3.10.0.1 html 173 214 1 false 56 0 false 6 false false R1.htm 100000 - Document - Document and Entity Information Sheet http://cytokinetics.com/20180930/taxonomy/role/DocumentDocumentAndEntityInformation Document and Entity Information Cover 1 false false R2.htm 100010 - Statement - Condensed Consolidated Balance Sheets (Unaudited) Sheet http://cytokinetics.com/20180930/taxonomy/role/StatementCondensedConsolidatedBalanceSheetsUnaudited Condensed Consolidated Balance Sheets (Unaudited) Statements 2 false false R3.htm 100020 - Statement - Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) Sheet http://cytokinetics.com/20180930/taxonomy/role/StatementCondensedConsolidatedBalanceSheetsUnauditedParenthetical Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) Statements 3 false false R4.htm 100030 - Statement - Condensed Consolidated Statements of Comprehensive Loss (Unaudited) Sheet http://cytokinetics.com/20180930/taxonomy/role/StatementCondensedConsolidatedStatementsOfComprehensiveLossUnaudited Condensed Consolidated Statements of Comprehensive Loss (Unaudited) Statements 4 false false R5.htm 100040 - Statement - Condensed Consolidated Statements of Stockholders' Equity (Unaudited) Sheet http://cytokinetics.com/20180930/taxonomy/role/StatementCondensedConsolidatedStatementsOfStockholdersEquityUnaudited Condensed Consolidated Statements of Stockholders' Equity (Unaudited) Statements 5 false false R6.htm 100050 - Statement - Condensed Consolidated Statements of Cash Flows (Unaudited) Sheet http://cytokinetics.com/20180930/taxonomy/role/StatementCondensedConsolidatedStatementsOfCashFlowsUnaudited Condensed Consolidated Statements of Cash Flows (Unaudited) Statements 6 false false R7.htm 100060 - Disclosure - Organization and Significant Accounting Policies Sheet http://cytokinetics.com/20180930/taxonomy/role/DisclosureOrganizationAndSignificantAccountingPolicies Organization and Significant Accounting Policies Notes 7 false false R8.htm 100070 - Disclosure - Net Loss Per Share Sheet http://cytokinetics.com/20180930/taxonomy/role/DisclosureNetLossPerShare Net Loss Per Share Notes 8 false false R9.htm 100080 - Disclosure - Revenue Recognition Sheet http://cytokinetics.com/20180930/taxonomy/role/DisclosureRevenueRecognition Revenue Recognition Notes 9 false false R10.htm 100090 - Disclosure - Research and Development Arrangements Sheet http://cytokinetics.com/20180930/taxonomy/role/DisclosureResearchAndDevelopmentArrangements Research and Development Arrangements Notes 10 false false R11.htm 100100 - Disclosure - Cash Equivalents and Investments Sheet http://cytokinetics.com/20180930/taxonomy/role/DisclosureCashEquivalentsAndInvestments Cash Equivalents and Investments Notes 11 false false R12.htm 100110 - Disclosure - Fair Value Measurements Sheet http://cytokinetics.com/20180930/taxonomy/role/DisclosureFairValueMeasurements Fair Value Measurements Notes 12 false false R13.htm 100120 - Disclosure - Balance Sheet Components Sheet http://cytokinetics.com/20180930/taxonomy/role/DisclosureBalanceSheetComponents Balance Sheet Components Notes 13 false false R14.htm 100130 - Disclosure - Long-Term Debt Sheet http://cytokinetics.com/20180930/taxonomy/role/DisclosureLongTermDebt Long-Term Debt Notes 14 false false R15.htm 100140 - Disclosure - Liability Related to Sale of Future Royalties Sheet http://cytokinetics.com/20180930/taxonomy/role/DisclosureLiabilityRelatedToSaleOfFutureRoyalties Liability Related to Sale of Future Royalties Notes 15 false false R16.htm 100150 - Disclosure - Stockholders' Equity Sheet http://cytokinetics.com/20180930/taxonomy/role/DisclosureStockholdersEquity Stockholders' Equity Notes 16 false false R17.htm 100160 - Disclosure - Commitments and Contingencies Sheet http://cytokinetics.com/20180930/taxonomy/role/DisclosureCommitmentsAndContingencies Commitments and Contingencies Notes 17 false false R18.htm 100170 - Disclosure - Organization and Significant Accounting Policies (Policies) Sheet http://cytokinetics.com/20180930/taxonomy/role/DisclosureOrganizationAndSignificantAccountingPoliciesPolicies Organization and Significant Accounting Policies (Policies) Policies http://cytokinetics.com/20180930/taxonomy/role/DisclosureOrganizationAndSignificantAccountingPolicies 18 false false R19.htm 100180 - Disclosure - Net Loss Per Share (Tables) Sheet http://cytokinetics.com/20180930/taxonomy/role/DisclosureNetLossPerShareTables Net Loss Per Share (Tables) Tables http://cytokinetics.com/20180930/taxonomy/role/DisclosureNetLossPerShare 19 false false R20.htm 100190 - Disclosure - Revenue Recognition (Tables) Sheet http://cytokinetics.com/20180930/taxonomy/role/DisclosureRevenueRecognitionTables Revenue Recognition (Tables) Tables http://cytokinetics.com/20180930/taxonomy/role/DisclosureRevenueRecognition 20 false false R21.htm 100200 - Disclosure - Research and Development Arrangements (Tables) Sheet http://cytokinetics.com/20180930/taxonomy/role/DisclosureResearchAndDevelopmentArrangementsTables Research and Development Arrangements (Tables) Tables http://cytokinetics.com/20180930/taxonomy/role/DisclosureResearchAndDevelopmentArrangements 21 false false R22.htm 100210 - Disclosure - Cash Equivalents and Investments (Tables) Sheet http://cytokinetics.com/20180930/taxonomy/role/DisclosureCashEquivalentsAndInvestmentsTables Cash Equivalents and Investments (Tables) Tables http://cytokinetics.com/20180930/taxonomy/role/DisclosureCashEquivalentsAndInvestments 22 false false R23.htm 100220 - Disclosure - Fair Value Measurements (Tables) Sheet http://cytokinetics.com/20180930/taxonomy/role/DisclosureFairValueMeasurementsTables Fair Value Measurements (Tables) Tables http://cytokinetics.com/20180930/taxonomy/role/DisclosureFairValueMeasurements 23 false false R24.htm 100230 - Disclosure - Balance Sheet Components (Tables) Sheet http://cytokinetics.com/20180930/taxonomy/role/DisclosureBalanceSheetComponentsTables Balance Sheet Components (Tables) Tables http://cytokinetics.com/20180930/taxonomy/role/DisclosureBalanceSheetComponents 24 false false R25.htm 100240 - Disclosure - Long-Term Debt (Tables) Sheet http://cytokinetics.com/20180930/taxonomy/role/DisclosureLongTermDebtTables Long-Term Debt (Tables) Tables http://cytokinetics.com/20180930/taxonomy/role/DisclosureLongTermDebt 25 false false R26.htm 100250 - Disclosure - Organization and Significant Accounting Policies - Additional Information (Detail) Sheet http://cytokinetics.com/20180930/taxonomy/role/DisclosureOrganizationAndSignificantAccountingPoliciesAdditionalInformationDetail Organization and Significant Accounting Policies - Additional Information (Detail) Details 26 false false R27.htm 100260 - Disclosure - Net Loss Per Share - Instruments Excluded from Diluted Net Loss Per Share (Detail) Sheet http://cytokinetics.com/20180930/taxonomy/role/DisclosureNetLossPerShareInstrumentsExcludedFromDilutedNetLossPerShareDetail Net Loss Per Share - Instruments Excluded from Diluted Net Loss Per Share (Detail) Details 27 false false R28.htm 100270 - Disclosure - Revenue Recognition - Schedule of Revenue Affected by Adopting ASC 606 (Detail) Sheet http://cytokinetics.com/20180930/taxonomy/role/DisclosureRevenueRecognitionScheduleOfRevenueAffectedByAdoptingASC606Detail Revenue Recognition - Schedule of Revenue Affected by Adopting ASC 606 (Detail) Details 28 false false R29.htm 100280 - Disclosure - Revenue Recognition - Schedule of Revenue Impact of Adoption of ASC 606 on Net Loss Per Share (Detail) Sheet http://cytokinetics.com/20180930/taxonomy/role/DisclosureRevenueRecognitionScheduleOfRevenueImpactOfAdoptionOfASC606OnNetLossPerShareDetail Revenue Recognition - Schedule of Revenue Impact of Adoption of ASC 606 on Net Loss Per Share (Detail) Details 29 false false R30.htm 100290 - Disclosure - Revenue Recognition - Schedule of Changes in Contract Assets and Liabilities (Detail) Sheet http://cytokinetics.com/20180930/taxonomy/role/DisclosureRevenueRecognitionScheduleOfChangesInContractAssetsAndLiabilitiesDetail Revenue Recognition - Schedule of Changes in Contract Assets and Liabilities (Detail) Details 30 false false R31.htm 100300 - Disclosure - Research and Development Arrangements - Additional Information (Details) Sheet http://cytokinetics.com/20180930/taxonomy/role/DisclosureResearchAndDevelopmentArrangementsAdditionalInformationDetails Research and Development Arrangements - Additional Information (Details) Details 31 false false R32.htm 100310 - Disclosure - Research and Development Arrangements - Revenues (Detail) Sheet http://cytokinetics.com/20180930/taxonomy/role/DisclosureResearchAndDevelopmentArrangementsRevenuesDetail Research and Development Arrangements - Revenues (Detail) Details 32 false false R33.htm 100320 - Disclosure - Cash Equivalents and Investments - Amortized Cost and Fair Value of Cash Equivalents and Available for Sale Investments (Detail) Sheet http://cytokinetics.com/20180930/taxonomy/role/DisclosureCashEquivalentsAndInvestmentsAmortizedCostAndFairValueOfCashEquivalentsAndAvailableForSaleInvestmentsDetail Cash Equivalents and Investments - Amortized Cost and Fair Value of Cash Equivalents and Available for Sale Investments (Detail) Details 33 false false R34.htm 100330 - Disclosure - Cash Equivalents and Investments - Additional Information (Detail) Sheet http://cytokinetics.com/20180930/taxonomy/role/DisclosureCashEquivalentsAndInvestmentsAdditionalInformationDetail Cash Equivalents and Investments - Additional Information (Detail) Details 34 false false R35.htm 100340 - Disclosure - Fair Value Measurements - Summary of Financial Assets Measured at Fair Value on Recurring Basis (Detail) Sheet http://cytokinetics.com/20180930/taxonomy/role/DisclosureFairValueMeasurementsSummaryOfFinancialAssetsMeasuredAtFairValueOnRecurringBasisDetail Fair Value Measurements - Summary of Financial Assets Measured at Fair Value on Recurring Basis (Detail) Details 35 false false R36.htm 100350 - Disclosure - Fair Value Measurements - Additional Information (Detail) Sheet http://cytokinetics.com/20180930/taxonomy/role/DisclosureFairValueMeasurementsAdditionalInformationDetail Fair Value Measurements - Additional Information (Detail) Details 36 false false R37.htm 100360 - Disclosure - Balance Sheet Components - Summary of Accrued Liabilities (Detail) Sheet http://cytokinetics.com/20180930/taxonomy/role/DisclosureBalanceSheetComponentsSummaryOfAccruedLiabilitiesDetail Balance Sheet Components - Summary of Accrued Liabilities (Detail) Details 37 false false R38.htm 100370 - Disclosure - Long-Term Debt - Additional Information (Detail) Sheet http://cytokinetics.com/20180930/taxonomy/role/DisclosureLongTermDebtAdditionalInformationDetail Long-Term Debt - Additional Information (Detail) Details 38 false false R39.htm 100380 - Disclosure - Long-Term Debt - Schedule of Long Term Debt and Unamortized Debt Discount (Detail) Sheet http://cytokinetics.com/20180930/taxonomy/role/DisclosureLongTermDebtScheduleOfLongTermDebtAndUnamortizedDebtDiscountDetail Long-Term Debt - Schedule of Long Term Debt and Unamortized Debt Discount (Detail) Details 39 false false R40.htm 100400 - Disclosure - Long-Term Debt - Schedule of Future Minimum Payments under Loan Agreement (Detail) Sheet http://cytokinetics.com/20180930/taxonomy/role/DisclosureLongTermDebtScheduleOfFutureMinimumPaymentsUnderLoanAgreementDetail Long-Term Debt - Schedule of Future Minimum Payments under Loan Agreement (Detail) Details 40 false false R41.htm 100420 - Disclosure - Liability Related to Sale of Future Royalties - Additional Information (Detail) Sheet http://cytokinetics.com/20180930/taxonomy/role/DisclosureLiabilityRelatedToSaleOfFutureRoyaltiesAdditionalInformationDetail Liability Related to Sale of Future Royalties - Additional Information (Detail) Details 41 false false R42.htm 100430 - Disclosure - Stockholders' Equity - Additional Information (Detail) Sheet http://cytokinetics.com/20180930/taxonomy/role/DisclosureStockholdersEquityAdditionalInformationDetail Stockholders' Equity - Additional Information (Detail) Details 42 false false R43.htm 100440 - Disclosure - Commitments and Contingencies - Additional Information (Detail) Sheet http://cytokinetics.com/20180930/taxonomy/role/DisclosureCommitmentsAndContingenciesAdditionalInformationDetail Commitments and Contingencies - Additional Information (Detail) Details 43 false false All Reports Book All Reports cytk-20180930.xml cytk-20180930.xsd cytk-20180930_cal.xml cytk-20180930_def.xml cytk-20180930_lab.xml cytk-20180930_pre.xml http://fasb.org/srt/2018-01-31 http://xbrl.sec.gov/dei/2018-01-31 http://fasb.org/us-gaap/2018-01-31 http://xbrl.sec.gov/country/2017-01-31 true true