLiabilitiesScheduleOfFinancialAssetsAndLiabilitiesAtFairValueOnRecurringBa Marketable Securities and Fair Value of Financial Assets and Liabilities - Schedule of Financial Assets and Liabilities at Fair Value on Recurring Basis (Detail) Details 23 false false R24.htm 100230 - Disclosure - Marketable Securities and Fair Value of Financial Assets and Liabilities - Additional Information (Detail) Sheet http://www.cogentbio.com/20230331/taxonomy/role/DisclosureMarketableSecuritiesAndFairValueOfFinancialAssetsAndLiabilitiesAdditionalInformationDetail Marketable Securities and Fair Value of Financial Assets and Liabilities - Additional Information (Detail) Details 24 false false R25.htm 100240 - Disclosure - Marketable Securities and Fair Value of Financial Assets and Liabilities - Summary of Changes in the Fair Value of Company's CVR Liability (Detail) Sheet http://www.cogentbio.com/20230331/taxonomy/role/DisclosureMarketableSecuritiesAndFairValueOfFinancialAssetsAndLiabilitiesSummaryOfChangesInTheFairValueOfCompanysCvrLiabilityDetail Marketable Securities and Fair Value of Financial Assets and Liabilities - Summary of Changes in the Fair Value of Company's CVR Liability (Detail) Details 25 false false R26.htm 100250 - Disclosure - Accrued Expenses and Other Current Liabilities - Schedule of Accrued Expenses and Other Current Liabilities (Detail) Sheet http://www.cogentbio.com/20230331/taxonomy/role/Role_DisclosureAccruedExpensesAndOtherCurrentLiabilitiesScheduleOfAccruedExpensesAndOtherCurrentLiabilitiesDetail Accrued Expenses and Other Current Liabilities - Schedule of Accrued Expenses and Other Current Liabilities (Detail) Details 26 false false R27.htm 100260 - Disclosure - Preferred Stock, Series A Non-Voting Convertible Preferred Stock and Common Stock - Additional Information (Detail) Sheet http://www.cogentbio.com/20230331/taxonomy/role/Role_DisclosurePreferredStockSeriesANonVotingConvertiblePreferredStockAndCommonStockAdditionalInformationDetail Preferred Stock, Series A Non-Voting Convertible Preferred Stock and Common Stock - Additional Information (Detail) Details 27 false false R28.htm 100270 - Disclosure - Stock-Based Compensation - Additional Information (Detail) Sheet http://www.cogentbio.com/20230331/taxonomy/role/Role_DisclosureStockBasedCompensationAdditionalInformationDetail Stock-Based Compensation - Additional Information (Detail) Details 28 false false R29.htm 100280 - Disclosure - Stock-Based Compensation - Schedule of Stock Based Compensation Expense (Detail) Sheet http://www.cogentbio.com/20230331/taxonomy/role/Role_DisclosureStockBasedCompensationScheduleOfStockBasedCompensationExpenseDetail Stock-Based Compensation - Schedule of Stock Based Compensation Expense (Detail) Details 29 false false R30.htm 100290 - Disclosure - Commitments and Contingencies - Additional Information (Detail) Sheet http://www.cogentbio.com/20230331/taxonomy/role/Role_DisclosureCommitmentsAndContingenciesAdditionalInformationDetail Commitments and Contingencies - Additional Information (Detail) Details 30 false false R31.htm 100300 - Disclosure - Net Loss Per Share - Schedule of Earnings Per Share Basic and Diluted (Detail) Sheet http://www.cogentbio.com/20230331/taxonomy/role/Role_DisclosureNetLossPerShareScheduleOfEarningsPerShareBasicAndDilutedDetail Net Loss Per Share - Schedule of Earnings Per Share Basic and Diluted (Detail) Details 31 false false R32.htm 100310 - Disclosure - Net Loss Per Share - Summary of Potential Dilutive Securities (Detail) Sheet http://www.cogentbio.com/20230331/taxonomy/role/Role_DisclosureNetLossPerShareSummaryOfPotentialDilutiveSecuritiesDetail Net Loss Per Share - Summary of Potential Dilutive Securities (Detail) Details 32 false false R33.htm 100320 - Disclosure - Net Loss Per Share - Additional Information (Details) Sheet http://www.cogentbio.com/20230331/taxonomy/role/DisclosureNetLossPerShareAdditionalInformationDetails Net Loss Per Share - Additional Information (Details) Details 33 false false R34.htm 100330 - Disclosure - Retirement Plan - Additional Information (Detail) Sheet http://www.cogentbio.com/20230331/taxonomy/role/Role_DisclosureRetirementPlanAdditionalInformationDetail Retirement Plan - Additional Information (Detail) Details 34 false false All Reports Book All Reports cogt-20230331.htm cogt-20230331.xsd cogt-20230331_cal.xml cogt-20230331_def.xml cogt-20230331_lab.xml cogt-20230331_pre.xml cogt-ex31_1.htm cogt-ex31_2.htm cogt-ex32_1.htm cogt-ex32_2.htm img157441556_0.jpg http://fasb.org/us-gaap/2022 http://xbrl.sec.gov/dei/2022 true true