3.26.1 html 252 396 1 false 96 0 false 4 false false R1.htm 000001 - Document - Cover Sheet http://class.com/role/Cover Cover Cover 1 false false R2.htm 110200 - Statement - CONSOLIDATED BALANCE SHEETS Sheet http://class.com/role/ConsolidatedBalanceSheets CONSOLIDATED BALANCE SHEETS Statements 2 false false R3.htm 110201 - Statement - CONSOLIDATED BALANCE SHEETS (Parenthetical) Sheet http://class.com/role/ConsolidatedBalanceSheetsParenthetical CONSOLIDATED BALANCE SHEETS (Parenthetical) Statements 3 false false R4.htm 124100 - Statement - CONSOLIDATED STATEMENTS OF OPERATIONS Sheet http://class.com/role/ConsolidatedStatementsOfOperations CONSOLIDATED STATEMENTS OF OPERATIONS Statements 4 false false R5.htm 148600 - Statement - CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS EQUITY (DEFICIT) Sheet http://class.com/role/ConsolidatedStatementsOfChangesInShareholdersEquityDeficit CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS EQUITY (DEFICIT) Statements 5 false false R6.htm 170000 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS Sheet http://class.com/role/ConsolidatedStatementsOfCashFlows CONSOLIDATED STATEMENTS OF CASH FLOWS Statements 6 false false R7.htm 170001 - Disclosure - Insider Trading Arrangements Sheet http://class.com/role/InsiderTradingArrangements Insider Trading Arrangements Notes 7 false false R8.htm 995550 - Disclosure - Cybersecurity Risk Management and Strategy Disclosure Sheet http://xbrl.sec.gov/cyd/role/CybersecurityRiskManagementAndStrategyDisclosure Cybersecurity Risk Management and Strategy Disclosure Notes 8 false false R9.htm 995551 - Disclosure - Description of the Business and Basis of Presentation Sheet http://class.com/role/DescriptionOfTheBusinessAndBasisOfPresentation Description of the Business and Basis of Presentation Notes 9 false false R10.htm 995552 - Disclosure - Summary of Significant Accounting Policies Sheet http://class.com/role/SummaryOfSignificantAccountingPolicies Summary of Significant Accounting Policies Notes 10 false false R11.htm 995553 - Disclosure - Property and Equipment, net Sheet http://class.com/role/PropertyAndEquipmentNet Property and Equipment, net Notes 11 false false R12.htm 995554 - Disclosure - Investment accounts Sheet http://class.com/role/InvestmentAccounts Investment accounts Notes 12 false false R13.htm 995555 - Disclosure - Intangible Assets Sheet http://class.com/role/IntangibleAssets Intangible Assets Notes 13 false false R14.htm 995556 - Disclosure - Leases Sheet http://class.com/role/Leases Leases Notes 14 false false R15.htm 995557 - Disclosure - Accrued Liabilities and Other Payables Sheet http://class.com/role/AccruedLiabilitiesAndOtherPayables Accrued Liabilities and Other Payables Notes 15 false false R16.htm 995558 - Disclosure - Income Taxes Sheet http://class.com/role/IncomeTaxes Income Taxes Notes 16 false false R17.htm 995559 - Disclosure - Related parties Sheet http://class.com/role/RelatedParties Related parties Notes 17 false false R18.htm 995560 - Disclosure - Convertible notes Notes http://class.com/role/ConvertibleNotes Convertible notes Notes 18 false false R19.htm 995561 - Disclosure - Warrant Liabilities Sheet http://class.com/role/WarrantLiabilities Warrant Liabilities Notes 19 false false R20.htm 995562 - Disclosure - Recurring fair value measurements Sheet http://class.com/role/RecurringFairValueMeasurements Recurring fair value measurements Notes 20 false false R21.htm 995563 - Disclosure - Segment information and revenue analysis Sheet http://class.com/role/SegmentInformationAndRevenueAnalysis Segment information and revenue analysis Notes 21 false false R22.htm 995564 - Disclosure - Commitments and Contingencies Sheet http://class.com/role/CommitmentsAndContingencies Commitments and Contingencies Notes 22 false false R23.htm 995565 - Disclosure - Equity Sheet http://class.com/role/Equity Equity Notes 23 false false R24.htm 995566 - Disclosure - Concentration of risk Sheet http://class.com/role/ConcentrationOfRisk Concentration of risk Notes 24 false false R25.htm 995567 - Disclosure - Subsequent Event Sheet http://class.com/role/SubsequentEvent Subsequent Event Notes 25 false false R26.htm 995568 - Disclosure - Summary of Significant Accounting Policies (Policies) Sheet http://class.com/role/SummaryOfSignificantAccountingPoliciesPolicies Summary of Significant Accounting Policies (Policies) Policies http://class.com/role/SummaryOfSignificantAccountingPolicies 26 false false R27.htm 995569 - Disclosure - Summary of Significant Accounting Policies (Tables) Sheet http://class.com/role/SummaryOfSignificantAccountingPoliciesTables Summary of Significant Accounting Policies (Tables) Tables http://class.com/role/SummaryOfSignificantAccountingPolicies 27 false false R28.htm 995570 - Disclosure - Property and Equipment, net (Tables) Sheet http://class.com/role/PropertyAndEquipmentNetTables Property and Equipment, net (Tables) Tables http://class.com/role/PropertyAndEquipmentNet 28 false false R29.htm 995571 - Disclosure - Investment accounts (Tables) Sheet http://class.com/role/InvestmentAccountsTables Investment accounts (Tables) Tables http://class.com/role/InvestmentAccounts 29 false false R30.htm 995572 - Disclosure - Intangible Assets (Tables) Sheet http://class.com/role/IntangibleAssetsTables Intangible Assets (Tables) Tables http://class.com/role/IntangibleAssets 30 false false R31.htm 995573 - Disclosure - Leases (Tables) Sheet http://class.com/role/LeasesTables Leases (Tables) Tables http://class.com/role/Leases 31 false false R32.htm 995574 - Disclosure - Accrued Liabilities and Other Payables (Tables) Sheet http://class.com/role/AccruedLiabilitiesAndOtherPayablesTables Accrued Liabilities and Other Payables (Tables) Tables http://class.com/role/AccruedLiabilitiesAndOtherPayables 32 false false R33.htm 995575 - Disclosure - Income Taxes (Tables) Sheet http://class.com/role/IncomeTaxesTables Income Taxes (Tables) Tables http://class.com/role/IncomeTaxes 33 false false R34.htm 995576 - Disclosure - Related parties (Tables) Sheet http://class.com/role/RelatedPartiesTables Related parties (Tables) Tables http://class.com/role/RelatedParties 34 false false R35.htm 995577 - Disclosure - Convertible notes (Tables) Notes http://class.com/role/ConvertibleNotesTables Convertible notes (Tables) Tables http://class.com/role/ConvertibleNotes 35 false false R36.htm 995578 - Disclosure - Warrant Liabilities (Tables) Sheet http://class.com/role/WarrantLiabilitiesTables Warrant Liabilities (Tables) Tables http://class.com/role/WarrantLiabilities 36 false false R37.htm 995579 - Disclosure - Recurring fair value measurements (Tables) Sheet http://class.com/role/RecurringFairValueMeasurementsTables Recurring fair value measurements (Tables) Tables http://class.com/role/RecurringFairValueMeasurements 37 false false R38.htm 995580 - Disclosure - Segment information and revenue analysis (Tables) Sheet http://class.com/role/SegmentInformationAndRevenueAnalysisTables Segment information and revenue analysis (Tables) Tables http://class.com/role/SegmentInformationAndRevenueAnalysis 38 false false R39.htm 995581 - Disclosure - Equity (Tables) Sheet http://class.com/role/EquityTables Equity (Tables) Tables http://class.com/role/Equity 39 false false R40.htm 995582 - Disclosure - Description of the Business and Basis of Presentation (Details Narrative) Sheet http://class.com/role/DescriptionOfTheBusinessAndBasisOfPresentationDetailsNarrative Description of the Business and Basis of Presentation (Details Narrative) Details http://class.com/role/DescriptionOfTheBusinessAndBasisOfPresentation 40 false false R41.htm 995583 - Disclosure - Summary of Significant Accounting Policies (Details) Sheet http://class.com/role/SummaryOfSignificantAccountingPoliciesDetails Summary of Significant Accounting Policies (Details) Details http://class.com/role/SummaryOfSignificantAccountingPoliciesTables 41 false false R42.htm 995584 - Disclosure - Summary of Significant Accounting Policies (Details Narrative) Sheet http://class.com/role/SummaryOfSignificantAccountingPoliciesDetailsNarrative Summary of Significant Accounting Policies (Details Narrative) Details http://class.com/role/SummaryOfSignificantAccountingPoliciesTables 42 false false R43.htm 995585 - Disclosure - Property and Equipment, net (Details) Sheet http://class.com/role/PropertyAndEquipmentNetDetails Property and Equipment, net (Details) Details http://class.com/role/PropertyAndEquipmentNetTables 43 false false R44.htm 995586 - Disclosure - Property and Equipment, net (Details Narrative) Sheet http://class.com/role/PropertyAndEquipmentNetDetailsNarrative Property and Equipment, net (Details Narrative) Details http://class.com/role/PropertyAndEquipmentNetTables 44 false false R45.htm 995587 - Disclosure - Investment accounts (Details) Sheet http://class.com/role/InvestmentAccountsDetails Investment accounts (Details) Details http://class.com/role/InvestmentAccountsTables 45 false false R46.htm 995588 - Disclosure - Investment accounts (Details Narrative) Sheet http://class.com/role/InvestmentAccountsDetailsNarrative Investment accounts (Details Narrative) Details http://class.com/role/InvestmentAccountsTables 46 false false R47.htm 995589 - Disclosure - Intangible Assets (Details) Sheet http://class.com/role/IntangibleAssetsDetails Intangible Assets (Details) Details http://class.com/role/IntangibleAssetsTables 47 false false R48.htm 995590 - Disclosure - Intangible Assets (Details Narrative) Sheet http://class.com/role/IntangibleAssetsDetailsNarrative Intangible Assets (Details Narrative) Details http://class.com/role/IntangibleAssetsTables 48 false false R49.htm 995591 - Disclosure - Leases (Details) Sheet http://class.com/role/LeasesDetails Leases (Details) Details http://class.com/role/LeasesTables 49 false false R50.htm 995592 - Disclosure - Leases (Details 1) Sheet http://class.com/role/LeasesDetails1 Leases (Details 1) Details http://class.com/role/LeasesTables 50 false false R51.htm 995593 - Disclosure - Leases (Details Narrative) Sheet http://class.com/role/LeasesDetailsNarrative Leases (Details Narrative) Details http://class.com/role/LeasesTables 51 false false R52.htm 995594 - Disclosure - Accrued Liabilities and Other Payables (Details) Sheet http://class.com/role/AccruedLiabilitiesAndOtherPayablesDetails Accrued Liabilities and Other Payables (Details) Details http://class.com/role/AccruedLiabilitiesAndOtherPayablesTables 52 false false R53.htm 995595 - Disclosure - Income Taxes (Details) Sheet http://class.com/role/IncomeTaxesDetails Income Taxes (Details) Details http://class.com/role/IncomeTaxesTables 53 false false R54.htm 995596 - Disclosure - Income Taxes (Details 1) Sheet http://class.com/role/IncomeTaxesDetails1 Income Taxes (Details 1) Details http://class.com/role/IncomeTaxesTables 54 false false R55.htm 995597 - Disclosure - Income Taxes (Details 2) Sheet http://class.com/role/IncomeTaxesDetails2 Income Taxes (Details 2) Details http://class.com/role/IncomeTaxesTables 55 false false R56.htm 995598 - Disclosure - Income Taxes (Details Narrative) Sheet http://class.com/role/IncomeTaxesDetailsNarrative Income Taxes (Details Narrative) Details http://class.com/role/IncomeTaxesTables 56 false false R57.htm 995599 - Disclosure - Related parties (Details) Sheet http://class.com/role/RelatedPartiesDetails Related parties (Details) Details http://class.com/role/RelatedPartiesTables 57 false false R58.htm 995600 - Disclosure - Related parties (Details 1) Sheet http://class.com/role/RelatedPartiesDetails1 Related parties (Details 1) Details http://class.com/role/RelatedPartiesTables 58 false false R59.htm 995601 - Disclosure - Related parties (Details 2) Sheet http://class.com/role/RelatedPartiesDetails2 Related parties (Details 2) Details http://class.com/role/RelatedPartiesTables 59 false false R60.htm 995602 - Disclosure - Related parties (Details 3) Sheet http://class.com/role/RelatedPartiesDetails3 Related parties (Details 3) Details http://class.com/role/RelatedPartiesTables 60 false false R61.htm 995603 - Disclosure - Convertible Notes Payable (Details) Notes http://class.com/role/ConvertibleNotesPayableDetails Convertible Notes Payable (Details) Details 61 false false R62.htm 995604 - Disclosure - Convertible Notes Payable (Details 1) Notes http://class.com/role/ConvertibleNotesPayableDetails1 Convertible Notes Payable (Details 1) Details 62 false false R63.htm 995605 - Disclosure - Convertible Notes Payable (Details 2) Notes http://class.com/role/ConvertibleNotesPayableDetails2 Convertible Notes Payable (Details 2) Details 63 false false R64.htm 995606 - Disclosure - Convertible Notes Payable (Details 3) Notes http://class.com/role/ConvertibleNotesPayableDetails3 Convertible Notes Payable (Details 3) Details 64 false false R65.htm 995607 - Disclosure - Convertible Notes Payable (Details Narrative) Notes http://class.com/role/ConvertibleNotesPayableDetailsNarrative Convertible Notes Payable (Details Narrative) Details 65 false false R66.htm 995608 - Disclosure - Warrant Liabilities (Details) Sheet http://class.com/role/WarrantLiabilitiesDetails Warrant Liabilities (Details) Details http://class.com/role/WarrantLiabilitiesTables 66 false false R67.htm 995609 - Disclosure - Warrant Liabilities (Details Narrative) Sheet http://class.com/role/WarrantLiabilitiesDetailsNarrative Warrant Liabilities (Details Narrative) Details http://class.com/role/WarrantLiabilitiesTables 67 false false R68.htm 995610 - Disclosure - Recurring fair value measurements (Details) Sheet http://class.com/role/RecurringFairValueMeasurementsDetails Recurring fair value measurements (Details) Details http://class.com/role/RecurringFairValueMeasurementsTables 68 false false R69.htm 995611 - Disclosure - Segment information and revenue analysis (Details) Sheet http://class.com/role/SegmentInformationAndRevenueAnalysisDetails Segment information and revenue analysis (Details) Details http://class.com/role/SegmentInformationAndRevenueAnalysisTables 69 false false R70.htm 995612 - Disclosure - Equity (Details) Sheet http://class.com/role/EquityDetails Equity (Details) Details http://class.com/role/EquityTables 70 false false R71.htm 995613 - Disclosure - Equity (Details Narrative) Sheet http://class.com/role/EquityDetailsNarrative Equity (Details Narrative) Details http://class.com/role/EquityTables 71 false false R72.htm 995614 - Disclosure - Concentration of risk (Details Narrative) Sheet http://class.com/role/ConcentrationOfRiskDetailsNarrative Concentration of risk (Details Narrative) Details http://class.com/role/ConcentrationOfRisk 72 false false R73.htm 995615 - Disclosure - Subsequent Event (Details Narrative) Sheet http://class.com/role/SubsequentEventDetailsNarrative Subsequent Event (Details Narrative) Details http://class.com/role/SubsequentEvent 73 false false All Reports Book All Reports class-20251231.xsd class-20251231_cal.xml class-20251231_def.xml class-20251231_lab.xml class-20251231_pre.xml class_10k.htm class_10kimg1.jpg class_10kimg2.jpg class_10kimg3.jpg class_10kimg4.jpg class_10kimg5.jpg class_10kimg6.jpg class_10kimg7.jpg class_10kimg8.jpg http://fasb.org/us-gaap/2025 http://xbrl.sec.gov/cyd/2025 http://xbrl.sec.gov/dei/2025 http://xbrl.sec.gov/ecd/2025 true true