3.20.1 html 104 290 1 false 27 0 false 5 false false R1.htm 00090 - Document - Document and Entity Information Sheet http://www.cyclacel.com/role/DocumentDocumentAndEntityInformation Document and Entity Information Cover 1 false false R2.htm 00100 - Statement - CONSOLIDATED BALANCE SHEETS Sheet http://www.cyclacel.com/role/StatementConsolidatedBalanceSheets CONSOLIDATED BALANCE SHEETS Statements 2 false false R3.htm 00105 - Statement - CONSOLIDATED BALANCE SHEETS (Parentheticals) Sheet http://www.cyclacel.com/role/StatementConsolidatedBalanceSheetsParentheticals CONSOLIDATED BALANCE SHEETS (Parentheticals) Statements 3 false false R4.htm 00200 - Statement - CONSOLIDATED STATEMENTS OF OPERATIONS Sheet http://www.cyclacel.com/role/StatementConsolidatedStatementsOfOperations CONSOLIDATED STATEMENTS OF OPERATIONS Statements 4 false false R5.htm 00300 - Statement - CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (Unaudited) Sheet http://www.cyclacel.com/role/StatementConsolidatedStatementsOfComprehensiveLossUnaudited CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (Unaudited) Statements 5 false false R6.htm 00400 - Statement - CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY Sheet http://www.cyclacel.com/role/StatementConsolidatedStatementsOfStockholdersEquity CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY Statements 6 false false R7.htm 00500 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS Sheet http://www.cyclacel.com/role/StatementConsolidatedStatementsOfCashFlows CONSOLIDATED STATEMENTS OF CASH FLOWS Statements 7 false false R8.htm 10101 - Disclosure - Company Overview Sheet http://www.cyclacel.com/role/DisclosureCompanyOverview Company Overview Notes 8 false false R9.htm 10201 - Disclosure - Summary of Significant Accounting Policies Sheet http://www.cyclacel.com/role/DisclosureSummaryOfSignificantAccountingPolicies Summary of Significant Accounting Policies Notes 9 false false R10.htm 10301 - Disclosure - Revenue Sheet http://www.cyclacel.com/role/DisclosureRevenue Revenue Notes 10 false false R11.htm 10401 - Disclosure - Net Loss Per Share Sheet http://www.cyclacel.com/role/DisclosureNetLossPerShare Net Loss Per Share Notes 11 false false R12.htm 10501 - Disclosure - Prepaid Expenses and Other Current Assets Sheet http://www.cyclacel.com/role/DisclosurePrepaidExpensesAndOtherCurrentAssets Prepaid Expenses and Other Current Assets Notes 12 false false R13.htm 10601 - Disclosure - Accrued and Other Liabilities Sheet http://www.cyclacel.com/role/DisclosureAccruedAndOtherLiabilities Accrued and Other Liabilities Notes 13 false false R14.htm 10701 - Disclosure - Leases Sheet http://www.cyclacel.com/role/DisclosureLeases Leases Notes 14 false false R15.htm 10801 - Disclosure - Stock Based Compensation Sheet http://www.cyclacel.com/role/DisclosureStockBasedCompensation Stock Based Compensation Notes 15 false false R16.htm 10901 - Disclosure - Stockholders' Equity Sheet http://www.cyclacel.com/role/DisclosureStockholdersEquity Stockholders' Equity Notes 16 false false R17.htm 11001 - Disclosure - Subsequent Events Sheet http://www.cyclacel.com/role/DisclosureSubsequentEvents Subsequent Events Notes 17 false false R18.htm 20202 - Disclosure - Summary of Significant Accounting Policies (Policies) Sheet http://www.cyclacel.com/role/DisclosureSummaryOfSignificantAccountingPoliciesPolicies Summary of Significant Accounting Policies (Policies) Policies http://www.cyclacel.com/role/DisclosureSummaryOfSignificantAccountingPolicies 18 false false R19.htm 30403 - Disclosure - Net Loss per Common Share (Tables) Sheet http://www.cyclacel.com/role/DisclosureNetLossPerCommonShareTables Net Loss per Common Share (Tables) Tables 19 false false R20.htm 30503 - Disclosure - Prepaid Expenses and Other Current Assets (Tables) Sheet http://www.cyclacel.com/role/DisclosurePrepaidExpensesAndOtherCurrentAssetsTables Prepaid Expenses and Other Current Assets (Tables) Tables http://www.cyclacel.com/role/DisclosurePrepaidExpensesAndOtherCurrentAssets 20 false false R21.htm 30603 - Disclosure - Accrued and Other Liabilities (Tables) Sheet http://www.cyclacel.com/role/DisclosureAccruedAndOtherLiabilitiesTables Accrued and Other Liabilities (Tables) Tables http://www.cyclacel.com/role/DisclosureAccruedAndOtherLiabilities 21 false false R22.htm 30703 - Disclosure - Leases (Tables) Sheet http://www.cyclacel.com/role/DisclosureLeasesTables Leases (Tables) Tables http://www.cyclacel.com/role/DisclosureLeases 22 false false R23.htm 30803 - Disclosure - Stock Based Compensation (Tables) Sheet http://www.cyclacel.com/role/DisclosureStockBasedCompensationTables Stock Based Compensation (Tables) Tables http://www.cyclacel.com/role/DisclosureStockBasedCompensation 23 false false R24.htm 40201 - Disclosure - Summary of Significant Accounting Policies (Narrative) (Details) Sheet http://www.cyclacel.com/role/DisclosureSummaryOfSignificantAccountingPoliciesNarrativeDetails Summary of Significant Accounting Policies (Narrative) (Details) Details http://www.cyclacel.com/role/DisclosureSummaryOfSignificantAccountingPoliciesPolicies 24 false false R25.htm 40301 - Disclosure - Revenue (Narrative) (Details) Sheet http://www.cyclacel.com/role/DisclosureRevenueNarrativeDetails Revenue (Narrative) (Details) Details http://www.cyclacel.com/role/DisclosureRevenue 25 false false R26.htm 40402 - Disclosure - Net Loss per Common Share (Schedule of Company's Potential Anti Dilutive Securities) (Details) Sheet http://www.cyclacel.com/role/DisclosureNetLossPerCommonShareScheduleOfCompanySPotentialAntiDilutiveSecuritiesDetails Net Loss per Common Share (Schedule of Company's Potential Anti Dilutive Securities) (Details) Details http://www.cyclacel.com/role/DisclosureNetLossPerCommonShareTables 26 false false R27.htm 40501 - Disclosure - Prepaid Expenses and Other Current Assets (Narrative) (Details) Sheet http://www.cyclacel.com/role/DisclosurePrepaidExpensesAndOtherCurrentAssetsNarrativeDetails Prepaid Expenses and Other Current Assets (Narrative) (Details) Details http://www.cyclacel.com/role/DisclosurePrepaidExpensesAndOtherCurrentAssetsTables 27 false false R28.htm 40502 - Disclosure - Prepaid Expenses and Other Current Assets (Schedule of Prepaid Expenses and Other Current Assets) (Details) Sheet http://www.cyclacel.com/role/DisclosurePrepaidExpensesAndOtherCurrentAssetsScheduleOfPrepaidExpensesAndOtherCurrentAssetsDetails Prepaid Expenses and Other Current Assets (Schedule of Prepaid Expenses and Other Current Assets) (Details) Details http://www.cyclacel.com/role/DisclosurePrepaidExpensesAndOtherCurrentAssetsTables 28 false false R29.htm 40601 - Disclosure - Accrued and Other Liabilities (Schedule of accrued and other current liabilities) (Details) Sheet http://www.cyclacel.com/role/DisclosureAccruedAndOtherLiabilitiesScheduleOfAccruedAndOtherCurrentLiabilitiesDetails Accrued and Other Liabilities (Schedule of accrued and other current liabilities) (Details) Details http://www.cyclacel.com/role/DisclosureAccruedAndOtherLiabilitiesTables 29 false false R30.htm 40701 - Disclosure - Leases (Narrative) (Details) Sheet http://www.cyclacel.com/role/DisclosureLeasesNarrativeDetails Leases (Narrative) (Details) Details http://www.cyclacel.com/role/DisclosureLeasesTables 30 false false R31.htm 40702 - Disclosure - Leases (Future Minimum Lease Payments) (Details) Sheet http://www.cyclacel.com/role/DisclosureLeasesFutureMinimumLeasePaymentsDetails Leases (Future Minimum Lease Payments) (Details) Details http://www.cyclacel.com/role/DisclosureLeasesTables 31 false false R32.htm 40801 - Disclosure - Stock-Based Compensation (Narrative) (Details) Sheet http://www.cyclacel.com/role/DisclosureStockBasedCompensationNarrativeDetails Stock-Based Compensation (Narrative) (Details) Details 32 false false R33.htm 40802 - Disclosure - Stock Based Compensation (Schedule of Stock Based Compensation Expense) (Details) Sheet http://www.cyclacel.com/role/DisclosureStockBasedCompensationScheduleOfStockBasedCompensationExpenseDetails Stock Based Compensation (Schedule of Stock Based Compensation Expense) (Details) Details http://www.cyclacel.com/role/DisclosureStockBasedCompensationTables 33 false false R34.htm 40803 - Disclosure - Stock-Based Compensation (Schedule of Share Option Activity) (Details) Sheet http://www.cyclacel.com/role/DisclosureStockBasedCompensationScheduleOfShareOptionActivityDetails Stock-Based Compensation (Schedule of Share Option Activity) (Details) Details 34 false false R35.htm 40804 - Disclosure - Stock Based Compensation (Schedule of Restricted Stock Units Activity) (Details) Sheet http://www.cyclacel.com/role/DisclosureStockBasedCompensationScheduleOfRestrictedStockUnitsActivityDetails Stock Based Compensation (Schedule of Restricted Stock Units Activity) (Details) Details http://www.cyclacel.com/role/DisclosureStockBasedCompensationTables 35 false false R36.htm 40901 - Disclosure - Stockholders' Equity (Narrative) (Details) Sheet http://www.cyclacel.com/role/DisclosureStockholdersEquityNarrativeDetails Stockholders' Equity (Narrative) (Details) Details http://www.cyclacel.com/role/DisclosureStockholdersEquity 36 false false R37.htm 41001 - Disclosure - Subsequent Events (Narrative) (Details) Sheet http://www.cyclacel.com/role/DisclosureSubsequentEventsNarrativeDetails Subsequent Events (Narrative) (Details) Details http://www.cyclacel.com/role/DisclosureSubsequentEvents 37 false false All Reports Book All Reports cycc-20200331.xml cycc-20200331.xsd cycc-20200331_cal.xml cycc-20200331_def.xml cycc-20200331_lab.xml cycc-20200331_pre.xml http://fasb.org/us-gaap/2019-01-31 http://xbrl.sec.gov/dei/2019-01-31 http://fasb.org/srt/2019-01-31 true true