3.26.1 html 198 328 2 false 43 0 false 10 false false R1.htm 100090 - Document - Document and Entity Information Sheet http://www.nextcure.com/role/DocumentDocumentAndEntityInformation Document and Entity Information Cover 1 false false R2.htm 100100 - Statement - CONDENSED BALANCE SHEETS Sheet http://www.nextcure.com/role/StatementCondensedBalanceSheets CONDENSED BALANCE SHEETS Statements 2 false false R3.htm 100105 - Statement - CONDENSED BALANCE SHEETS (Parenthetical) Sheet http://www.nextcure.com/role/StatementCondensedBalanceSheetsParenthetical CONDENSED BALANCE SHEETS (Parenthetical) Statements 3 false false R4.htm 100200 - Statement - CONDENSED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS Sheet http://www.nextcure.com/role/StatementCondensedStatementsOfOperationsAndComprehensiveLoss CONDENSED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS Statements 4 false false R5.htm 100300 - Statement - CONDENSED STATEMENTS OF STOCKHOLDERS' EQUITY Sheet http://www.nextcure.com/role/StatementCondensedStatementsOfStockholdersEquity CONDENSED STATEMENTS OF STOCKHOLDERS' EQUITY Statements 5 false false R6.htm 100305 - Statement - CONDENSED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) Sheet http://www.nextcure.com/role/StatementCondensedStatementsOfStockholdersEquityParenthetical CONDENSED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) Statements 6 false false R7.htm 100400 - Statement - CONDENSED STATEMENTS OF CASH FLOWS Sheet http://www.nextcure.com/role/StatementCondensedStatementsOfCashFlows CONDENSED STATEMENTS OF CASH FLOWS Statements 7 false false R8.htm 100405 - Statement - CONDENSED STATEMENTS OF CASH FLOWS (Parenthetical) Sheet http://www.nextcure.com/role/StatementCondensedStatementsOfCashFlowsParenthetical CONDENSED STATEMENTS OF CASH FLOWS (Parenthetical) Statements 8 false false R9.htm 110101 - Disclosure - Nature of the Business and Basis of Presentation Sheet http://www.nextcure.com/role/DisclosureNatureOfBusinessAndBasisOfPresentation Nature of the Business and Basis of Presentation Notes 9 false false R10.htm 110201 - Disclosure - Summary of Significant Accounting Policies Sheet http://www.nextcure.com/role/DisclosureSummaryOfSignificantAccountingPolicies Summary of Significant Accounting Policies Notes 10 false false R11.htm 110301 - Disclosure - License Agreement Sheet http://www.nextcure.com/role/DisclosureLicenseAgreement License Agreement Notes 11 false false R12.htm 110401 - Disclosure - Collaboration Agreement Sheet http://www.nextcure.com/role/DisclosureCollaborationAgreement Collaboration Agreement Notes 12 false false R13.htm 110501 - Disclosure - Marketable Securities Sheet http://www.nextcure.com/role/DisclosureMarketableSecurities Marketable Securities Notes 13 false false R14.htm 110601 - Disclosure - Fair Value Measurements Sheet http://www.nextcure.com/role/DisclosureFairValueMeasurements Fair Value Measurements Notes 14 false false R15.htm 110701 - Disclosure - Property and Equipment, Net Sheet http://www.nextcure.com/role/DisclosurePropertyAndEquipmentNet Property and Equipment, Net Notes 15 false false R16.htm 110801 - Disclosure - Accrued Liabilities and Other Liabilities Sheet http://www.nextcure.com/role/DisclosureAccruedLiabilitiesAndOtherLiabilities Accrued Liabilities and Other Liabilities Notes 16 false false R17.htm 110901 - Disclosure - Leases Sheet http://www.nextcure.com/role/DisclosureLeases Leases Notes 17 false false R18.htm 111001 - Disclosure - Commitments and Contingencies Sheet http://www.nextcure.com/role/DisclosureCommitmentsAndContingencies Commitments and Contingencies Notes 18 false false R19.htm 111101 - Disclosure - Preferred Stock Sheet http://www.nextcure.com/role/DisclosurePreferredStock Preferred Stock Notes 19 false false R20.htm 111201 - Disclosure - Common Stock Sheet http://www.nextcure.com/role/DisclosureCommonStock Common Stock Notes 20 false false R21.htm 111301 - Disclosure - Stock-Based Compensation Sheet http://www.nextcure.com/role/DisclosureStockBasedCompensation Stock-Based Compensation Notes 21 false false R22.htm 111401 - Disclosure - Restructuring and Asset Impairment Sheet http://www.nextcure.com/role/DisclosureRestructuringAndAssetImpairment Restructuring and Asset Impairment Notes 22 false false R23.htm 111501 - Disclosure - Segment Information Sheet http://www.nextcure.com/role/DisclosureSegmentInformation Segment Information Notes 23 false false R24.htm 111601 - Disclosure - Net Loss per Share Attributable to Common Stockholders Sheet http://www.nextcure.com/role/DisclosureNetLossPerShareAttributableToCommonStockholders Net Loss per Share Attributable to Common Stockholders Notes 24 false false R25.htm 111701 - Disclosure - Income Taxes Sheet http://www.nextcure.com/role/DisclosureIncomeTaxes Income Taxes Notes 25 false false R26.htm 111801 - Disclosure - Employee Benefit Plan Sheet http://www.nextcure.com/role/DisclosureEmployeeBenefitPlan Employee Benefit Plan Notes 26 false false R27.htm 111901 - Disclosure - Subsequent Events Sheet http://www.nextcure.com/role/DisclosureSubsequentEvents Subsequent Events Notes 27 false false R28.htm 120202 - Disclosure - Summary of Significant Accounting Policies (Policies) Sheet http://www.nextcure.com/role/DisclosureSummaryOfSignificantAccountingPoliciesPolicies Summary of Significant Accounting Policies (Policies) Policies http://www.nextcure.com/role/DisclosureSummaryOfSignificantAccountingPolicies 28 false false R29.htm 130203 - Disclosure - Summary of Significant Accounting Policies (Tables) Sheet http://www.nextcure.com/role/DisclosureSummaryOfSignificantAccountingPoliciesTables Summary of Significant Accounting Policies (Tables) Tables http://www.nextcure.com/role/DisclosureSummaryOfSignificantAccountingPolicies 29 false false R30.htm 130503 - Disclosure - Marketable Securities (Tables) Sheet http://www.nextcure.com/role/DisclosureMarketableSecuritiesTables Marketable Securities (Tables) Tables http://www.nextcure.com/role/DisclosureMarketableSecurities 30 false false R31.htm 130603 - Disclosure - Fair Value Measurements (Tables) Sheet http://www.nextcure.com/role/DisclosureFairValueMeasurementsTables Fair Value Measurements (Tables) Tables http://www.nextcure.com/role/DisclosureFairValueMeasurements 31 false false R32.htm 130703 - Disclosure - Property and Equipment, Net (Tables) Sheet http://www.nextcure.com/role/DisclosurePropertyAndEquipmentNetTables Property and Equipment, Net (Tables) Tables http://www.nextcure.com/role/DisclosurePropertyAndEquipmentNet 32 false false R33.htm 130803 - Disclosure - Accrued Liabilities and Other Liabilities (Tables) Sheet http://www.nextcure.com/role/DisclosureAccruedLiabilitiesAndOtherLiabilitiesTables Accrued Liabilities and Other Liabilities (Tables) Tables http://www.nextcure.com/role/DisclosureAccruedLiabilitiesAndOtherLiabilities 33 false false R34.htm 130903 - Disclosure - Leases (Tables) Sheet http://www.nextcure.com/role/DisclosureLeasesTables Leases (Tables) Tables http://www.nextcure.com/role/DisclosureLeases 34 false false R35.htm 131303 - Disclosure - Stock-Based Compensation (Tables) Sheet http://www.nextcure.com/role/DisclosureStockBasedCompensationTables Stock-Based Compensation (Tables) Tables http://www.nextcure.com/role/DisclosureStockBasedCompensation 35 false false R36.htm 131503 - Disclosure - Segment Information (Tables) Sheet http://www.nextcure.com/role/DisclosureSegmentInformationTables Segment Information (Tables) Tables http://www.nextcure.com/role/DisclosureSegmentInformation 36 false false R37.htm 131603 - Disclosure - Net Loss per Share Attributable to Common Stockholders (Tables) Sheet http://www.nextcure.com/role/DisclosureNetLossPerShareAttributableToCommonStockholdersTables Net Loss per Share Attributable to Common Stockholders (Tables) Tables http://www.nextcure.com/role/DisclosureNetLossPerShareAttributableToCommonStockholders 37 false false R38.htm 131703 - Disclosure - Income Taxes (Tables) Sheet http://www.nextcure.com/role/DisclosureIncomeTaxesTables Income Taxes (Tables) Tables http://www.nextcure.com/role/DisclosureIncomeTaxes 38 false false R39.htm 140101 - Disclosure - Nature of the Business and Basis of Presentation - Public Offerings and Common Stock (Details) Sheet http://www.nextcure.com/role/DisclosureNatureOfBusinessAndBasisOfPresentationPublicOfferingsAndCommonStockDetails Nature of the Business and Basis of Presentation - Public Offerings and Common Stock (Details) Details 39 false false R40.htm 140201 - Disclosure - Summary of Significant Accounting Policies - Property and Equipment and Leases (Details) Sheet http://www.nextcure.com/role/DisclosureSummaryOfSignificantAccountingPoliciesPropertyAndEquipmentAndLeasesDetails Summary of Significant Accounting Policies - Property and Equipment and Leases (Details) Details 40 false false R41.htm 140202 - Disclosure - Summary of Significant Accounting Policies - Additional Information (Details) Sheet http://www.nextcure.com/role/DisclosureSummaryOfSignificantAccountingPoliciesAdditionalInformationDetails Summary of Significant Accounting Policies - Additional Information (Details) Details 41 false false R42.htm 140301 - Disclosure - License Agreement (Details) Sheet http://www.nextcure.com/role/DisclosureLicenseAgreementDetails License Agreement (Details) Details http://www.nextcure.com/role/DisclosureLicenseAgreement 42 false false R43.htm 140401 - Disclosure - Collaboration Agreement (Details) Sheet http://www.nextcure.com/role/DisclosureCollaborationAgreementDetails Collaboration Agreement (Details) Details http://www.nextcure.com/role/DisclosureCollaborationAgreement 43 false false R44.htm 140501 - Disclosure - Marketable Securities (Details) Sheet http://www.nextcure.com/role/DisclosureMarketableSecuritiesDetails Marketable Securities (Details) Details http://www.nextcure.com/role/DisclosureMarketableSecuritiesTables 44 false false R45.htm 140601 - Disclosure - Fair Value Measurements (Details) Sheet http://www.nextcure.com/role/DisclosureFairValueMeasurementsDetails Fair Value Measurements (Details) Details http://www.nextcure.com/role/DisclosureFairValueMeasurementsTables 45 false false R46.htm 140701 - Disclosure - Property and Equipment, Net (Details) Sheet http://www.nextcure.com/role/DisclosurePropertyAndEquipmentNetDetails Property and Equipment, Net (Details) Details http://www.nextcure.com/role/DisclosurePropertyAndEquipmentNetTables 46 false false R47.htm 140801 - Disclosure - Accrued Liabilities and Other Liabilities (Details) Sheet http://www.nextcure.com/role/DisclosureAccruedLiabilitiesAndOtherLiabilitiesDetails Accrued Liabilities and Other Liabilities (Details) Details http://www.nextcure.com/role/DisclosureAccruedLiabilitiesAndOtherLiabilitiesTables 47 false false R48.htm 140901 - Disclosure - Leases - Other Information (Details) Sheet http://www.nextcure.com/role/DisclosureLeasesOtherInformationDetails Leases - Other Information (Details) Details 48 false false R49.htm 140902 - Disclosure - Leases - Maturities (Details) Sheet http://www.nextcure.com/role/DisclosureLeasesMaturitiesDetails Leases - Maturities (Details) Details 49 false false R50.htm 141101 - Disclosure - Preferred Stock (Details) Sheet http://www.nextcure.com/role/DisclosurePreferredStockDetails Preferred Stock (Details) Details http://www.nextcure.com/role/DisclosurePreferredStock 50 false false R51.htm 141201 - Disclosure - Common Stock (Details) Sheet http://www.nextcure.com/role/DisclosureCommonStockDetails Common Stock (Details) Details http://www.nextcure.com/role/DisclosureCommonStock 51 false false R52.htm 141202 - Disclosure - Common Stock - Securities Purchase Agreement and Pre-Funded Warrants (Details) Sheet http://www.nextcure.com/role/DisclosureCommonStockSecuritiesPurchaseAgreementAndPreFundedWarrantsDetails Common Stock - Securities Purchase Agreement and Pre-Funded Warrants (Details) Details 52 false false R53.htm 141301 - Disclosure - Stock-Based Compensation - Stock options (Details) Sheet http://www.nextcure.com/role/DisclosureStockBasedCompensationStockOptionsDetails Stock-Based Compensation - Stock options (Details) Details 53 false false R54.htm 141302 - Disclosure - Stock-Based Compensation - Stock based compensation expense (Details) Sheet http://www.nextcure.com/role/DisclosureStockBasedCompensationStockBasedCompensationExpenseDetails Stock-Based Compensation - Stock based compensation expense (Details) Details 54 false false R55.htm 141303 - Disclosure - Stock-Based Compensation - Assumptions (Details) Sheet http://www.nextcure.com/role/DisclosureStockBasedCompensationAssumptionsDetails Stock-Based Compensation - Assumptions (Details) Details 55 false false R56.htm 141401 - Disclosure - Restructuring and Asset Impairment (Details) Sheet http://www.nextcure.com/role/DisclosureRestructuringAndAssetImpairmentDetails Restructuring and Asset Impairment (Details) Details http://www.nextcure.com/role/DisclosureRestructuringAndAssetImpairment 56 false false R57.htm 141501 - Disclosure - Segment Information - Other Information (Details) Sheet http://www.nextcure.com/role/DisclosureSegmentInformationOtherInformationDetails Segment Information - Other Information (Details) Details 57 false false R58.htm 141502 - Disclosure - Segment Information - Significant expense categories (Details) Sheet http://www.nextcure.com/role/DisclosureSegmentInformationSignificantExpenseCategoriesDetails Segment Information - Significant expense categories (Details) Details 58 false false R59.htm 141601 - Disclosure - Net Loss per Share Attributable to Common Stockholders - Anti-dilutive effect (Details) Sheet http://www.nextcure.com/role/DisclosureNetLossPerShareAttributableToCommonStockholdersAntiDilutiveEffectDetails Net Loss per Share Attributable to Common Stockholders - Anti-dilutive effect (Details) Details 59 false false R60.htm 141701 - Disclosure - Income Taxes - Reconciliation (Details) Sheet http://www.nextcure.com/role/DisclosureIncomeTaxesReconciliationDetails Income Taxes - Reconciliation (Details) Details 60 false false R61.htm 141702 - Disclosure - Income Taxes - Deferred tax assets (Details) Sheet http://www.nextcure.com/role/DisclosureIncomeTaxesDeferredTaxAssetsDetails Income Taxes - Deferred tax assets (Details) Details 61 false false R62.htm 141801 - Disclosure - Employee Benefit Plan (Details) Sheet http://www.nextcure.com/role/DisclosureEmployeeBenefitPlanDetails Employee Benefit Plan (Details) Details http://www.nextcure.com/role/DisclosureEmployeeBenefitPlan 62 false false R63.htm 141901 - Disclosure - Subsequent Events (Details) Sheet http://www.nextcure.com/role/DisclosureSubsequentEventsDetails Subsequent Events (Details) Details http://www.nextcure.com/role/DisclosureSubsequentEvents 63 false false R64.htm 200100 - Statement - CONDENSED BALANCE SHEETS Sheet http://www.nextcure.com/role/StatementCondensedBalanceSheetss CONDENSED BALANCE SHEETS Uncategorized 64 false false R65.htm 200105 - Statement - CONDENSED BALANCE SHEETS (Parenthetical) Sheet http://www.nextcure.com/role/StatementCondensedBalanceSheetsParentheticals CONDENSED BALANCE SHEETS (Parenthetical) Cover 65 false false R66.htm 200200 - Statement - CONDENSED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS Sheet http://www.nextcure.com/role/StatementCondensedStatementsOfOperationsAndComprehensiveLosss CONDENSED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS Statements 66 false false R67.htm 200300 - Statement - CONDENSED STATEMENTS OF STOCKHOLDERS' EQUITY Sheet http://www.nextcure.com/role/StatementCondensedStatementsOfStockholdersEquitys CONDENSED STATEMENTS OF STOCKHOLDERS' EQUITY Statements 67 false false R68.htm 200305 - Statement - CONDENSED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) Sheet http://www.nextcure.com/role/StatementCondensedStatementsOfStockholdersEquityParentheticals CONDENSED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) Statements 68 false false R69.htm 200400 - Statement - CONDENSED STATEMENTS OF CASH FLOWS Sheet http://www.nextcure.com/role/StatementCondensedStatementsOfCashFlowss CONDENSED STATEMENTS OF CASH FLOWS Statements 69 false false R70.htm 210101 - Disclosure - Nature of the Business Sheet http://www.nextcure.com/role/DisclosureNatureOfBusiness Nature of the Business Notes 70 false false R71.htm 210201 - Disclosure - Summary of Significant Accounting Policies Sheet http://www.nextcure.com/role/DisclosureSummaryOfSignificantAccountingPoliciess Summary of Significant Accounting Policies Notes 71 false false R72.htm 210301 - Disclosure - License Agreement Sheet http://www.nextcure.com/role/DisclosureLicenseAgreements License Agreement Notes 72 false false R73.htm 210401 - Disclosure - Collaboration Agreement Sheet http://www.nextcure.com/role/DisclosureCollaborationAgreements Collaboration Agreement Notes 73 false false R74.htm 210501 - Disclosure - Marketable Securities Sheet http://www.nextcure.com/role/DisclosureMarketableSecuritiess Marketable Securities Notes 74 false false R75.htm 210601 - Disclosure - Fair Value Measurements Sheet http://www.nextcure.com/role/DisclosureFairValueMeasurementss Fair Value Measurements Notes 75 false false R76.htm 210701 - Disclosure - Leases Sheet http://www.nextcure.com/role/DisclosureLeasess Leases Notes 76 false false R77.htm 210801 - Disclosure - Asset Impairment Sheet http://www.nextcure.com/role/DisclosureAssetImpairment Asset Impairment Notes 77 false false R78.htm 210901 - Disclosure - Stock-Based Compensation Sheet http://www.nextcure.com/role/DisclosureStockBasedCompensations Stock-Based Compensation Notes 78 false false R79.htm 211001 - Disclosure - Common Stock Sheet http://www.nextcure.com/role/DisclosureCommonStocks Common Stock Notes 79 false false R80.htm 211101 - Disclosure - Segment Information Sheet http://www.nextcure.com/role/DisclosureSegmentInformations Segment Information Notes 80 false false R81.htm 211201 - Disclosure - Net Loss per Share Attributable to Common Stockholders Sheet http://www.nextcure.com/role/DisclosureNetLossPerShareAttributableToCommonStockholderss Net Loss per Share Attributable to Common Stockholders Notes 81 false false R82.htm 211301 - Disclosure - Income Taxes Sheet http://www.nextcure.com/role/DisclosureIncomeTaxess Income Taxes Notes 82 false false R83.htm 211401 - Disclosure - Commitments and Contingencies Sheet http://www.nextcure.com/role/DisclosureCommitmentsAndContingenciess Commitments and Contingencies Notes 83 false false R84.htm 211501 - Disclosure - Subsequent Events Sheet http://www.nextcure.com/role/DisclosureSubsequentEventss Subsequent Events Notes 84 false false R85.htm 220202 - Disclosure - Summary of Significant Accounting Policies (Policies) Sheet http://www.nextcure.com/role/DisclosureSummaryOfSignificantAccountingPoliciesPoliciess Summary of Significant Accounting Policies (Policies) Policies http://www.nextcure.com/role/DisclosureSummaryOfSignificantAccountingPolicies 85 false false R86.htm 230503 - Disclosure - Marketable Securities (Tables) Sheet http://www.nextcure.com/role/DisclosureMarketableSecuritiesTabless Marketable Securities (Tables) Tables http://www.nextcure.com/role/DisclosureMarketableSecurities 86 false false R87.htm 230603 - Disclosure - Fair Value Measurements (Tables) Sheet http://www.nextcure.com/role/DisclosureFairValueMeasurementsTabless Fair Value Measurements (Tables) Tables http://www.nextcure.com/role/DisclosureFairValueMeasurements 87 false false R88.htm 230703 - Disclosure - Leases (Tables) Sheet http://www.nextcure.com/role/DisclosureLeasesTabless Leases (Tables) Tables http://www.nextcure.com/role/DisclosureLeases 88 false false R89.htm 230903 - Disclosure - Stock-Based Compensation (Tables) Sheet http://www.nextcure.com/role/DisclosureStockBasedCompensationTabless Stock-Based Compensation (Tables) Tables http://www.nextcure.com/role/DisclosureStockBasedCompensation 89 false false R90.htm 231103 - Disclosure - Segment Information (Tables) Sheet http://www.nextcure.com/role/DisclosureSegmentInformationTabless Segment Information (Tables) Tables http://www.nextcure.com/role/DisclosureSegmentInformation 90 false false R91.htm 231203 - Disclosure - Net Loss per Share Attributable to Common Stockholders (Tables) Sheet http://www.nextcure.com/role/DisclosureNetLossPerShareAttributableToCommonStockholdersTabless Net Loss per Share Attributable to Common Stockholders (Tables) Tables http://www.nextcure.com/role/DisclosureNetLossPerShareAttributableToCommonStockholders 91 false false R92.htm 240101 - Disclosure - Nature of the Business - Liquidity (Details) Sheet http://www.nextcure.com/role/DisclosureNatureOfBusinessLiquidityDetails Nature of the Business - Liquidity (Details) Details 92 false false R93.htm 240201 - Disclosure - Summary of Significant Accounting Policies (Details) Sheet http://www.nextcure.com/role/DisclosureSummaryOfSignificantAccountingPoliciesDetails Summary of Significant Accounting Policies (Details) Details http://www.nextcure.com/role/DisclosureSummaryOfSignificantAccountingPoliciesTables 93 false false R94.htm 240301 - Disclosure - License Agreement (Details) Sheet http://www.nextcure.com/role/DisclosureLicenseAgreementDetailss License Agreement (Details) Details http://www.nextcure.com/role/DisclosureLicenseAgreement 94 false false R95.htm 240401 - Disclosure - Collaboration Agreement (Details) Sheet http://www.nextcure.com/role/DisclosureCollaborationAgreementDetailss Collaboration Agreement (Details) Details http://www.nextcure.com/role/DisclosureCollaborationAgreement 95 false false R96.htm 240501 - Disclosure - Marketable Securities (Details) Sheet http://www.nextcure.com/role/DisclosureMarketableSecuritiesDetailss Marketable Securities (Details) Details http://www.nextcure.com/role/DisclosureMarketableSecuritiesTables 96 false false R97.htm 240601 - Disclosure - Fair Value Measurements (Details) Sheet http://www.nextcure.com/role/DisclosureFairValueMeasurementsDetailss Fair Value Measurements (Details) Details http://www.nextcure.com/role/DisclosureFairValueMeasurementsTables 97 false false R98.htm 240701 - Disclosure - Leases - Other Information (Details) Sheet http://www.nextcure.com/role/DisclosureLeasesOtherInformationDetailss Leases - Other Information (Details) Details 98 false false R99.htm 240702 - Disclosure - Leases - Maturities (Details) Sheet http://www.nextcure.com/role/DisclosureLeasesMaturitiesDetailss Leases - Maturities (Details) Details 99 false false R100.htm 240801 - Disclosure - Asset Impairment (Details) Sheet http://www.nextcure.com/role/DisclosureAssetImpairmentDetails Asset Impairment (Details) Details http://www.nextcure.com/role/DisclosureAssetImpairment 100 false false R101.htm 240901 - Disclosure - Stock-Based Compensation - Stock options (Details) Sheet http://www.nextcure.com/role/DisclosureStockBasedCompensationStockOptionsDetailss Stock-Based Compensation - Stock options (Details) Details 101 false false R102.htm 240902 - Disclosure - Stock-Based Compensation - Stock based compensation expense (Details) Sheet http://www.nextcure.com/role/DisclosureStockBasedCompensationStockBasedCompensationExpenseDetailss Stock-Based Compensation - Stock based compensation expense (Details) Details 102 false false R103.htm 240903 - Disclosure - Stock-Based Compensation - Assumptions (Details) Sheet http://www.nextcure.com/role/DisclosureStockBasedCompensationAssumptionsDetailss Stock-Based Compensation - Assumptions (Details) Details 103 false false R104.htm 241001 - Disclosure - Common Stock - Securities Purchase Agreement and Pre-Funded Warrants (Details) Sheet http://www.nextcure.com/role/DisclosureCommonStockSecuritiesPurchaseAgreementAndPreFundedWarrantsDetailss Common Stock - Securities Purchase Agreement and Pre-Funded Warrants (Details) Details 104 false false R105.htm 241101 - Disclosure - Segment Information - Other Information (Details) Sheet http://www.nextcure.com/role/DisclosureSegmentInformationOtherInformationDetailss Segment Information - Other Information (Details) Details 105 false false R106.htm 241102 - Disclosure - Segment Information - Significant expense categories (Details) Sheet http://www.nextcure.com/role/DisclosureSegmentInformationSignificantExpenseCategoriesDetailss Segment Information - Significant expense categories (Details) Details 106 false false R107.htm 241201 - Disclosure - Net Loss Per Share Attributable to Common Stockholders - Computation for basic and diluted loss per share (Details) Sheet http://www.nextcure.com/role/DisclosureNetLossPerShareAttributableToCommonStockholdersComputationForBasicAndDilutedLossPerShareDetails Net Loss Per Share Attributable to Common Stockholders - Computation for basic and diluted loss per share (Details) Details 107 false false R108.htm 241202 - Disclosure - Net Loss per Share Attributable to Common Stockholders - Anti-dilutive effect (Details) Sheet http://www.nextcure.com/role/DisclosureNetLossPerShareAttributableToCommonStockholdersAntiDilutiveEffectDetailss Net Loss per Share Attributable to Common Stockholders - Anti-dilutive effect (Details) Details 108 false false R109.htm 241301 - Disclosure - Income Taxes (Details) Sheet http://www.nextcure.com/role/DisclosureIncomeTaxesDetails Income Taxes (Details) Details http://www.nextcure.com/role/DisclosureIncomeTaxesTables 109 false false R110.htm 241501 - Disclosure - Subsequent Events (Details) Sheet http://www.nextcure.com/role/DisclosureSubsequentEventsDetailss Subsequent Events (Details) Details http://www.nextcure.com/role/DisclosureSubsequentEvents 110 false false R111.htm 995210 - Document - Submission Sheet http://xbrl.sec.gov/ffd/role/document/submissionTable Submission Cover 111 true false R112.htm 995211 - Document - Offerings Sheet http://xbrl.sec.gov/ffd/role/document/feesOfferingTable Offerings Cover 112 false false R113.htm 995215 - Document - Fees Summary Sheet http://xbrl.sec.gov/ffd/role/document/feesSummaryTable Fees Summary Cover 113 false false All Reports Book All Reports nxtc-20260630.xsd nxtc-20260630_cal.xml nxtc-20260630_def.xml nxtc-20260630_lab.xml nxtc-20260630_pre.xml nxtc-20260630xs4.htm nxtc-20260630xexfees.htm nxtc-20260630xs4007.jpg nxtc-20260630xs4008.jpg nxtc-20260630xs4019.jpg nxtc-20260630xs4020.jpg nxtc-20260630xs4024.jpg nxtc-20260630xs4025.jpg nxtc-20260630xs4026.jpg nxtc-20260630xs4027.jpg nxtc-20260630xs4028.jpg nxtc-20260630xs4029.jpg http://fasb.org/us-gaap/2026 http://xbrl.sec.gov/dei/2026 http://xbrl.sec.gov/ffd/2026 true true