3.22.2.2 html 494 419 1 true 168 0 false 9 false false R1.htm 1001 - Document - Cover Page Sheet http://www.Castellum.com/role/CoverPage Cover Page Cover 1 false false R2.htm 1002 - Statement - Condensed Consolidated Balance Sheets Sheet http://www.Castellum.com/role/CondensedConsolidatedBalanceSheets Condensed Consolidated Balance Sheets Statements 2 false false R3.htm 1003 - Statement - Condensed Consolidated Balance Sheets (Parenthetical) Sheet http://www.Castellum.com/role/CondensedConsolidatedBalanceSheetsParenthetical Condensed Consolidated Balance Sheets (Parenthetical) Statements 3 false false R4.htm 1004 - Statement - Condensed Consolidated Statements of Operations Sheet http://www.Castellum.com/role/CondensedConsolidatedStatementsOfOperations Condensed Consolidated Statements of Operations Statements 4 false false R5.htm 1005 - Statement - Condensed Consolidated Statement Of Changes In Stockholders' Equity Sheet http://www.Castellum.com/role/CondensedConsolidatedStatementOfChangesInStockholdersEquity Condensed Consolidated Statement Of Changes In Stockholders' Equity Statements 5 false false R6.htm 1006 - Statement - Condensed Consolidated Statements of Cash Flows Sheet http://www.Castellum.com/role/CondensedConsolidatedStatementsOfCashFlows Condensed Consolidated Statements of Cash Flows Statements 6 false false R7.htm 1007 - Disclosure - Nature of Operations Sheet http://www.Castellum.com/role/NatureOfOperations Nature of Operations Notes 7 false false R8.htm 1008 - Disclosure - Summary of Significant Accounting Policies Sheet http://www.Castellum.com/role/SummaryOfSignificantAccountingPolicies Summary of Significant Accounting Policies Notes 8 false false R9.htm 1009 - Disclosure - Acquisitions Sheet http://www.Castellum.com/role/Acquisitions Acquisitions Notes 9 false false R10.htm 1010 - Disclosure - Fixed Assets Sheet http://www.Castellum.com/role/FixedAssets Fixed Assets Notes 10 false false R11.htm 1011 - Disclosure - Intangible Assets and Goodwill Sheet http://www.Castellum.com/role/IntangibleAssetsAndGoodwill Intangible Assets and Goodwill Notes 11 false false R12.htm 1012 - Disclosure - Convertible Promissory Notes - Related Parties Notes http://www.Castellum.com/role/ConvertiblePromissoryNotesRelatedParties Convertible Promissory Notes - Related Parties Notes 12 false false R13.htm 1013 - Disclosure - Notes Payable Notes http://www.Castellum.com/role/NotesPayable Notes Payable Notes 13 false false R14.htm 1014 - Disclosure - Note Payable - Related Party Sheet http://www.Castellum.com/role/NotePayableRelatedParty Note Payable - Related Party Notes 14 false false R15.htm 1015 - Disclosure - Revolving Credit Facility Sheet http://www.Castellum.com/role/RevolvingCreditFacility Revolving Credit Facility Notes 15 false false R16.htm 1016 - Disclosure - Due To Seller Sheet http://www.Castellum.com/role/DueToSeller Due To Seller Notes 16 false false R17.htm 1017 - Disclosure - Stockholders' Equity (Deficit) Sheet http://www.Castellum.com/role/StockholdersEquityDeficit Stockholders' Equity (Deficit) Notes 17 false false R18.htm 1018 - Disclosure - Fair Value Sheet http://www.Castellum.com/role/FairValue Fair Value Notes 18 false false R19.htm 1019 - Disclosure - Concentrations Sheet http://www.Castellum.com/role/Concentrations Concentrations Notes 19 false false R20.htm 1020 - Disclosure - Related-Party Transactions Sheet http://www.Castellum.com/role/RelatedPartyTransactions Related-Party Transactions Notes 20 false false R21.htm 1021 - Disclosure - Commitments Sheet http://www.Castellum.com/role/Commitments Commitments Notes 21 false false R22.htm 1022 - Disclosure - Income Taxes Sheet http://www.Castellum.com/role/IncomeTaxes Income Taxes Notes 22 false false R23.htm 1023 - Disclosure - Subsequent Events Sheet http://www.Castellum.com/role/SubsequentEvents Subsequent Events Notes 23 false false R24.htm 1024 - Disclosure - Summary of Significant Accounting Policies (Policies) Sheet http://www.Castellum.com/role/SummaryOfSignificantAccountingPoliciesPolicies Summary of Significant Accounting Policies (Policies) Policies http://www.Castellum.com/role/SummaryOfSignificantAccountingPolicies 24 false false R25.htm 1025 - Disclosure - Summary of Significant Accounting Policies (Tables) Sheet http://www.Castellum.com/role/SummaryOfSignificantAccountingPoliciesTables Summary of Significant Accounting Policies (Tables) Tables http://www.Castellum.com/role/SummaryOfSignificantAccountingPolicies 25 false false R26.htm 1026 - Disclosure - Acquisitions (Tables) Sheet http://www.Castellum.com/role/AcquisitionsTables Acquisitions (Tables) Tables http://www.Castellum.com/role/Acquisitions 26 false false R27.htm 1027 - Disclosure - Fixed Assets (Tables) Sheet http://www.Castellum.com/role/FixedAssetsTables Fixed Assets (Tables) Tables http://www.Castellum.com/role/FixedAssets 27 false false R28.htm 1028 - Disclosure - Intangible Assets and Goodwill (Tables) Sheet http://www.Castellum.com/role/IntangibleAssetsAndGoodwillTables Intangible Assets and Goodwill (Tables) Tables http://www.Castellum.com/role/IntangibleAssetsAndGoodwill 28 false false R29.htm 1029 - Disclosure - Convertible Promissory Notes - Related Parties (Tables) Notes http://www.Castellum.com/role/ConvertiblePromissoryNotesRelatedPartiesTables Convertible Promissory Notes - Related Parties (Tables) Tables http://www.Castellum.com/role/ConvertiblePromissoryNotesRelatedParties 29 false false R30.htm 1030 - Disclosure - Notes Payable (Tables) Notes http://www.Castellum.com/role/NotesPayableTables Notes Payable (Tables) Tables http://www.Castellum.com/role/NotesPayable 30 false false R31.htm 1031 - Disclosure - Note Payable - Related Party (Tables) Sheet http://www.Castellum.com/role/NotePayableRelatedPartyTables Note Payable - Related Party (Tables) Tables http://www.Castellum.com/role/NotePayableRelatedParty 31 false false R32.htm 1032 - Disclosure - Stockholders' Equity (Deficit) (Tables) Sheet http://www.Castellum.com/role/StockholdersEquityDeficitTables Stockholders' Equity (Deficit) (Tables) Tables http://www.Castellum.com/role/StockholdersEquityDeficit 32 false false R33.htm 1033 - Disclosure - Fair Value (Tables) Sheet http://www.Castellum.com/role/FairValueTables Fair Value (Tables) Tables http://www.Castellum.com/role/FairValue 33 false false R34.htm 1034 - Disclosure - Nature of Operations - Additional Information (Detail) Sheet http://www.Castellum.com/role/NatureOfOperationsAdditionalInformationDetail Nature of Operations - Additional Information (Detail) Details 34 false false R35.htm 1035 - Disclosure - Summary of Significant Accounting Policies - Schedule of Company's Revenue By Contract Type (Detail) Sheet http://www.Castellum.com/role/SummaryOfSignificantAccountingPoliciesScheduleOfCompanySRevenueByContractTypeDetail Summary of Significant Accounting Policies - Schedule of Company's Revenue By Contract Type (Detail) Details 35 false false R36.htm 1036 - Disclosure - Summary of Significant Accounting Policies - Additional Information (Detail) Sheet http://www.Castellum.com/role/SummaryOfSignificantAccountingPoliciesAdditionalInformationDetail Summary of Significant Accounting Policies - Additional Information (Detail) Details 36 false false R37.htm 1037 - Disclosure - Acquisitions - Additional Information (Detail) Sheet http://www.Castellum.com/role/AcquisitionsAdditionalInformationDetail Acquisitions - Additional Information (Detail) Details 37 false false R38.htm 1038 - Disclosure - Acquisitions - Schedule of Assets and Liabilities Acquired (Detail) Sheet http://www.Castellum.com/role/AcquisitionsScheduleOfAssetsAndLiabilitiesAcquiredDetail Acquisitions - Schedule of Assets and Liabilities Acquired (Detail) Details 38 false false R39.htm 1039 - Disclosure - Acquisitions - Schedule of Assets and Liabilities Acquired (Parenthetical) (Detail) Sheet http://www.Castellum.com/role/AcquisitionsScheduleOfAssetsAndLiabilitiesAcquiredParentheticalDetail Acquisitions - Schedule of Assets and Liabilities Acquired (Parenthetical) (Detail) Details 39 false false R40.htm 1040 - Disclosure - Acquisitions - Schedule of Assets Acquired (Detail) Sheet http://www.Castellum.com/role/AcquisitionsScheduleOfAssetsAcquiredDetail Acquisitions - Schedule of Assets Acquired (Detail) Details 40 false false R41.htm 1041 - Disclosure - Acquisitions - Schedule of Assets Acquired (Parenthetical) (Detail) Sheet http://www.Castellum.com/role/AcquisitionsScheduleOfAssetsAcquiredParentheticalDetail Acquisitions - Schedule of Assets Acquired (Parenthetical) (Detail) Details 41 false false R42.htm 1042 - Disclosure - Acquisitions - Schedule of Business Acquisition, Pro Forma Information (Detail) Sheet http://www.Castellum.com/role/AcquisitionsScheduleOfBusinessAcquisitionProFormaInformationDetail Acquisitions - Schedule of Business Acquisition, Pro Forma Information (Detail) Details 42 false false R43.htm 1043 - Disclosure - Fixed Assets - Summary of Fixed Assets (Detail) Sheet http://www.Castellum.com/role/FixedAssetsSummaryOfFixedAssetsDetail Fixed Assets - Summary of Fixed Assets (Detail) Details 43 false false R44.htm 1044 - Disclosure - Fixed Assets - Additional Information (Details) Sheet http://www.Castellum.com/role/FixedAssetsAdditionalInformationDetails Fixed Assets - Additional Information (Details) Details 44 false false R45.htm 1045 - Disclosure - Intangible Assets and Goodwill - Schedule of Intangible Assets (Detail) Sheet http://www.Castellum.com/role/IntangibleAssetsAndGoodwillScheduleOfIntangibleAssetsDetail Intangible Assets and Goodwill - Schedule of Intangible Assets (Detail) Details 45 false false R46.htm 1046 - Disclosure - Intangible Assets and Goodwill - Additional Information (Detail) Sheet http://www.Castellum.com/role/IntangibleAssetsAndGoodwillAdditionalInformationDetail Intangible Assets and Goodwill - Additional Information (Detail) Details 46 false false R47.htm 1047 - Disclosure - Intangible Assets and Goodwill - Schedule of Future Amortization of Intangible Assets (Detail) Sheet http://www.Castellum.com/role/IntangibleAssetsAndGoodwillScheduleOfFutureAmortizationOfIntangibleAssetsDetail Intangible Assets and Goodwill - Schedule of Future Amortization of Intangible Assets (Detail) Details 47 false false R48.htm 1048 - Disclosure - Intangible Assets and Goodwill - Schedule of Goodwill (Detail) Sheet http://www.Castellum.com/role/IntangibleAssetsAndGoodwillScheduleOfGoodwillDetail Intangible Assets and Goodwill - Schedule of Goodwill (Detail) Details 48 false false R49.htm 1049 - Disclosure - Convertible Promissory Notes - Related Parties - Schedule of Convertible Promissory Notes, Related party (Detail) Notes http://www.Castellum.com/role/ConvertiblePromissoryNotesRelatedPartiesScheduleOfConvertiblePromissoryNotesRelatedPartyDetail Convertible Promissory Notes - Related Parties - Schedule of Convertible Promissory Notes, Related party (Detail) Details 49 false false R50.htm 1050 - Disclosure - Convertible Promissory Notes - Related Parties - Schedule of Convertible Promissory Notes, Related party (Parenthetical) (Details) Notes http://www.Castellum.com/role/ConvertiblePromissoryNotesRelatedPartiesScheduleOfConvertiblePromissoryNotesRelatedPartyParentheticalDetails Convertible Promissory Notes - Related Parties - Schedule of Convertible Promissory Notes, Related party (Parenthetical) (Details) Details 50 false false R51.htm 1051 - Disclosure - Convertible Promissory Notes - Related Parties - Additional Information (Detail) Notes http://www.Castellum.com/role/ConvertiblePromissoryNotesRelatedPartiesAdditionalInformationDetail Convertible Promissory Notes - Related Parties - Additional Information (Detail) Details 51 false false R52.htm 1052 - Disclosure - Notes Payable - Schedule of Notes Payable (Detail) Notes http://www.Castellum.com/role/NotesPayableScheduleOfNotesPayableDetail Notes Payable - Schedule of Notes Payable (Detail) Details 52 false false R53.htm 1053 - Disclosure - Notes Payable - Schedule of Notes Payable (Parenthetical) (Detail) Notes http://www.Castellum.com/role/NotesPayableScheduleOfNotesPayableParentheticalDetail Notes Payable - Schedule of Notes Payable (Parenthetical) (Detail) Details 53 false false R54.htm 1054 - Disclosure - Notes Payable - Schedule of Repayment, Net of Discounts (Detail) Notes http://www.Castellum.com/role/NotesPayableScheduleOfRepaymentNetOfDiscountsDetail Notes Payable - Schedule of Repayment, Net of Discounts (Detail) Details 54 false false R55.htm 1055 - Disclosure - Notes Payable - Additional Information (Detail) Notes http://www.Castellum.com/role/NotesPayableAdditionalInformationDetail Notes Payable - Additional Information (Detail) Details 55 false false R56.htm 1056 - Disclosure - Note Payable - Related Party - Schedule Of Notes Payable To Related Party (Details) Notes http://www.Castellum.com/role/NotePayableRelatedPartyScheduleOfNotesPayableToRelatedPartyDetails Note Payable - Related Party - Schedule Of Notes Payable To Related Party (Details) Details 56 false false R57.htm 1057 - Disclosure - Note Payable - Related Party - Additional Information (Details) Sheet http://www.Castellum.com/role/NotePayableRelatedPartyAdditionalInformationDetails Note Payable - Related Party - Additional Information (Details) Details 57 false false R58.htm 1058 - Disclosure - Revolving Credit Facility - Additional Information (Detail) Sheet http://www.Castellum.com/role/RevolvingCreditFacilityAdditionalInformationDetail Revolving Credit Facility - Additional Information (Detail) Details 58 false false R59.htm 1059 - Disclosure - Due To Seller - Additional Information (Detail) Sheet http://www.Castellum.com/role/DueToSellerAdditionalInformationDetail Due To Seller - Additional Information (Detail) Details 59 false false R60.htm 1060 - Disclosure - Stockholders' Equity (Deficit) - Schedule of warrants (Detail) Sheet http://www.Castellum.com/role/StockholdersEquityDeficitScheduleOfWarrantsDetail Stockholders' Equity (Deficit) - Schedule of warrants (Detail) Details http://www.Castellum.com/role/StockholdersEquityDeficitTables 60 false false R61.htm 1061 - Disclosure - Stockholders' Equity (Deficit) - Schedule of options (Detail) Sheet http://www.Castellum.com/role/StockholdersEquityDeficitScheduleOfOptionsDetail Stockholders' Equity (Deficit) - Schedule of options (Detail) Details http://www.Castellum.com/role/StockholdersEquityDeficitTables 61 false false R62.htm 1062 - Disclosure - Stockholders' Equity (Deficit) - Schedule of Stock Options, Valuation Assumptions (Detail) Sheet http://www.Castellum.com/role/StockholdersEquityDeficitScheduleOfStockOptionsValuationAssumptionsDetail Stockholders' Equity (Deficit) - Schedule of Stock Options, Valuation Assumptions (Detail) Details http://www.Castellum.com/role/StockholdersEquityDeficitTables 62 false false R63.htm 1063 - Disclosure - Stockholders' Equity (Deficit) - Additional Information (Detail) Sheet http://www.Castellum.com/role/StockholdersEquityDeficitAdditionalInformationDetail Stockholders' Equity (Deficit) - Additional Information (Detail) Details http://www.Castellum.com/role/StockholdersEquityDeficitTables 63 false false R64.htm 1064 - Disclosure - Fair Value - Summary of Derivative Liabilities and the Contingent Earn out Fall (Detail) Sheet http://www.Castellum.com/role/FairValueSummaryOfDerivativeLiabilitiesAndTheContingentEarnOutFallDetail Fair Value - Summary of Derivative Liabilities and the Contingent Earn out Fall (Detail) Details 64 false false R65.htm 1065 - Disclosure - Fair Value - Summary of Derivative liabilities (Detail) Sheet http://www.Castellum.com/role/FairValueSummaryOfDerivativeLiabilitiesDetail Fair Value - Summary of Derivative liabilities (Detail) Details 65 false false R66.htm 1066 - Disclosure - Fair Value - Summary of Derivative liabilities (Parenthetical) (Detail) Sheet http://www.Castellum.com/role/FairValueSummaryOfDerivativeLiabilitiesParentheticalDetail Fair Value - Summary of Derivative liabilities (Parenthetical) (Detail) Details 66 false false R67.htm 1067 - Disclosure - Fair Value - Additional Information (Detail) Sheet http://www.Castellum.com/role/FairValueAdditionalInformationDetail Fair Value - Additional Information (Detail) Details 67 false false R68.htm 1068 - Disclosure - Fair Value - Summary of Change in the Fair Value of the Derivative Liabilities (Detail) Sheet http://www.Castellum.com/role/FairValueSummaryOfChangeInTheFairValueOfTheDerivativeLiabilitiesDetail Fair Value - Summary of Change in the Fair Value of the Derivative Liabilities (Detail) Details 68 false false R69.htm 1069 - Disclosure - Fair Value - Summary of Fair Value Measurements (Detail) Sheet http://www.Castellum.com/role/FairValueSummaryOfFairValueMeasurementsDetail Fair Value - Summary of Fair Value Measurements (Detail) Details 69 false false R70.htm 1070 - Disclosure - Concentrations - Additional Information (Details) Sheet http://www.Castellum.com/role/ConcentrationsAdditionalInformationDetails Concentrations - Additional Information (Details) Details 70 false false R71.htm 1071 - Disclosure - Related-Party Transactions - Additional Information (Details) Sheet http://www.Castellum.com/role/RelatedPartyTransactionsAdditionalInformationDetails Related-Party Transactions - Additional Information (Details) Details 71 false false R72.htm 1072 - Disclosure - Commitments - Additional Information (Details) Sheet http://www.Castellum.com/role/CommitmentsAdditionalInformationDetails Commitments - Additional Information (Details) Details 72 false false R73.htm 1073 - Disclosure - Income Taxes - Additional Information (Detail) Sheet http://www.Castellum.com/role/IncomeTaxesAdditionalInformationDetail Income Taxes - Additional Information (Detail) Details 73 false false R74.htm 1074 - Disclosure - Subsequent Events - Additional Information (Detail) Sheet http://www.Castellum.com/role/SubsequentEventsAdditionalInformationDetail Subsequent Events - Additional Information (Detail) Details 74 false false All Reports Book All Reports [ix-0514-Hidden-Fact-Eligible-For-Transform] WARN: 17 fact(s) appearing in ix:hidden were eligible for transformation: ctm:EmploymentAgreementsGeneralTerm, ctm:EmploymentAgreementsTerm, dei:EntityAddressStateOrProvince, dei:EntityFileNumber, dei:EntityIncorporationStateCountryCode, us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross, us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage - ctm-20220930.htm 4 ctm-20220930.htm ctm-20220930.xsd ctm-20220930_cal.xml ctm-20220930_def.xml ctm-20220930_lab.xml ctm-20220930_pre.xml lb044_ex10-23.htm lb044_ex31-1.htm lb044_ex31-2.htm lb044_ex32-1.htm lb044_ex32-2.htm http://fasb.org/us-gaap/2022 http://xbrl.sec.gov/dei/2022 true true