3.26.1 html 229 332 1 false 59 0 false 8 false false R1.htm 995200090 - Document - Document and Entity Information Sheet http://www.cytosorbents.com/role/DocumentDocumentAndEntityInformation Document and Entity Information Cover 1 false false R2.htm 995200100 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS Sheet http://www.cytosorbents.com/role/StatementCondensedConsolidatedBalanceSheets CONDENSED CONSOLIDATED BALANCE SHEETS Statements 2 false false R3.htm 995200105 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) Sheet http://www.cytosorbents.com/role/StatementCondensedConsolidatedBalanceSheetsParenthetical CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) Statements 3 false false R4.htm 995200200 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS Sheet http://www.cytosorbents.com/role/StatementCondensedConsolidatedStatementsOfOperationsAndComprehensiveLoss CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS Statements 4 false false R5.htm 995200300 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (DEFICIT) Sheet http://www.cytosorbents.com/role/StatementCondensedConsolidatedStatementsOfChangesInStockholdersEquityDeficit CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (DEFICIT) Statements 5 false false R6.htm 995200400 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS Sheet http://www.cytosorbents.com/role/StatementCondensedConsolidatedStatementsOfCashFlows CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS Statements 6 false false R7.htm 995210101 - Disclosure - NATURE OF BUSINESS AND BASIS OF PRESENTATION Sheet http://www.cytosorbents.com/role/DisclosureNatureOfBusinessAndBasisOfPresentation NATURE OF BUSINESS AND BASIS OF PRESENTATION Notes 7 false false R8.htm 995210201 - Disclosure - SIGNIFICANT ACCOUNTING POLICIES Sheet http://www.cytosorbents.com/role/DisclosureSignificantAccountingPolicies SIGNIFICANT ACCOUNTING POLICIES Notes 8 false false R9.htm 995210301 - Disclosure - BALANCE SHEET COMPONENTS Sheet http://www.cytosorbents.com/role/DisclosureBalanceSheetComponents BALANCE SHEET COMPONENTS Notes 9 false false R10.htm 995210401 - Disclosure - COMMON STOCK, STOCK-BASED COMPENSATION AND WARRANTS Sheet http://www.cytosorbents.com/role/DisclosureCommonStockStockBasedCompensationAndWarrants COMMON STOCK, STOCK-BASED COMPENSATION AND WARRANTS Notes 10 false false R11.htm 995210501 - Disclosure - REVENUE Sheet http://www.cytosorbents.com/role/DisclosureRevenue REVENUE Notes 11 false false R12.htm 995210601 - Disclosure - LONG-TERM DEBT Sheet http://www.cytosorbents.com/role/DisclosureLongTermDebt LONG-TERM DEBT Notes 12 false false R13.htm 995210701 - Disclosure - COMMITMENTS AND CONTINGENCIES Sheet http://www.cytosorbents.com/role/DisclosureCommitmentsAndContingencies COMMITMENTS AND CONTINGENCIES Notes 13 false false R14.htm 995210801 - Disclosure - LEASES Sheet http://www.cytosorbents.com/role/DisclosureLeases LEASES Notes 14 false false R15.htm 995210901 - Disclosure - NET INCOME (LOSS) PER SHARE Sheet http://www.cytosorbents.com/role/DisclosureNetIncomeLossPerShare NET INCOME (LOSS) PER SHARE Notes 15 false false R16.htm 995211001 - Disclosure - SEGMENT INFORMATION Sheet http://www.cytosorbents.com/role/DisclosureSegmentInformation SEGMENT INFORMATION Notes 16 false false R17.htm 995211101 - Disclosure - RESTRUCTURING Sheet http://www.cytosorbents.com/role/DisclosureRestructuring RESTRUCTURING Notes 17 false false R18.htm 995211201 - Disclosure - SUBSEQUENT EVENTS Sheet http://www.cytosorbents.com/role/DisclosureSubsequentEvents SUBSEQUENT EVENTS Notes 18 false false R19.htm 995410 - Disclosure - Pay vs Performance Disclosure Sheet http://xbrl.sec.gov/ecd/role/PvpDisclosure Pay vs Performance Disclosure Notes 19 false false R20.htm 995445 - Disclosure - Insider Trading Arrangements Sheet http://xbrl.sec.gov/ecd/role/InsiderTradingArrangements Insider Trading Arrangements Notes 20 false false R21.htm 99920202 - Disclosure - SIGNIFICANT ACCOUNTING POLICIES (Policies) Sheet http://www.cytosorbents.com/role/DisclosureSignificantAccountingPoliciesPolicies SIGNIFICANT ACCOUNTING POLICIES (Policies) Policies 21 false false R22.htm 99930303 - Disclosure - BALANCE SHEET COMPONENTS (Tables) Sheet http://www.cytosorbents.com/role/DisclosureBalanceSheetComponentsTables BALANCE SHEET COMPONENTS (Tables) Tables http://www.cytosorbents.com/role/DisclosureBalanceSheetComponents 22 false false R23.htm 99930403 - Disclosure - COMMON STOCK, STOCK-BASED COMPENSATION AND WARRANTS (Tables) Sheet http://www.cytosorbents.com/role/DisclosureCommonStockStockBasedCompensationAndWarrantsTables COMMON STOCK, STOCK-BASED COMPENSATION AND WARRANTS (Tables) Tables http://www.cytosorbents.com/role/DisclosureCommonStockStockBasedCompensationAndWarrants 23 false false R24.htm 99930503 - Disclosure - REVENUE (Tables) Sheet http://www.cytosorbents.com/role/DisclosureRevenueTables REVENUE (Tables) Tables http://www.cytosorbents.com/role/DisclosureRevenue 24 false false R25.htm 99930603 - Disclosure - LONG-TERM DEBT (Tables) Sheet http://www.cytosorbents.com/role/DisclosureLongTermDebtTables LONG-TERM DEBT (Tables) Tables http://www.cytosorbents.com/role/DisclosureLongTermDebt 25 false false R26.htm 99930803 - Disclosure - LEASES (Tables) Sheet http://www.cytosorbents.com/role/DisclosureLeasesTables LEASES (Tables) Tables http://www.cytosorbents.com/role/DisclosureLeases 26 false false R27.htm 99930903 - Disclosure - NET INCOME (LOSS) PER SHARE (Tables) Sheet http://www.cytosorbents.com/role/DisclosureNetIncomeLossPerShareTables NET INCOME (LOSS) PER SHARE (Tables) Tables http://www.cytosorbents.com/role/DisclosureNetIncomeLossPerShare 27 false false R28.htm 99931003 - Disclosure - SEGMENT INFORMATION (Tables) Sheet http://www.cytosorbents.com/role/DisclosureSegmentInformationTables SEGMENT INFORMATION (Tables) Tables http://www.cytosorbents.com/role/DisclosureSegmentInformation 28 false false R29.htm 99931103 - Disclosure - RESTRUCTURING (Tables) Sheet http://www.cytosorbents.com/role/DisclosureRestructuringTables RESTRUCTURING (Tables) Tables http://www.cytosorbents.com/role/DisclosureRestructuring 29 false false R30.htm 99940101 - Disclosure - NATURE OF BUSINESS AND BASIS OF PRESENTATION (Details) Sheet http://www.cytosorbents.com/role/DisclosureNatureOfBusinessAndBasisOfPresentationDetails NATURE OF BUSINESS AND BASIS OF PRESENTATION (Details) Details http://www.cytosorbents.com/role/DisclosureNatureOfBusinessAndBasisOfPresentation 30 false false R31.htm 99940201 - Disclosure - SIGNIFICANT ACCOUNTING POLICIES (Details) Sheet http://www.cytosorbents.com/role/DisclosureSignificantAccountingPoliciesDetails SIGNIFICANT ACCOUNTING POLICIES (Details) Details http://www.cytosorbents.com/role/DisclosureSignificantAccountingPoliciesPolicies 31 false false R32.htm 99940301 - Disclosure - BALANCE SHEET COMPONENTS - Cash, cash equivalents, and restricted cash (Details) Sheet http://www.cytosorbents.com/role/DisclosureBalanceSheetComponentsCashCashEquivalentsAndRestrictedCashDetails BALANCE SHEET COMPONENTS - Cash, cash equivalents, and restricted cash (Details) Details 32 false false R33.htm 99940302 - Disclosure - BALANCE SHEET COMPONENTS - Inventories - net (Details) Sheet http://www.cytosorbents.com/role/DisclosureBalanceSheetComponentsInventoriesNetDetails BALANCE SHEET COMPONENTS - Inventories - net (Details) Details 33 false false R34.htm 99940303 - Disclosure - BALANCE SHEET COMPONENTS - Property and equipment, net (Details) Sheet http://www.cytosorbents.com/role/DisclosureBalanceSheetComponentsPropertyAndEquipmentNetDetails BALANCE SHEET COMPONENTS - Property and equipment, net (Details) Details 34 false false R35.htm 99940304 - Disclosure - BALANCE SHEET COMPONENTS - Patents - net (Details) Sheet http://www.cytosorbents.com/role/DisclosureBalanceSheetComponentsPatentsNetDetails BALANCE SHEET COMPONENTS - Patents - net (Details) Details 35 false false R36.htm 99940305 - Disclosure - BALANCE SHEET COMPONENTS - Patent amortization expense (Details) Sheet http://www.cytosorbents.com/role/DisclosureBalanceSheetComponentsPatentAmortizationExpenseDetails BALANCE SHEET COMPONENTS - Patent amortization expense (Details) Details 36 false false R37.htm 99940306 - Disclosure - BALANCE SHEET COMPONENTS - Accrued expenses and other current liabilities (Details) Sheet http://www.cytosorbents.com/role/DisclosureBalanceSheetComponentsAccruedExpensesAndOtherCurrentLiabilitiesDetails BALANCE SHEET COMPONENTS - Accrued expenses and other current liabilities (Details) Details 37 false false R38.htm 99940401 - Disclosure - COMMON STOCK, STOCK-BASED COMPENSATION AND WARRANTS - January 10, 2025 Rights Offering (Details) Sheet http://www.cytosorbents.com/role/DisclosureCommonStockStockBasedCompensationAndWarrantsJanuary102025RightsOfferingDetails COMMON STOCK, STOCK-BASED COMPENSATION AND WARRANTS - January 10, 2025 Rights Offering (Details) Details 38 false false R39.htm 99940402 - Disclosure - COMMON STOCK, STOCK-BASED COMPENSATION AND WARRANTS - Rights Offering Warrants value assumptions (Details) Sheet http://www.cytosorbents.com/role/DisclosureCommonStockStockBasedCompensationAndWarrantsRightsOfferingWarrantsValueAssumptionsDetails COMMON STOCK, STOCK-BASED COMPENSATION AND WARRANTS - Rights Offering Warrants value assumptions (Details) Details 39 false false R40.htm 99940403 - Disclosure - COMMON STOCK, STOCK-BASED COMPENSATION AND WARRANTS - Stock-Based Compensation (Details) Sheet http://www.cytosorbents.com/role/DisclosureCommonStockStockBasedCompensationAndWarrantsStockBasedCompensationDetails COMMON STOCK, STOCK-BASED COMPENSATION AND WARRANTS - Stock-Based Compensation (Details) Details 40 false false R41.htm 99940404 - Disclosure - COMMON STOCK, STOCK-BASED COMPENSATION AND WARRANTS - Stock option activity (Details) Sheet http://www.cytosorbents.com/role/DisclosureCommonStockStockBasedCompensationAndWarrantsStockOptionActivityDetails COMMON STOCK, STOCK-BASED COMPENSATION AND WARRANTS - Stock option activity (Details) Details 41 false false R42.htm 99940405 - Disclosure - COMMON STOCK, STOCK-BASED COMPENSATION AND WARRANTS - Fair value of stock-options (Details) Sheet http://www.cytosorbents.com/role/DisclosureCommonStockStockBasedCompensationAndWarrantsFairValueOfStockOptionsDetails COMMON STOCK, STOCK-BASED COMPENSATION AND WARRANTS - Fair value of stock-options (Details) Details 42 false false R43.htm 99940406 - Disclosure - COMMON STOCK, STOCK-BASED COMPENSATION AND WARRANTS - Intrinsic value (Details) Sheet http://www.cytosorbents.com/role/DisclosureCommonStockStockBasedCompensationAndWarrantsIntrinsicValueDetails COMMON STOCK, STOCK-BASED COMPENSATION AND WARRANTS - Intrinsic value (Details) Details 43 false false R44.htm 99940407 - Disclosure - COMMON STOCK, STOCK-BASED COMPENSATION AND WARRANTS - Non-vested options (Details) Sheet http://www.cytosorbents.com/role/DisclosureCommonStockStockBasedCompensationAndWarrantsNonVestedOptionsDetails COMMON STOCK, STOCK-BASED COMPENSATION AND WARRANTS - Non-vested options (Details) Details 44 false false R45.htm 99940408 - Disclosure - COMMON STOCK, STOCK-BASED COMPENSATION AND WARRANTS - Restricted stock unit activity (Details) Sheet http://www.cytosorbents.com/role/DisclosureCommonStockStockBasedCompensationAndWarrantsRestrictedStockUnitActivityDetails COMMON STOCK, STOCK-BASED COMPENSATION AND WARRANTS - Restricted stock unit activity (Details) Details 45 false false R46.htm 99940409 - Disclosure - COMMON STOCK, STOCK-BASED COMPENSATION AND WARRANTS - Narrative (Details) Sheet http://www.cytosorbents.com/role/DisclosureCommonStockStockBasedCompensationAndWarrantsNarrativeDetails COMMON STOCK, STOCK-BASED COMPENSATION AND WARRANTS - Narrative (Details) Details http://www.cytosorbents.com/role/DisclosureCommonStockStockBasedCompensationAndWarrantsTables 46 false false R47.htm 99940410 - Disclosure - COMMON STOCK, STOCK-BASED COMPENSATION AND WARRANTS - Warrants (Details) Sheet http://www.cytosorbents.com/role/DisclosureCommonStockStockBasedCompensationAndWarrantsWarrantsDetails COMMON STOCK, STOCK-BASED COMPENSATION AND WARRANTS - Warrants (Details) Details http://www.cytosorbents.com/role/DisclosureCommonStockStockBasedCompensationAndWarrantsTables 47 false false R48.htm 99940501 - Disclosure - REVENUE - Revenue by customer type and geographic area (Details) Sheet http://www.cytosorbents.com/role/DisclosureRevenueRevenueByCustomerTypeAndGeographicAreaDetails REVENUE - Revenue by customer type and geographic area (Details) Details 48 false false R49.htm 99940502 - Disclosure - REVENUE - Receivables and contract liabilities (Details) Sheet http://www.cytosorbents.com/role/DisclosureRevenueReceivablesAndContractLiabilitiesDetails REVENUE - Receivables and contract liabilities (Details) Details 49 false false R50.htm 99940601 - Disclosure - LONG-TERM DEBT - Avenue Capital Group (Details) Sheet http://www.cytosorbents.com/role/DisclosureLongTermDebtAvenueCapitalGroupDetails LONG-TERM DEBT - Avenue Capital Group (Details) Details 50 false false R51.htm 99940602 - Disclosure - LONG-TERM DEBT - Debt Discounts (Details) Sheet http://www.cytosorbents.com/role/DisclosureLongTermDebtDebtDiscountsDetails LONG-TERM DEBT - Debt Discounts (Details) Details 51 false false R52.htm 99940603 - Disclosure - LONG-TERM DEBT - Summary (Details) Sheet http://www.cytosorbents.com/role/DisclosureLongTermDebtSummaryDetails LONG-TERM DEBT - Summary (Details) Details 52 false false R53.htm 99940604 - Disclosure - LONG-TERM DEBT - Principal payments (Details) Sheet http://www.cytosorbents.com/role/DisclosureLongTermDebtPrincipalPaymentsDetails LONG-TERM DEBT - Principal payments (Details) Details 53 false false R54.htm 99940605 - Disclosure - LONG-TERM DEBT - 2022 Success Fee Letter (Details) Sheet http://www.cytosorbents.com/role/DisclosureLongTermDebt2022SuccessFeeLetterDetails LONG-TERM DEBT - 2022 Success Fee Letter (Details) Details 54 false false R55.htm 99940701 - Disclosure - COMMITMENTS AND CONTINGENCIES - Royalty Agreements (Details) Sheet http://www.cytosorbents.com/role/DisclosureCommitmentsAndContingenciesRoyaltyAgreementsDetails COMMITMENTS AND CONTINGENCIES - Royalty Agreements (Details) Details 55 false false R56.htm 99940702 - Disclosure - COMMITMENTS AND CONTINGENCIES - 401 (k) Plan (Details) Sheet http://www.cytosorbents.com/role/DisclosureCommitmentsAndContingencies401KPlanDetails COMMITMENTS AND CONTINGENCIES - 401 (k) Plan (Details) Details http://www.cytosorbents.com/role/DisclosureCommitmentsAndContingencies 56 false false R57.htm 99940801 - Disclosure - LEASES (Details) Sheet http://www.cytosorbents.com/role/DisclosureLeasesDetails LEASES (Details) Details http://www.cytosorbents.com/role/DisclosureLeasesTables 57 false false R58.htm 99940802 - Disclosure - LEASES - Supplemental (Details) Sheet http://www.cytosorbents.com/role/DisclosureLeasesSupplementalDetails LEASES - Supplemental (Details) Details 58 false false R59.htm 99940803 - Disclosure - LEASES - Right-of- use asset and related lease liability (Details) Sheet http://www.cytosorbents.com/role/DisclosureLeasesRightOfUseAssetAndRelatedLeaseLiabilityDetails LEASES - Right-of- use asset and related lease liability (Details) Details 59 false false R60.htm 99940804 - Disclosure - LEASES - Lease Expense (Details) Sheet http://www.cytosorbents.com/role/DisclosureLeasesLeaseExpenseDetails LEASES - Lease Expense (Details) Details 60 false false R61.htm 99940805 - Disclosure - LEASES - Maturities of the lease liabilities (Details) Sheet http://www.cytosorbents.com/role/DisclosureLeasesMaturitiesOfLeaseLiabilitiesDetails LEASES - Maturities of the lease liabilities (Details) Details 61 false false R62.htm 99940901 - Disclosure - NET INCOME (LOSS) PER SHARE (Details) Sheet http://www.cytosorbents.com/role/DisclosureNetIncomeLossPerShareDetails NET INCOME (LOSS) PER SHARE (Details) Details http://www.cytosorbents.com/role/DisclosureNetIncomeLossPerShareTables 62 false false R63.htm 99940902 - Disclosure - NET INCOME (LOSS) PER SHARE - Computation of diluted net loss per share (Details) Sheet http://www.cytosorbents.com/role/DisclosureNetIncomeLossPerShareComputationOfDilutedNetLossPerShareDetails NET INCOME (LOSS) PER SHARE - Computation of diluted net loss per share (Details) Details http://www.cytosorbents.com/role/DisclosureNetIncomeLossPerShareTables 63 false false R64.htm 99941001 - Disclosure - SEGMENT INFORMATION (Details) Sheet http://www.cytosorbents.com/role/DisclosureSegmentInformationDetails SEGMENT INFORMATION (Details) Details http://www.cytosorbents.com/role/DisclosureSegmentInformationTables 64 false false R65.htm 99941002 - Disclosure - SEGMENT INFORMATION - Components of the Company single operating segment (Details) Sheet http://www.cytosorbents.com/role/DisclosureSegmentInformationComponentsOfCompanySingleOperatingSegmentDetails SEGMENT INFORMATION - Components of the Company single operating segment (Details) Details 65 false false R66.htm 99941003 - Disclosure - SEGMENT INFORMATION - Significant expense categories (Details) Sheet http://www.cytosorbents.com/role/DisclosureSegmentInformationSignificantExpenseCategoriesDetails SEGMENT INFORMATION - Significant expense categories (Details) Details 66 false false R67.htm 99941101 - Disclosure - RESTRUCTURING (Details) Sheet http://www.cytosorbents.com/role/DisclosureRestructuringDetails RESTRUCTURING (Details) Details http://www.cytosorbents.com/role/DisclosureRestructuringTables 67 false false R68.htm 99941102 - Disclosure - RESTRUCTURING - Unpaid restructuring charges (Details) Sheet http://www.cytosorbents.com/role/DisclosureRestructuringUnpaidRestructuringChargesDetails RESTRUCTURING - Unpaid restructuring charges (Details) Details 68 false false All Reports Book All Reports ctso-20260630.xsd ctso-20260630_cal.xml ctso-20260630_def.xml ctso-20260630_lab.xml ctso-20260630_pre.xml ctso-20260630x10q.htm http://fasb.org/us-gaap/2026 http://xbrl.sec.gov/dei/2026 http://xbrl.sec.gov/ecd/2026 true true