3.21.2 html 99 242 1 false 23 0 false 6 false false R1.htm 100000 - Document - Document and Entity Information Sheet http://www.arcabiopharma.com/20210630/taxonomy/role/DocumentDocumentAndEntityInformation Document and Entity Information Cover 1 false false R2.htm 100010 - Statement - BALANCE SHEETS (Unaudited) Sheet http://www.arcabiopharma.com/20210630/taxonomy/role/StatementBALANCESHEETSUnaudited BALANCE SHEETS (Unaudited) Statements 2 false false R3.htm 100020 - Statement - BALANCE SHEETS (Unaudited) (Parenthetical) Sheet http://www.arcabiopharma.com/20210630/taxonomy/role/StatementBALANCESHEETSUnauditedParenthetical BALANCE SHEETS (Unaudited) (Parenthetical) Statements 3 false false R4.htm 100030 - Statement - STATEMENTS OF OPERATIONS (Unaudited) Sheet http://www.arcabiopharma.com/20210630/taxonomy/role/StatementSTATEMENTSOFOPERATIONSUnaudited STATEMENTS OF OPERATIONS (Unaudited) Statements 4 false false R5.htm 100040 - Statement - STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) Sheet http://www.arcabiopharma.com/20210630/taxonomy/role/StatementSTATEMENTSOFSTOCKHOLDERSEQUITYUnaudited STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) Statements 5 false false R6.htm 100050 - Statement - STATEMENTS OF CASH FLOWS (Unaudited) Sheet http://www.arcabiopharma.com/20210630/taxonomy/role/StatementSTATEMENTSOFCASHFLOWSUnaudited STATEMENTS OF CASH FLOWS (Unaudited) Statements 6 false false R7.htm 100060 - Disclosure - The Company and Summary of Significant Accounting Policies Sheet http://www.arcabiopharma.com/20210630/taxonomy/role/DisclosureTheCompanyAndSummaryOfSignificantAccountingPolicies The Company and Summary of Significant Accounting Policies Notes 7 false false R8.htm 100070 - Disclosure - Net Loss Per Share Sheet http://www.arcabiopharma.com/20210630/taxonomy/role/DisclosureNetLossPerShare Net Loss Per Share Notes 8 false false R9.htm 100080 - Disclosure - Fair Value Disclosures Sheet http://www.arcabiopharma.com/20210630/taxonomy/role/DisclosureFairValueDisclosures Fair Value Disclosures Notes 9 false false R10.htm 100090 - Disclosure - Property and Equipment Sheet http://www.arcabiopharma.com/20210630/taxonomy/role/DisclosurePropertyAndEquipment Property and Equipment Notes 10 false false R11.htm 100100 - Disclosure - Related Party Arrangements Sheet http://www.arcabiopharma.com/20210630/taxonomy/role/DisclosureRelatedPartyArrangements Related Party Arrangements Notes 11 false false R12.htm 100110 - Disclosure - Commitments and Contingencies Sheet http://www.arcabiopharma.com/20210630/taxonomy/role/DisclosureCommitmentsAndContingencies Commitments and Contingencies Notes 12 false false R13.htm 100120 - Disclosure - Equity Financings and Warrants Sheet http://www.arcabiopharma.com/20210630/taxonomy/role/DisclosureEquityFinancingsAndWarrants Equity Financings and Warrants Notes 13 false false R14.htm 100130 - Disclosure - Share-based Compensation Sheet http://www.arcabiopharma.com/20210630/taxonomy/role/DisclosureShareBasedCompensation Share-based Compensation Notes 14 false false R15.htm 100140 - Disclosure - Income Taxes Sheet http://www.arcabiopharma.com/20210630/taxonomy/role/DisclosureIncomeTaxes Income Taxes Notes 15 false false R16.htm 100150 - Disclosure - Subsequent Events Sheet http://www.arcabiopharma.com/20210630/taxonomy/role/DisclosureSubsequentEvents Subsequent Events Notes 16 false false R17.htm 100160 - Disclosure - The Company and Summary of Significant Accounting Policies (Policies) Sheet http://www.arcabiopharma.com/20210630/taxonomy/role/DisclosureTheCompanyAndSummaryOfSignificantAccountingPoliciesPolicies The Company and Summary of Significant Accounting Policies (Policies) Policies http://www.arcabiopharma.com/20210630/taxonomy/role/DisclosureTheCompanyAndSummaryOfSignificantAccountingPolicies 17 false false R18.htm 100170 - Disclosure - Net Loss Per Share (Tables) Sheet http://www.arcabiopharma.com/20210630/taxonomy/role/DisclosureNetLossPerShareTables Net Loss Per Share (Tables) Tables http://www.arcabiopharma.com/20210630/taxonomy/role/DisclosureNetLossPerShare 18 false false R19.htm 100180 - Disclosure - Property and Equipment (Tables) Sheet http://www.arcabiopharma.com/20210630/taxonomy/role/DisclosurePropertyAndEquipmentTables Property and Equipment (Tables) Tables http://www.arcabiopharma.com/20210630/taxonomy/role/DisclosurePropertyAndEquipment 19 false false R20.htm 100190 - Disclosure - Commitments and Contingencies (Tables) Sheet http://www.arcabiopharma.com/20210630/taxonomy/role/DisclosureCommitmentsAndContingenciesTables Commitments and Contingencies (Tables) Tables http://www.arcabiopharma.com/20210630/taxonomy/role/DisclosureCommitmentsAndContingencies 20 false false R21.htm 100200 - Disclosure - Equity Financings and Warrants (Tables) Sheet http://www.arcabiopharma.com/20210630/taxonomy/role/DisclosureEquityFinancingsAndWarrantsTables Equity Financings and Warrants (Tables) Tables http://www.arcabiopharma.com/20210630/taxonomy/role/DisclosureEquityFinancingsAndWarrants 21 false false R22.htm 100210 - Disclosure - Share-based Compensation (Tables) Sheet http://www.arcabiopharma.com/20210630/taxonomy/role/DisclosureShareBasedCompensationTables Share-based Compensation (Tables) Tables http://www.arcabiopharma.com/20210630/taxonomy/role/DisclosureShareBasedCompensation 22 false false R23.htm 100220 - Disclosure - The Company and Summary of Significant Accounting Policies (Details Textual) Sheet http://www.arcabiopharma.com/20210630/taxonomy/role/DisclosureTheCompanyAndSummaryOfSignificantAccountingPoliciesDetailsTextual The Company and Summary of Significant Accounting Policies (Details Textual) Details http://www.arcabiopharma.com/20210630/taxonomy/role/DisclosureTheCompanyAndSummaryOfSignificantAccountingPoliciesPolicies 23 false false R24.htm 100230 - Disclosure - Net Loss Per Share - Summary of Potentially Dilutive Shares of Common Stock (Details) Sheet http://www.arcabiopharma.com/20210630/taxonomy/role/DisclosureNetLossPerShareSummaryOfPotentiallyDilutiveSharesOfCommonStockDetails Net Loss Per Share - Summary of Potentially Dilutive Shares of Common Stock (Details) Details 24 false false R25.htm 100240 - Disclosure - Fair Value Disclosures (Details Textual) Sheet http://www.arcabiopharma.com/20210630/taxonomy/role/DisclosureFairValueDisclosuresDetailsTextual Fair Value Disclosures (Details Textual) Details http://www.arcabiopharma.com/20210630/taxonomy/role/DisclosureFairValueDisclosures 25 false false R26.htm 100250 - Disclosure - Property and Equipment - Summary of Property and Equipment (Details) Sheet http://www.arcabiopharma.com/20210630/taxonomy/role/DisclosurePropertyAndEquipmentSummaryOfPropertyAndEquipmentDetails Property and Equipment - Summary of Property and Equipment (Details) Details 26 false false R27.htm 100260 - Disclosure - Property and Equipment (Details Textual) Sheet http://www.arcabiopharma.com/20210630/taxonomy/role/DisclosurePropertyAndEquipmentDetailsTextual Property and Equipment (Details Textual) Details http://www.arcabiopharma.com/20210630/taxonomy/role/DisclosurePropertyAndEquipmentTables 27 false false R28.htm 100270 - Disclosure - Related Party Arrangements (Details Textual) Sheet http://www.arcabiopharma.com/20210630/taxonomy/role/DisclosureRelatedPartyArrangementsDetailsTextual Related Party Arrangements (Details Textual) Details http://www.arcabiopharma.com/20210630/taxonomy/role/DisclosureRelatedPartyArrangements 28 false false R29.htm 100280 - Disclosure - Commitments and Contingencies (Details Textual) Sheet http://www.arcabiopharma.com/20210630/taxonomy/role/DisclosureCommitmentsAndContingenciesDetailsTextual Commitments and Contingencies (Details Textual) Details http://www.arcabiopharma.com/20210630/taxonomy/role/DisclosureCommitmentsAndContingenciesTables 29 false false R30.htm 100290 - Disclosure - Commitments and Contingencies - Future Minimum Commitments due Under October 2020 and 2021 Lease Agreements (Details) Sheet http://www.arcabiopharma.com/20210630/taxonomy/role/DisclosureCommitmentsAndContingenciesFutureMinimumCommitmentsDueUnderOctober2020And2021LeaseAgreementsDetails Commitments and Contingencies - Future Minimum Commitments due Under October 2020 and 2021 Lease Agreements (Details) Details 30 false false R31.htm 100310 - Disclosure - Equity Financings and Warrants (Details Textual) Sheet http://www.arcabiopharma.com/20210630/taxonomy/role/DisclosureEquityFinancingsAndWarrantsDetailsTextual Equity Financings and Warrants (Details Textual) Details http://www.arcabiopharma.com/20210630/taxonomy/role/DisclosureEquityFinancingsAndWarrantsTables 31 false false R32.htm 100320 - Disclosure - Equity Financings and Warrants - Summary of Warrants by Year of Expiration (Details) Sheet http://www.arcabiopharma.com/20210630/taxonomy/role/DisclosureEquityFinancingsAndWarrantsSummaryOfWarrantsByYearOfExpirationDetails Equity Financings and Warrants - Summary of Warrants by Year of Expiration (Details) Details 32 false false R33.htm 100330 - Disclosure - Share-based Compensation - Summary of Non-cash, Share-based Compensation Expense (Details) Sheet http://www.arcabiopharma.com/20210630/taxonomy/role/DisclosureShareBasedCompensationSummaryOfNonCashShareBasedCompensationExpenseDetails Share-based Compensation - Summary of Non-cash, Share-based Compensation Expense (Details) Details 33 false false R34.htm 100340 - Disclosure - Share-based Compensation - Summary of Stock Option Activities (Details) Sheet http://www.arcabiopharma.com/20210630/taxonomy/role/DisclosureShareBasedCompensationSummaryOfStockOptionActivitiesDetails Share-based Compensation - Summary of Stock Option Activities (Details) Details 34 false false R35.htm 100350 - Disclosure - Income Taxes (Details Textual) Sheet http://www.arcabiopharma.com/20210630/taxonomy/role/DisclosureIncomeTaxesDetailsTextual Income Taxes (Details Textual) Details http://www.arcabiopharma.com/20210630/taxonomy/role/DisclosureIncomeTaxes 35 false false R36.htm 100360 - Disclosure - Subsequent Event (Details Textual) Sheet http://www.arcabiopharma.com/20210630/taxonomy/role/DisclosureSubsequentEventDetailsTextual Subsequent Event (Details Textual) Details http://www.arcabiopharma.com/20210630/taxonomy/role/DisclosureSubsequentEvents 36 false false All Reports Book All Reports abio-10q_20210630.htm abio-20210630.xsd abio-20210630_cal.xml abio-20210630_def.xml abio-20210630_lab.xml abio-20210630_pre.xml abio-ex103_140.htm abio-ex311_7.htm abio-ex312_9.htm abio-ex321_8.htm ghea21fx4dxn000001.jpg http://xbrl.sec.gov/dei/2020-01-31 http://fasb.org/us-gaap/2020-01-31 http://fasb.org/srt/2020-01-31 true true