3.19.3.a.u2 html 190 354 1 true 58 0 false 6 false false R1.htm 00090 - Document - Document and Entity Information Sheet http://www.anterix.com/role/DocumentDocumentAndEntityInformation Document and Entity Information Cover 1 false false R2.htm 00100 - Statement - Consolidated Balance Sheets Sheet http://www.anterix.com/role/StatementConsolidatedBalanceSheets Consolidated Balance Sheets Statements 2 false false R3.htm 00105 - Statement - Consolidated Balance Sheets (Parenthetical) Sheet http://www.anterix.com/role/StatementConsolidatedBalanceSheetsParenthetical Consolidated Balance Sheets (Parenthetical) Statements 3 false false R4.htm 00200 - Statement - Consolidated Statements of Operations Sheet http://www.anterix.com/role/StatementConsolidatedStatementsOfOperations Consolidated Statements of Operations Statements 4 false false R5.htm 00300 - Statement - Consolidated Statement of Stockholders??? Equity Sheet http://www.anterix.com/role/StatementConsolidatedStatementOfStockholdersEquity Consolidated Statement of Stockholders??? Equity Statements 5 false false R6.htm 00400 - Statement - Consolidated Statements of Cash Flows Sheet http://www.anterix.com/role/StatementConsolidatedStatementsOfCashFlows Consolidated Statements of Cash Flows Statements 6 false false R7.htm 10101 - Disclosure - Nature of Operations Sheet http://www.anterix.com/role/DisclosureNatureOfOperations Nature of Operations Notes 7 false false R8.htm 10201 - Disclosure - Summary of Significant Accounting Policies Sheet http://www.anterix.com/role/DisclosureSummaryOfSignificantAccountingPolicies Summary of Significant Accounting Policies Notes 8 false false R9.htm 10301 - Disclosure - Revenue Sheet http://www.anterix.com/role/DisclosureRevenue Revenue Notes 9 false false R10.htm 10401 - Disclosure - Property and Equipment Sheet http://www.anterix.com/role/DisclosurePropertyAndEquipment Property and Equipment Notes 10 false false R11.htm 10501 - Disclosure - Intangible Assets Sheet http://www.anterix.com/role/DisclosureIntangibleAssets Intangible Assets Notes 11 false false R12.htm 10601 - Disclosure - Equity Method Investment Sheet http://www.anterix.com/role/DisclosureEquityMethodInvestment Equity Method Investment Notes 12 false false R13.htm 10701 - Disclosure - Related Party Transactions Sheet http://www.anterix.com/role/DisclosureRelatedPartyTransactions Related Party Transactions Notes 13 false false R14.htm 10801 - Disclosure - Impairment and Restructuring Charges Sheet http://www.anterix.com/role/DisclosureImpairmentAndRestructuringCharges Impairment and Restructuring Charges Notes 14 false false R15.htm 10901 - Disclosure - Leases Sheet http://www.anterix.com/role/DisclosureLeases Leases Notes 15 false false R16.htm 11001 - Disclosure - Income Taxes Sheet http://www.anterix.com/role/DisclosureIncomeTaxes Income Taxes Notes 16 false false R17.htm 11101 - Disclosure - Stock Acquisition Rights, Stock Options and Warrants Sheet http://www.anterix.com/role/DisclosureStockAcquisitionRightsStockOptionsAndWarrants Stock Acquisition Rights, Stock Options and Warrants Notes 17 false false R18.htm 11201 - Disclosure - Contingencies Sheet http://www.anterix.com/role/DisclosureContingencies Contingencies Notes 18 false false R19.htm 11301 - Disclosure - Concentrations of Credit Risk Sheet http://www.anterix.com/role/DisclosureConcentrationsOfCreditRisk Concentrations of Credit Risk Notes 19 false false R20.htm 11401 - Disclosure - Business Concentrations Sheet http://www.anterix.com/role/DisclosureBusinessConcentrations Business Concentrations Notes 20 false false R21.htm 20202 - Disclosure - Summary of Significant Accounting Policies (Policies) Sheet http://www.anterix.com/role/DisclosureSummaryOfSignificantAccountingPoliciesPolicies Summary of Significant Accounting Policies (Policies) Policies http://www.anterix.com/role/DisclosureSummaryOfSignificantAccountingPolicies 21 false false R22.htm 30203 - Disclosure - Summary of Significant Accounting Policies (Tables) Sheet http://www.anterix.com/role/DisclosureSummaryOfSignificantAccountingPoliciesTables Summary of Significant Accounting Policies (Tables) Tables http://www.anterix.com/role/DisclosureSummaryOfSignificantAccountingPolicies 22 false false R23.htm 30303 - Disclosure - Revenue (Tables) Sheet http://www.anterix.com/role/DisclosureRevenueTables Revenue (Tables) Tables http://www.anterix.com/role/DisclosureRevenue 23 false false R24.htm 30403 - Disclosure - Property and Equipment (Tables) Sheet http://www.anterix.com/role/DisclosurePropertyAndEquipmentTables Property and Equipment (Tables) Tables http://www.anterix.com/role/DisclosurePropertyAndEquipment 24 false false R25.htm 30503 - Disclosure - Intangible Assets (Tables) Sheet http://www.anterix.com/role/DisclosureIntangibleAssetsTables Intangible Assets (Tables) Tables http://www.anterix.com/role/DisclosureIntangibleAssets 25 false false R26.htm 30603 - Disclosure - Equity Method Investment (Tables) Sheet http://www.anterix.com/role/DisclosureEquityMethodInvestmentTables Equity Method Investment (Tables) Tables http://www.anterix.com/role/DisclosureEquityMethodInvestment 26 false false R27.htm 30803 - Disclosure - Impairment and Restructuring Charges (Tables) Sheet http://www.anterix.com/role/DisclosureImpairmentAndRestructuringChargesTables Impairment and Restructuring Charges (Tables) Tables http://www.anterix.com/role/DisclosureImpairmentAndRestructuringCharges 27 false false R28.htm 30903 - Disclosure - Leases (Tables) Sheet http://www.anterix.com/role/DisclosureLeasesTables Leases (Tables) Tables http://www.anterix.com/role/DisclosureLeases 28 false false R29.htm 31103 - Disclosure - Stock Acquisition Rights, Stock Options and Warrants (Tables) Sheet http://www.anterix.com/role/DisclosureStockAcquisitionRightsStockOptionsAndWarrantsTables Stock Acquisition Rights, Stock Options and Warrants (Tables) Tables http://www.anterix.com/role/DisclosureStockAcquisitionRightsStockOptionsAndWarrants 29 false false R30.htm 40101 - Disclosure - Nature of Operations (Details) Sheet http://www.anterix.com/role/DisclosureNatureOfOperationsDetails Nature of Operations (Details) Details http://www.anterix.com/role/DisclosureNatureOfOperations 30 false false R31.htm 40201 - Disclosure - Summary of Significant Accounting Policies (Narrative) (Details) Sheet http://www.anterix.com/role/DisclosureSummaryOfSignificantAccountingPoliciesNarrativeDetails Summary of Significant Accounting Policies (Narrative) (Details) Details http://www.anterix.com/role/DisclosureSummaryOfSignificantAccountingPoliciesTables 31 false false R32.htm 40203 - Disclosure - Summary of Significant Accounting Policies (Summary of Changes in Liability For Asset Retirement Obligations) (Details) Sheet http://www.anterix.com/role/DisclosureSummaryOfSignificantAccountingPoliciesSummaryOfChangesInLiabilityForAssetRetirementObligationsDetails Summary of Significant Accounting Policies (Summary of Changes in Liability For Asset Retirement Obligations) (Details) Details http://www.anterix.com/role/DisclosureSummaryOfSignificantAccountingPoliciesTables 32 false false R33.htm 40301 - Disclosure - Revenue (Narrative) (Details) Sheet http://www.anterix.com/role/DisclosureRevenueNarrativeDetails Revenue (Narrative) (Details) Details http://www.anterix.com/role/DisclosureRevenueTables 33 false false R34.htm 40303 - Disclosure - Revenue (Schedule of Contract Assets) (Details) Sheet http://www.anterix.com/role/DisclosureRevenueScheduleOfContractAssetsDetails Revenue (Schedule of Contract Assets) (Details) Details http://www.anterix.com/role/DisclosureRevenueTables 34 false false R35.htm 40401 - Disclosure - Property and Equipment (Narrative) (Details) Sheet http://www.anterix.com/role/DisclosurePropertyAndEquipmentNarrativeDetails Property and Equipment (Narrative) (Details) Details http://www.anterix.com/role/DisclosurePropertyAndEquipmentTables 35 false false R36.htm 40402 - Disclosure - Property and Equipment (Components of Property and Equipment) (Details) Sheet http://www.anterix.com/role/DisclosurePropertyAndEquipmentComponentsOfPropertyAndEquipmentDetails Property and Equipment (Components of Property and Equipment) (Details) Details http://www.anterix.com/role/DisclosurePropertyAndEquipmentTables 36 false false R37.htm 40501 - Disclosure - Intangible Assets (Narrative) (Details) Sheet http://www.anterix.com/role/DisclosureIntangibleAssetsNarrativeDetails Intangible Assets (Narrative) (Details) Details http://www.anterix.com/role/DisclosureIntangibleAssetsTables 37 false false R38.htm 40502 - Disclosure - Intangible Assets (Schedule of Indefinite-Lived Intangible Assets) (Details) Sheet http://www.anterix.com/role/DisclosureIntangibleAssetsScheduleOfIndefiniteLivedIntangibleAssetsDetails Intangible Assets (Schedule of Indefinite-Lived Intangible Assets) (Details) Details http://www.anterix.com/role/DisclosureIntangibleAssetsTables 38 false false R39.htm 40601 - Disclosure - Equity Method Investment (Narrative) (Details) Sheet http://www.anterix.com/role/DisclosureEquityMethodInvestmentNarrativeDetails Equity Method Investment (Narrative) (Details) Details http://www.anterix.com/role/DisclosureEquityMethodInvestmentTables 39 false false R40.htm 40602 - Disclosure - Equity Method Investment (Equity Method Investment) (Details) Sheet http://www.anterix.com/role/DisclosureEquityMethodInvestmentEquityMethodInvestmentDetails Equity Method Investment (Equity Method Investment) (Details) Details http://www.anterix.com/role/DisclosureEquityMethodInvestmentTables 40 false false R41.htm 40701 - Disclosure - Related Party Transactions (Details) Sheet http://www.anterix.com/role/DisclosureRelatedPartyTransactionsDetails Related Party Transactions (Details) Details http://www.anterix.com/role/DisclosureRelatedPartyTransactions 41 false false R42.htm 40801 - Disclosure - Impairment and Restructuring Charges (Narrative) (Details) Sheet http://www.anterix.com/role/DisclosureImpairmentAndRestructuringChargesNarrativeDetails Impairment and Restructuring Charges (Narrative) (Details) Details http://www.anterix.com/role/DisclosureImpairmentAndRestructuringChargesTables 42 false false R43.htm 40802 - Disclosure - Impairment and Restructuring Charges (Schedule of Accrued Restructuring Charges) (Details) Sheet http://www.anterix.com/role/DisclosureImpairmentAndRestructuringChargesScheduleOfAccruedRestructuringChargesDetails Impairment and Restructuring Charges (Schedule of Accrued Restructuring Charges) (Details) Details http://www.anterix.com/role/DisclosureImpairmentAndRestructuringChargesTables 43 false false R44.htm 40901 - Disclosure - Leases (Narrative) (Details) Sheet http://www.anterix.com/role/DisclosureLeasesNarrativeDetails Leases (Narrative) (Details) Details http://www.anterix.com/role/DisclosureLeasesTables 44 false false R45.htm 40902 - Disclosure - Leases (Lease Cost) (Details) Sheet http://www.anterix.com/role/DisclosureLeasesLeaseCostDetails Leases (Lease Cost) (Details) Details http://www.anterix.com/role/DisclosureLeasesTables 45 false false R46.htm 40903 - Disclosure - Leases (Supplemental Lease Information) (Details) Sheet http://www.anterix.com/role/DisclosureLeasesSupplementalLeaseInformationDetails Leases (Supplemental Lease Information) (Details) Details http://www.anterix.com/role/DisclosureLeasesTables 46 false false R47.htm 40904 - Disclosure - Leases (Future Minimum Payments) (Details) Sheet http://www.anterix.com/role/DisclosureLeasesFutureMinimumPaymentsDetails Leases (Future Minimum Payments) (Details) Details http://www.anterix.com/role/DisclosureLeasesTables 47 false false R48.htm 41001 - Disclosure - Income Taxes (Details) Sheet http://www.anterix.com/role/DisclosureIncomeTaxesDetails Income Taxes (Details) Details http://www.anterix.com/role/DisclosureIncomeTaxes 48 false false R49.htm 41101 - Disclosure - Stock Acquisition Rights, Stock Options and Warrants (Narrative) (Details) Sheet http://www.anterix.com/role/DisclosureStockAcquisitionRightsStockOptionsAndWarrantsNarrativeDetails Stock Acquisition Rights, Stock Options and Warrants (Narrative) (Details) Details http://www.anterix.com/role/DisclosureStockAcquisitionRightsStockOptionsAndWarrantsTables 49 false false R50.htm 41102 - Disclosure - Stock Acquisition Rights, Stock Options and Warrants (Summary of Restricted Stock and Restricted Stock Units Activity) (Details) Sheet http://www.anterix.com/role/DisclosureStockAcquisitionRightsStockOptionsAndWarrantsSummaryOfRestrictedStockAndRestrictedStockUnitsActivityDetails Stock Acquisition Rights, Stock Options and Warrants (Summary of Restricted Stock and Restricted Stock Units Activity) (Details) Details http://www.anterix.com/role/DisclosureStockAcquisitionRightsStockOptionsAndWarrantsTables 50 false false R51.htm 41103 - Disclosure - Stock Acquisition Rights, Stock Options and Warrants (Summary of Performance Stock Activity) (Details) Sheet http://www.anterix.com/role/DisclosureStockAcquisitionRightsStockOptionsAndWarrantsSummaryOfPerformanceStockActivityDetails Stock Acquisition Rights, Stock Options and Warrants (Summary of Performance Stock Activity) (Details) Details http://www.anterix.com/role/DisclosureStockAcquisitionRightsStockOptionsAndWarrantsTables 51 false false R52.htm 41104 - Disclosure - Stock Acquisition Rights, Stock Options and Warrants (Summary of Stock Option Activity) (Details) Sheet http://www.anterix.com/role/DisclosureStockAcquisitionRightsStockOptionsAndWarrantsSummaryOfStockOptionActivityDetails Stock Acquisition Rights, Stock Options and Warrants (Summary of Stock Option Activity) (Details) Details http://www.anterix.com/role/DisclosureStockAcquisitionRightsStockOptionsAndWarrantsTables 52 false false R53.htm 41107 - Disclosure - Stock Acquisition Rights, Stock Options and Warrants (Summary of Performance Stock Options) (Details) Sheet http://www.anterix.com/role/DisclosureStockAcquisitionRightsStockOptionsAndWarrantsSummaryOfPerformanceStockOptionsDetails Stock Acquisition Rights, Stock Options and Warrants (Summary of Performance Stock Options) (Details) Details http://www.anterix.com/role/DisclosureStockAcquisitionRightsStockOptionsAndWarrantsTables 53 false false R54.htm 41301 - Disclosure - Concentrations of Credit Risk (Details) Sheet http://www.anterix.com/role/DisclosureConcentrationsOfCreditRiskDetails Concentrations of Credit Risk (Details) Details http://www.anterix.com/role/DisclosureConcentrationsOfCreditRisk 54 false false R55.htm 41401 - Disclosure - Business Concentrations (Details) Sheet http://www.anterix.com/role/DisclosureBusinessConcentrationsDetails Business Concentrations (Details) Details http://www.anterix.com/role/DisclosureBusinessConcentrations 55 false false All Reports Book All Reports atex-20191231.xml atex-20191231.xsd atex-20191231_cal.xml atex-20191231_def.xml atex-20191231_lab.xml atex-20191231_pre.xml http://fasb.org/srt/2019-01-31 http://xbrl.sec.gov/dei/2019-01-31 http://fasb.org/us-gaap/2019-01-31 true true