3.21.2 html 126 312 1 true 38 0 false 5 false false R1.htm 100000 - Document - Document and Entity Information Sheet http://www.biomeafusion.com/20210930/taxonomy/role/DocumentDocumentAndEntityInformation Document and Entity Information Cover 1 false false R2.htm 100010 - Statement - Condensed Balance Sheets Sheet http://www.biomeafusion.com/20210930/taxonomy/role/StatementCondensedBalanceSheets Condensed Balance Sheets Statements 2 false false R3.htm 100020 - Statement - Condensed Balance Sheets (Parenthetical) Sheet http://www.biomeafusion.com/20210930/taxonomy/role/StatementCondensedBalanceSheetsParenthetical Condensed Balance Sheets (Parenthetical) Statements 3 false false R4.htm 100030 - Statement - Condensed Statements of Operations and Comprehensive Loss Sheet http://www.biomeafusion.com/20210930/taxonomy/role/StatementCondensedStatementsOfOperationsAndComprehensiveLoss Condensed Statements of Operations and Comprehensive Loss Statements 4 false false R5.htm 100040 - Statement - Condensed Statements of Convertible Preferred Stock and Stockholders' Equity (Deficit) Sheet http://www.biomeafusion.com/20210930/taxonomy/role/StatementCondensedStatementsOfConvertiblePreferredStockAndStockholdersEquityDeficit Condensed Statements of Convertible Preferred Stock and Stockholders' Equity (Deficit) Statements 5 false false R6.htm 100050 - Statement - Condensed Statements of Cash Flows Sheet http://www.biomeafusion.com/20210930/taxonomy/role/StatementCondensedStatementsOfCashFlows Condensed Statements of Cash Flows Statements 6 false false R7.htm 100060 - Disclosure - Organization Sheet http://www.biomeafusion.com/20210930/taxonomy/role/DisclosureOrganization Organization Notes 7 false false R8.htm 100070 - Disclosure - Summary of Significant Accounting Policies Sheet http://www.biomeafusion.com/20210930/taxonomy/role/DisclosureSummaryOfSignificantAccountingPolicies Summary of Significant Accounting Policies Notes 8 false false R9.htm 100080 - Disclosure - Fair Value Measurement Sheet http://www.biomeafusion.com/20210930/taxonomy/role/DisclosureFairValueMeasurement Fair Value Measurement Notes 9 false false R10.htm 100090 - Disclosure - Property and Equipment, Net Sheet http://www.biomeafusion.com/20210930/taxonomy/role/DisclosurePropertyAndEquipmentNet Property and Equipment, Net Notes 10 false false R11.htm 100100 - Disclosure - Leases Sheet http://www.biomeafusion.com/20210930/taxonomy/role/DisclosureLeases Leases Notes 11 false false R12.htm 100110 - Disclosure - Balance Sheet Components Sheet http://www.biomeafusion.com/20210930/taxonomy/role/DisclosureBalanceSheetComponents Balance Sheet Components Notes 12 false false R13.htm 100120 - Disclosure - Capital Structure Sheet http://www.biomeafusion.com/20210930/taxonomy/role/DisclosureCapitalStructure Capital Structure Notes 13 false false R14.htm 100130 - Disclosure - Stock-Based Compensation Sheet http://www.biomeafusion.com/20210930/taxonomy/role/DisclosureStockBasedCompensation Stock-Based Compensation Notes 14 false false R15.htm 100140 - Disclosure - Commitments and Contingencies Sheet http://www.biomeafusion.com/20210930/taxonomy/role/DisclosureCommitmentsAndContingencies Commitments and Contingencies Notes 15 false false R16.htm 100150 - Disclosure - Debt Sheet http://www.biomeafusion.com/20210930/taxonomy/role/DisclosureDebt Debt Notes 16 false false R17.htm 100160 - Disclosure - Related Party Transactions Sheet http://www.biomeafusion.com/20210930/taxonomy/role/DisclosureRelatedPartyTransactions Related Party Transactions Notes 17 false false R18.htm 100170 - Disclosure - Net Loss and Net Loss Per Share Sheet http://www.biomeafusion.com/20210930/taxonomy/role/DisclosureNetLossAndNetLossPerShare Net Loss and Net Loss Per Share Notes 18 false false R19.htm 100180 - Disclosure - Subsequent Events Sheet http://www.biomeafusion.com/20210930/taxonomy/role/DisclosureSubsequentEvents Subsequent Events Notes 19 false false R20.htm 100190 - Disclosure - Summary of Significant Accounting Policies (Policies) Sheet http://www.biomeafusion.com/20210930/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesPolicies Summary of Significant Accounting Policies (Policies) Policies http://www.biomeafusion.com/20210930/taxonomy/role/DisclosureSummaryOfSignificantAccountingPolicies 20 false false R21.htm 100200 - Disclosure - Summary of Significant Accounting Policies (Tables) Sheet http://www.biomeafusion.com/20210930/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesTables Summary of Significant Accounting Policies (Tables) Tables http://www.biomeafusion.com/20210930/taxonomy/role/DisclosureSummaryOfSignificantAccountingPolicies 21 false false R22.htm 100210 - Disclosure - Fair Value Measurement (Tables) Sheet http://www.biomeafusion.com/20210930/taxonomy/role/DisclosureFairValueMeasurementTables Fair Value Measurement (Tables) Tables http://www.biomeafusion.com/20210930/taxonomy/role/DisclosureFairValueMeasurement 22 false false R23.htm 100220 - Disclosure - Property and Equipment, Net (Tables) Sheet http://www.biomeafusion.com/20210930/taxonomy/role/DisclosurePropertyAndEquipmentNetTables Property and Equipment, Net (Tables) Tables http://www.biomeafusion.com/20210930/taxonomy/role/DisclosurePropertyAndEquipmentNet 23 false false R24.htm 100230 - Disclosure - Leases (Tables) Sheet http://www.biomeafusion.com/20210930/taxonomy/role/DisclosureLeasesTables Leases (Tables) Tables http://www.biomeafusion.com/20210930/taxonomy/role/DisclosureLeases 24 false false R25.htm 100240 - Disclosure - Balance Sheet Components (Tables) Sheet http://www.biomeafusion.com/20210930/taxonomy/role/DisclosureBalanceSheetComponentsTables Balance Sheet Components (Tables) Tables http://www.biomeafusion.com/20210930/taxonomy/role/DisclosureBalanceSheetComponents 25 false false R26.htm 100250 - Disclosure - Capital Structure (Tables) Sheet http://www.biomeafusion.com/20210930/taxonomy/role/DisclosureCapitalStructureTables Capital Structure (Tables) Tables http://www.biomeafusion.com/20210930/taxonomy/role/DisclosureCapitalStructure 26 false false R27.htm 100260 - Disclosure - Stock-Based Compensation (Tables) Sheet http://www.biomeafusion.com/20210930/taxonomy/role/DisclosureStockBasedCompensationTables Stock-Based Compensation (Tables) Tables http://www.biomeafusion.com/20210930/taxonomy/role/DisclosureStockBasedCompensation 27 false false R28.htm 100270 - Disclosure - Net Loss and Net Loss Per Share (Tables) Sheet http://www.biomeafusion.com/20210930/taxonomy/role/DisclosureNetLossAndNetLossPerShareTables Net Loss and Net Loss Per Share (Tables) Tables http://www.biomeafusion.com/20210930/taxonomy/role/DisclosureNetLossAndNetLossPerShare 28 false false R29.htm 100280 - Disclosure - Organization - Additional Information (Detail) Sheet http://www.biomeafusion.com/20210930/taxonomy/role/DisclosureOrganizationAdditionalInformationDetail Organization - Additional Information (Detail) Details 29 false false R30.htm 100290 - Disclosure - Summary of Significant Accounting Policies - Additional Information (Details) Sheet http://www.biomeafusion.com/20210930/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesAdditionalInformationDetails Summary of Significant Accounting Policies - Additional Information (Details) Details 30 false false R31.htm 100300 - Disclosure - Summary of Significant Accounting Policies - Summary of Useful Lives of Property and Equipment (Details) Sheet http://www.biomeafusion.com/20210930/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesSummaryOfUsefulLivesOfPropertyAndEquipmentDetails Summary of Significant Accounting Policies - Summary of Useful Lives of Property and Equipment (Details) Details 31 false false R32.htm 100310 - Disclosure - Fair Value Measurement - Additional Information (Details) Sheet http://www.biomeafusion.com/20210930/taxonomy/role/DisclosureFairValueMeasurementAdditionalInformationDetails Fair Value Measurement - Additional Information (Details) Details 32 false false R33.htm 100320 - Disclosure - Fair Value Measurement - Summary of Fair Value of Financial Assets Consist of Investments Measured and Recognized at Fair Value (Details) Sheet http://www.biomeafusion.com/20210930/taxonomy/role/DisclosureFairValueMeasurementSummaryOfFairValueOfFinancialAssetsConsistOfInvestmentsMeasuredAndRecognizedAtFairValueDetails Fair Value Measurement - Summary of Fair Value of Financial Assets Consist of Investments Measured and Recognized at Fair Value (Details) Details 33 false false R34.htm 100330 - Disclosure - Property and Equipment Net - Summary of Property and Equipment, Net (Details) Sheet http://www.biomeafusion.com/20210930/taxonomy/role/DisclosurePropertyAndEquipmentNetSummaryOfPropertyAndEquipmentNetDetails Property and Equipment Net - Summary of Property and Equipment, Net (Details) Details 34 false false R35.htm 100340 - Disclosure - Property and Equipment Net - Additional Information (Details) Sheet http://www.biomeafusion.com/20210930/taxonomy/role/DisclosurePropertyAndEquipmentNetAdditionalInformationDetails Property and Equipment Net - Additional Information (Details) Details 35 false false R36.htm 100350 - Disclosure - Leases - Additional Information (Details) Sheet http://www.biomeafusion.com/20210930/taxonomy/role/DisclosureLeasesAdditionalInformationDetails Leases - Additional Information (Details) Details 36 false false R37.htm 100360 - Disclosure - Leases - Schedule of Undiscounted Future Non-cancellable Lease Payments Under Operating Leases (Details) Sheet http://www.biomeafusion.com/20210930/taxonomy/role/DisclosureLeasesScheduleOfUndiscountedFutureNonCancellableLeasePaymentsUnderOperatingLeasesDetails Leases - Schedule of Undiscounted Future Non-cancellable Lease Payments Under Operating Leases (Details) Details 37 false false R38.htm 100380 - Disclosure - Balance Sheet Components - Summary of Prepaid Expenses and Other Current Assets (Details) Sheet http://www.biomeafusion.com/20210930/taxonomy/role/DisclosureBalanceSheetComponentsSummaryOfPrepaidExpensesAndOtherCurrentAssetsDetails Balance Sheet Components - Summary of Prepaid Expenses and Other Current Assets (Details) Details 38 false false R39.htm 100390 - Disclosure - Balance Sheet Components - Summary of Accrued Expense and Other Current Liabilities (Details) Sheet http://www.biomeafusion.com/20210930/taxonomy/role/DisclosureBalanceSheetComponentsSummaryOfAccruedExpenseAndOtherCurrentLiabilitiesDetails Balance Sheet Components - Summary of Accrued Expense and Other Current Liabilities (Details) Details 39 false false R40.htm 100400 - Disclosure - Capital Structure - Additional Information (Details) Sheet http://www.biomeafusion.com/20210930/taxonomy/role/DisclosureCapitalStructureAdditionalInformationDetails Capital Structure - Additional Information (Details) Details 40 false false R41.htm 100410 - Disclosure - Capital Structure - Schedule of Series A Convertible Preferred Stock (Details) Sheet http://www.biomeafusion.com/20210930/taxonomy/role/DisclosureCapitalStructureScheduleOfSeriesAConvertiblePreferredStockDetails Capital Structure - Schedule of Series A Convertible Preferred Stock (Details) Details 41 false false R42.htm 100420 - Disclosure - Stock-Based Compensation - Additional Information (Details) Sheet http://www.biomeafusion.com/20210930/taxonomy/role/DisclosureStockBasedCompensationAdditionalInformationDetails Stock-Based Compensation - Additional Information (Details) Details 42 false false R43.htm 100430 - Disclosure - Stock-Based Compensation - Summary of Stock-Based Compensation Expense Recorded in Condensed Statements of Operations and Allocated (Details) Sheet http://www.biomeafusion.com/20210930/taxonomy/role/DisclosureStockBasedCompensationSummaryOfStockBasedCompensationExpenseRecordedInCondensedStatementsOfOperationsAndAllocatedDetails Stock-Based Compensation - Summary of Stock-Based Compensation Expense Recorded in Condensed Statements of Operations and Allocated (Details) Details 43 false false R44.htm 100440 - Disclosure - Stock-Based Compensation - Summary of Stock Option Activity (Details) Sheet http://www.biomeafusion.com/20210930/taxonomy/role/DisclosureStockBasedCompensationSummaryOfStockOptionActivityDetails Stock-Based Compensation - Summary of Stock Option Activity (Details) Details 44 false false R45.htm 100450 - Disclosure - Stock-Based Compensation - Summary of Fair Value of Stock Options Estimated using Weighted-Average Assumptions (Details) Sheet http://www.biomeafusion.com/20210930/taxonomy/role/DisclosureStockBasedCompensationSummaryOfFairValueOfStockOptionsEstimatedUsingWeightedAverageAssumptionsDetails Stock-Based Compensation - Summary of Fair Value of Stock Options Estimated using Weighted-Average Assumptions (Details) Details 45 false false R46.htm 100460 - Disclosure - Debt - Additional Information (Details) Sheet http://www.biomeafusion.com/20210930/taxonomy/role/DisclosureDebtAdditionalInformationDetails Debt - Additional Information (Details) Details 46 false false R47.htm 100470 - Disclosure - Related Party Transactions - Additional Information (Details) Sheet http://www.biomeafusion.com/20210930/taxonomy/role/DisclosureRelatedPartyTransactionsAdditionalInformationDetails Related Party Transactions - Additional Information (Details) Details 47 false false R48.htm 100480 - Disclosure - Net Loss and Net Loss Per Share - Summary of Computation of Basic and Diluted Net Loss Per Share (Details) Sheet http://www.biomeafusion.com/20210930/taxonomy/role/DisclosureNetLossAndNetLossPerShareSummaryOfComputationOfBasicAndDilutedNetLossPerShareDetails Net Loss and Net Loss Per Share - Summary of Computation of Basic and Diluted Net Loss Per Share (Details) Details 48 false false All Reports Book All Reports bmea-10q_20210930.htm bmea-20210930.xsd bmea-20210930_cal.xml bmea-20210930_def.xml bmea-20210930_lab.xml bmea-20210930_pre.xml bmea-ex311_8.htm bmea-ex312_10.htm bmea-ex321_7.htm bmea-ex322_6.htm http://xbrl.sec.gov/dei/2021 http://xbrl.sec.gov/stpr/2021 http://fasb.org/srt/2021-01-31 http://fasb.org/us-gaap/2021-01-31 true true