CYTK


Line plots across dimensions of each concept
Line plots across concepts
Tables

Table of contents



us-gaap:CommonStockValue
us-gaap:RelatedPartyTransactionsByRelatedParty, us-gaap:SubsequentEventType
us-gaap:CommonStockSharesIssued

us-gaap:WeightedAverageNumberOfShareOutstandingBasicAndDiluted

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecurities

us-gaap:EarningsPerShareBasicAndDiluted
us-gaap:AwardType, us-gaap:Vesting
us-gaap:AllocatedShareBasedCompensationExpense

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:GeneralAndAdministrativeExpense

us-gaap:InterestExpense
us-gaap:CreditFacility, us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:DebtInstrument
us-gaap:InterestExpenseDebt

us-gaap:NetIncomeLoss
us-gaap:StatementEquityComponents

us-gaap:NonoperatingIncomeExpense

us-gaap:OperatingExpenses

us-gaap:OperatingIncomeLoss

us-gaap:OtherComprehensiveIncomeLossNetOfTax
us-gaap:StatementEquityComponents

us-gaap:ProfitLoss

us-gaap:ResearchAndDevelopmentExpense

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
us-gaap:MajorCustomers, us-gaap:ProductOrService
us-gaap:MajorCustomers, us-gaap:ProductOrService, us-gaap:TypeOfArrangement
us-gaap:ProductOrService
us-gaap:TypeOfArrangement

us-gaap:Revenues

us-gaap:Assets

us-gaap:Liabilities

us-gaap:LiabilitiesAndStockholdersEquity

us-gaap:StockholdersEquity
us-gaap:StatementEquityComponents

us-gaap:AssetsCurrent

us-gaap:CashAndCashEquivalentsAtCarryingValue

us-gaap:AccountsReceivableNetCurrent
us-gaap:MajorCustomers, us-gaap:AdjustmentsForNewAccountingPronouncements
us-gaap:MajorCustomers, us-gaap:ProductOrService

us-gaap:PrepaidExpenseAndOtherAssetsCurrent

us-gaap:PropertyPlantAndEquipmentGross
us-gaap:PropertyPlantAndEquipmentByType
us-gaap:StatementGeographical, us-gaap:LeaseContractualTerm
us-gaap:ConstructionInProgressGross

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment

us-gaap:PropertyPlantAndEquipmentNet

us-gaap:OperatingLeaseRightOfUseAsset

us-gaap:OtherAssetsNoncurrent

us-gaap:EquitySecuritiesFvNi

us-gaap:AccountsPayableCurrent

us-gaap:AccruedLiabilitiesCurrent

us-gaap:LiabilitiesCurrent

us-gaap:LongTermDebtCurrent

us-gaap:OperatingLeaseLiabilityCurrent

us-gaap:OtherAccruedLiabilitiesCurrent

us-gaap:OtherLiabilitiesCurrent
us-gaap:DebtInstrument
us-gaap:LongTermDebt
us-gaap:DebtInstrument, us-gaap:LongtermDebtType

us-gaap:LongTermDebtNoncurrent

us-gaap:OperatingLeaseLiabilityNoncurrent

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive

us-gaap:OperatingLeaseLiability

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount

us-gaap:StockholdersEquity
us-gaap:StatementEquityComponents

us-gaap:CommonStockValue

us-gaap:AdditionalPaidInCapitalCommonStock

us-gaap:RetainedEarningsAccumulatedDeficit

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax
us-gaap:StatementEquityComponents, us-gaap:SubsidiarySaleOfStock
us-gaap:StockIssuedDuringPeriodValueNewIssues
us-gaap:SubsidiarySaleOfStock

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
us-gaap:StatementEquityComponents

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect

us-gaap:AmortizationOfFinancingCosts
us-gaap:DebtInstrument

us-gaap:DepreciationDepletionAndAmortization

us-gaap:IncreaseDecreaseInAccountsReceivable

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetIncomeLoss
us-gaap:StatementEquityComponents

us-gaap:ProfitLoss

us-gaap:ShareBasedCompensation

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice

us-gaap:UnrecognizedTaxBenefits

us-gaap:DeferredTaxAssetsValuationAllowance
us-gaap:StatementGeographical, us-gaap:LeaseContractualTerm
cytk:AdditionalLeaseAgreementAllowancesForTenantImprovements
us-gaap:StatementGeographical, us-gaap:LeaseContractualTerm
cytk:AdditionalTenantImprovementAllowancesInterestRatePercentage
us-gaap:MajorCustomers, us-gaap:TypeOfArrangement
cytk:AllocatedTransactionPriceOfCollaborativeArrangements
us-gaap:StatementGeographical, us-gaap:LeaseContractualTerm
cytk:BaseRentIncreaseDecreaseDuringInitialLeaseTerm
us-gaap:ChangeInAccountingEstimateByType
cytk:ChangeInEarningsPerShare
us-gaap:ChangeInAccountingEstimateByType
cytk:ChangeInNetIncomeLoss
us-gaap:DebtConversionByUniqueDescription, us-gaap:DebtInstrument
cytk:DebtInstrumentConvertibleThresholdLessThanPercentageOfStockPriceTrigger
us-gaap:TypeOfArrangement
cytk:ExcessAmountPaidOverFairValueOfShares
us-gaap:MajorCustomers, us-gaap:StatementEquityComponents, us-gaap:TypeOfArrangement
cytk:FairValueOfCommonStock
us-gaap:TypeOfArrangement
us-gaap:MajorCustomers, us-gaap:ProductOrService, us-gaap:TypeOfArrangement
cytk:FairValueOfRoyalty
us-gaap:TypeOfArrangement
us-gaap:CreditFacility, us-gaap:DebtInstrument, us-gaap:LongtermDebtType
cytk:FinalPaymentFeePercentage

cytk:IncreaseDecreaseInOperatingLeaseLiabilities

cytk:IncreaseDecreaseInOperatingLeaseRightOfUseAssets

cytk:IncreaseDecreaseInOperatingLeaseRightOfUseAssetsAndOtherAssets

cytk:IncreaseDecreaseInPrepaidAndOtherCurrentAssets

cytk:InterestAccretion

cytk:InterestReceivableAndAmortizationOnInvestments

cytk:NetShareSettlement
us-gaap:StatementEquityComponents

cytk:NonCashInterestExpenseOnLiabilityRelatedToSaleOfFutureRoyalties

cytk:NonCashInterestExpenseRelatedToDebt

cytk:NonCashInterestExpenseRelatedToSaleOfFutureRoyalties
us-gaap:ChangeInAccountingEstimateByType
us-gaap:ResearchAndDevelopmentArrangementContractToPerformForOthersByType

cytk:PaymentForPurchaseOfCappedCallOptionsAssociatedWithConvertibleNotes
us-gaap:ResearchAndDevelopmentArrangementContractToPerformForOthersByType
cytk:PaymentsForFutureRoyalties
us-gaap:ResearchAndDevelopmentArrangementContractToPerformForOthersByType, us-gaap:SubsequentEventType
us-gaap:StatementGeographical, us-gaap:StatementScenario, us-gaap:LeaseContractualTerm
cytk:PercentageOfLeaseSecurityDeposit
us-gaap:MajorCustomers, us-gaap:Range, us-gaap:ResearchAndDevelopmentArrangementContractToPerformForOthersByType
cytk:PotentialAmountsReceivableUnderCollaborationAgreement
us-gaap:CreditFacility, us-gaap:DebtInstrument, us-gaap:LongtermDebtType
cytk:PrepaymentFeePercentageAfterYearTwo
us-gaap:CreditFacility, us-gaap:DebtInstrument, us-gaap:LongtermDebtType
cytk:PrepaymentFeePercentageInFiscalYear
us-gaap:CreditFacility, us-gaap:DebtInstrument, us-gaap:LongtermDebtType
cytk:PrepaymentFeePercentageInYearTwo

cytk:ProceedsFromClaimsSettlements

cytk:ProceedsFromIssuanceOfUnderwrittenPublicOfferingOfCommonStockNet
us-gaap:TypeOfArrangement
cytk:StockIssueDuringPeriodPrivatePlacementShare

cytk:StockIssueDuringPeriodPrivatePlacementValue
us-gaap:StatementEquityComponents
us-gaap:DebtInstrument
us-gaap:AccretionAmortizationOfDiscountsAndPremiumsInvestments

us-gaap:AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation
us-gaap:StatementEquityComponents
us-gaap:CreditFacility, us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:AmortizationOfDebtDiscountPremium
us-gaap:DebtInstrument
us-gaap:TypeOfArrangement
us-gaap:AssetsFairValueAdjustment

us-gaap:CapitalExpendituresIncurredButNotYetPaid
us-gaap:DebtInstrument
us-gaap:DebtInstrumentConvertibleIfConvertedValueInExcessOfPrincipal
us-gaap:DebtConversionByUniqueDescription, us-gaap:DebtInstrument
us-gaap:DebtInstrumentConvertibleThresholdPercentageOfStockPriceTrigger

us-gaap:EquitySecuritiesFvNiUnrealizedGainLoss

us-gaap:IncreaseDecreaseInAccountsPayableTrade

us-gaap:IncreaseDecreaseInAccruedLiabilities

us-gaap:IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets

us-gaap:InvestmentIncomeInterest

us-gaap:OperatingLeaseExpense

us-gaap:OperatingLeasePayments

us-gaap:OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
us-gaap:StatementGeographical, us-gaap:LeaseContractualTerm
us-gaap:PaymentsForTenantImprovements

us-gaap:PaymentsToAcquireAvailableForSaleSecuritiesDebt
us-gaap:SubsequentEventType, us-gaap:TypeOfArrangement
us-gaap:ProceedsFromIssuanceOfCommonStock
us-gaap:TypeOfArrangement

us-gaap:ProceedsFromIssuanceOfPrivatePlacement

us-gaap:ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions

us-gaap:ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities

us-gaap:ProceedsFromSaleOfAvailableForSaleSecuritiesDebt

us-gaap:RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability
us-gaap:SubsequentEventType, us-gaap:SubsidiarySaleOfStock
us-gaap:SaleOfStockConsiderationReceivedOnTransaction
us-gaap:SubsidiarySaleOfStock
us-gaap:SubsequentEventType, us-gaap:SubsidiarySaleOfStock
us-gaap:SaleOfStockConsiderationReceivedPerTransaction
us-gaap:SubsidiarySaleOfStock
us-gaap:SubsidiarySaleOfStock
us-gaap:SaleOfStockNumberOfSharesIssuedInTransaction
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
us-gaap:AwardType, us-gaap:Vesting
us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
us-gaap:SubsequentEventType, us-gaap:SubsidiarySaleOfStock
us-gaap:StockIssuedDuringPeriodSharesNewIssues
us-gaap:SubsequentEventType, us-gaap:TypeOfArrangement
us-gaap:TypeOfArrangement
us-gaap:ClassOfWarrantOrRight, us-gaap:RelatedPartyTransactionsByRelatedParty, us-gaap:SubsequentEventType
us-gaap:StockIssuedDuringPeriodSharesStockOptionsExercised
us-gaap:DebtInstrument
us-gaap:StockIssuedDuringPeriodValueConversionOfUnits

us-gaap:StockIssuedDuringPeriodValueEmployeeStockPurchasePlan
us-gaap:StatementEquityComponents

us-gaap:StockIssuedDuringPeriodValueStockOptionsExercised
us-gaap:StatementEquityComponents
us-gaap:TypeOfArrangement
cytk:AccountReceivableAndDeferredRevenueUnrecognized

cytk:AccruedClinicalAndPreclinicalCostsCurrent
us-gaap:CreditFacility, us-gaap:DebtInstrument, us-gaap:LongtermDebtType
cytk:ClassOfWarrantOrRightOutstandingWeightedAverageExercisePrice

cytk:ConvertibleNotesNet
us-gaap:DebtInstrument

cytk:DeferredTaxAssetsCapitalizedResearchAndDevelopment

cytk:DeferredTaxAssetsLiabilityRelatedToSaleOfFutureRoyalties

cytk:DeferredTaxAssetsLongTermLeaseLiability

cytk:DeferredTaxLiabilitiesAccountingMethodChange
us-gaap:ChangeInAccountingEstimateByType
cytk:ImputedInterestRateOnUnamortizedLiability
us-gaap:ResearchAndDevelopmentArrangementContractToPerformForOthersByType
us-gaap:PlanName
cytk:IncreaseInNumberOfAuthorizedSharesReservedForIssuance

cytk:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFour

cytk:LiabilityRelatedToSaleOfFutureRoyaltiesNet
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
cytk:LongTermDebtMaturitiesRepaymentsInterestAndFinalPayment

cytk:LongTermLeaseAndOtherNonCurrentLiabilities

cytk:OperatingLeaseRightOfUseAssetsAndOtherAssets
us-gaap:StatementGeographical, us-gaap:LeaseContractualTerm
cytk:OperatingLeasesUndiscountedLeasePayments
cytk:Medical, us-gaap:ResearchAndDevelopmentArrangementContractToPerformForOthersByType
cytk:PercentOfRoyaltyOnSale
us-gaap:Range, us-gaap:TypeOfArrangement
cytk:PotentialMilestonePaymentsAndRoyaltiesReceivable
us-gaap:Range, us-gaap:SubsequentEventType, us-gaap:TypeOfArrangement
cytk:PotentialMilestonePaymentsReceivable
us-gaap:Range, us-gaap:TypeOfArrangement
us-gaap:StatementScenario, us-gaap:TypeOfArrangement
dei:LegalEntity, us-gaap:AdjustmentsForNewAccountingPronouncements
cytk:RevenueRecognitionPreCommercializationMilestoneReceivable
us-gaap:TypeOfArrangement
cytk:SaleOfInterestInFutureRoyalties
us-gaap:TypeOfArrangement
cytk:UpfrontPaymentReceived
us-gaap:CashAndCashEquivalents, us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
us-gaap:FairValueByAssetClass, us-gaap:FairValueByMeasurementFrequency
us-gaap:CashAndCashEquivalents, us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
us-gaap:FairValueByAssetClass, us-gaap:FairValueByMeasurementFrequency
us-gaap:CashAndCashEquivalents, us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis
us-gaap:FairValueByAssetClass, us-gaap:FairValueByMeasurementFrequency

us-gaap:AvailableForSaleSecuritiesDebtSecurities
us-gaap:BalanceSheetLocation
us-gaap:CashAndCashEquivalents, us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByAssetClass, us-gaap:FairValueByMeasurementFrequency
us-gaap:InvestmentType

us-gaap:AvailableForSaleSecuritiesDebtSecuritiesCurrent

us-gaap:AvailableForSaleSecuritiesNoncurrent

us-gaap:CashCashEquivalentsAndShortTermInvestments

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations
us-gaap:ClassOfWarrantOrRight, us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
us-gaap:ClassOfWarrantOrRight, us-gaap:RelatedPartyTransactionsByRelatedParty, us-gaap:SubsequentEventType
us-gaap:PlanName
us-gaap:CommonStockCapitalSharesReservedForFutureIssuance

us-gaap:ConvertibleDebtFairValueDisclosures
us-gaap:DebtInstrument
us-gaap:DebtInstrumentUnamortizedDiscount
us-gaap:DebtInstrument
us-gaap:DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet
us-gaap:TypeOfArrangement
us-gaap:DeferredFinanceCostsNet

us-gaap:DeferredIncomeTaxLiabilities

us-gaap:DeferredRevenueNoncurrent

us-gaap:DeferredTaxAssetsGross

us-gaap:DeferredTaxAssetsOperatingLossCarryforwards

us-gaap:DeferredTaxAssetsPropertyPlantAndEquipment

us-gaap:DeferredTaxAssetsTaxCreditCarryforwards

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals

us-gaap:DeferredTaxLiabilitiesFinancingArrangements

us-gaap:DeferredTaxLiabilitiesLeasingArrangements

us-gaap:EmployeeRelatedLiabilitiesCurrent
us-gaap:AwardType
us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions
us-gaap:DebtInstrument
us-gaap:InterestPayableCurrentAndNoncurrent

us-gaap:LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear

us-gaap:LongTermDebtFairValue
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo
us-gaap:DebtInstrument
us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear
us-gaap:DebtInstrument, us-gaap:LongtermDebtType

us-gaap:OperatingLeaseWeightedAverageDiscountRatePercent
us-gaap:LeaseContractualTerm
us-gaap:IncomeTaxAuthority
us-gaap:OperatingLossCarryforwards

us-gaap:PurchaseObligationFutureMinimumPaymentsRemainderOfFiscalYear
us-gaap:SubsequentEventType, us-gaap:SubsidiarySaleOfStock
us-gaap:SaleOfStockPricePerShare
us-gaap:SubsidiarySaleOfStock
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
us-gaap:PlanName
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
us-gaap:PlanName

us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1
us-gaap:TypeOfArrangement
us-gaap:SharesIssuedPricePerShare
us-gaap:DebtInstrument
us-gaap:UnamortizedDebtIssuanceExpense

us-gaap:UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate

Plots across concepts


IncomeStatement
Comprehensive Income Net Of Tax
Balance Sheet
Stockholders Equity
Assets
Property Plant And Equipment Net
Current Assets
Accounts Receivable Net Current
NonCurrent Assets
Other Assets Noncurrent
PropertyPlantAndEquipmentNet
Accumulated Depreciation Depletion And Amortization Property Plant And Equipment
Liabilities
Liabilities Current
Current Liabilities
Other Liabilities Current
Noncurrent Liabilities
Long Term Debt Noncurrent
Stockholders Equity
Retained Earnings Accumulated Deficit
CashFlow
Net Income Loss
NetCashProvidedByUsedInOperatingActivities
Net Income Loss
NetCashProvidedByUsedInInvestingActivities
Payments To Acquire Property Plant And Equipment
OperatingLeaseLiability
Operating Lease Liability Current
NonoperatingIncomeExpense
Nonoperating Income Expense
LesseeOperatingLeaseLiabilityPaymentsDue
Lessee Operating Lease Liability Payments Remainder Of Fiscal Year

Tables

  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:CommonStockValue ████▇▆▆▆▆▆▆▆▆▆▆▆▆▅▄▄▄▄▄▄▄▄▄▄▄▄▃▃▃▂▂▂▂▁▁▁▁0.0720.0710.070.070.060.0590.0590.0590.0580.0550.0550.0550.0550.0540.0540.0540.0530.0430.0410.0410.040.040.040.0390.0390.0390.0390.0370.0370.0360.0310.0290.0290.0245490.0238810.0237140.0222110.0130260.0125250.0120240.012024NA0.011189NANA
 us-gaap:CommonStockSharesIssued us-gaap:RelatedPartyTransactionsByRelatedParty,us-gaap:SubsequentEventType cytk:OTALLC,us-gaap:SubsequentEventNANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:WeightedAverageNumberOfShareOutstandingBasicAndDiluted █▁0.0717540.071195NA0.0682790.0596050.05927NA58.6457.64854.821NA54.62654.29354.062NA53.71948.21841.578NANA39.66639.592NA38.75238.72538.675NA36.60936.44332.985NA29.39525.773144.061NA134.16281.2376.082NA72.2871.151NANANANA
us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount NA27.43NANANA27.148NANANA6.952NANANA5.86NA6.626.95910.255NA1.99912.48712.377NA9.87210.21111.356NA10.08710.08811.035NA10.217NA89.47NA89.47299.32729.29NA28.29428.34NANANANA
 us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecurities cytk:EmployeeStockPurchasePlanNA0.045NANANA0.06NANANA0.085NANANA0.042NA0.0410.0180.059NA0.00.0240.04NA0.026NA0.036NANANANANANANANANANANANANANANANANANANA
 us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecurities cytk:RestrictedStockAndPerformanceUnitsNA1.154NANANA1.134NANANA0.881NANANA0.619NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecurities us-gaap:ConvertibleDebtSecuritiesNA16.675NANANA16.675NANANA0.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecurities us-gaap:EmployeeStockOptionNA9.508NANANA9.092NANANA5.844NANANA5.099NA6.026.175.905NA1.9995.9965.869NA3.513NA4.556NANANANANA2.452NANANANANANANANANANANANANA
 us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecurities us-gaap:WarrantNA0.048NANANA0.187NANANA0.142NANANA0.1NA0.10.313.83NA0.05.715.71NA5.5765.5766.691NA6.6916.6917.691NA7.692NA54.047NA54.05354.0536.685NA10.23810.238NANANANA
us-gaap:EarningsPerShareBasicAndDiluted ▁▃▃█▃▃▄▄▄▄▄▅▄▄▂▃▃▃-0.86-0.66-0.6299999999999999-0.05-0.68-0.66-0.5099999999999998-0.5-0.56-0.54-0.48-0.4-0.51-0.56-0.7699999999999998-0.6-0.6-0.62NANA-0.29-0.31-0.24-0.23-0.27-0.230.24000000000000005-0.16-0.23-0.270.28-0.43-0.58-0.09-0.07-0.07-0.13-0.13-0.16999999999999993-0.15-0.23-0.18-0.18000000000000005-0.19-0.21
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
 us-gaap:AllocatedShareBasedCompensationExpense us-gaap:AwardType,us-gaap:Vesting us-gaap:PerformanceShares,us-gaap:ShareBasedCompensationAwardTrancheOne0.7NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:ComprehensiveIncomeNetOfTax ▁▂▂▅▃▃▃▃▃▃▄▄▄▃▃▃▃▄▆█▅▅▅▅▅▅▆▅▅▅▆▅▄▅▅▅▅▅▅▅▅▅-61.626-47.203-44.739-3.554-41.056-38.471-30.68-29.615-31.958-29.26-26.415-22.014-27.562-30.135-40.568-31.845-29.159-26.0128.51731.91-11.538-12.448-9.095-8.847-10.533-8.8738.415-5.96-8.374-8.7386.519-12.569-15.051-12.627-11.451-10.03-8.942-9.933-11.883-10.646-13.626-11.699NANANA
us-gaap:GeneralAndAdministrativeExpense █▆▅▅▅▅▄▄▄▄▃▃▃▄▄▄▃▃▃▃▃▃▂▂▂▂▂▂▂▂▂▁▁▁▁▁▁▁▁▁▂▁▁▁▁21.19715.59813.90812.30214.16112.44910.5849.7539.8369.4377.5587.1648.0469.26410.2589.6578.4388.1156.6747.2177.096.8415.5295.2764.4954.3674.5583.9934.4584.2594.0933.6353.733.6343.8152.9912.5683.0562.8633.2044.1873.3363.573.4123.38
us-gaap:InterestExpense ██████▆▃▃▃▃▂▃▂▂▂▂▆▂▂▂▂▁▁4.0733.9884.0183.9763.8924.0772.7311.3451.3771.171.1690.8670.8980.8630.670.8060.7823.0520.7130.7140.7070.5630.2680.0NANANANANANANANANANANANANANANANANANANANANA
 us-gaap:InterestExpenseDebt us-gaap:DebtInstrument cytk:ConvertibleSeniorNotesDue2026█▅▆▄▁2.8392.7652.7812.7392.668NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:NetIncomeLoss ▁▂▂▅▃▃▃▃▃▃▄▄▄▃▃▃▃▄▆█▅▅▅▅▅▅▆▅▅▅▆▅▄▅▅▅▅▅▅▅▅▅▅▅▅-61.554-47.104-43.93-3.175-40.78-39.405-30.64-29.573-32.113-29.366-26.468-22.017-27.523-30.281-40.484-32.357-29.081-25.8677.15731.887-11.611-12.455-9.229-8.849-10.551-8.8728.443-5.971-8.374-8.7446.531-12.588-15.041-12.619-11.455-10.044-8.943-9.928-11.877-10.639-13.632-11.712-11.613-12.341-13.144
 us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents us-gaap:RetainedEarnings▁█-61.554-47.104NA-3.175-40.78-39.405NA-29.573-32.113-29.366-26.468-22.017-27.523-30.281NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:NonoperatingIncomeExpense ▃▃█▅▆▄▆▅▅▅▅▆▅▅▅▅▄▄▃▃▁▁▂▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃0.1870.292.1461.0781.3820.7231.331.021.0441.1410.91.3231.1260.8420.7740.7790.6120.4360.1820.111-0.6-0.501-0.2080.0390.0380.0370.0220.0270.0330.0260.0990.0230.0270.0280.0330.0290.0130.0120.020.0290.0150.040.0190.0480.01
us-gaap:OperatingExpenses █▆▆▅▅▄▃▄▄▄▄▃▄▄▅▄▃▃▃▃▂▂▂▂▂▁▁▁57.6447.15943.12936.50435.95134.18728.91829.98233.85332.98230.83528.55529.62831.39936.50934.60428.24727.40423.97526.55716.81320.37518.77816.83317.13113.32313.33715.413NANANANANANANANANANANANANANANANANA
us-gaap:OperatingIncomeLoss ▁▂▂▆▃▃▃▃▃▃▄▄▄▃▂▃▃▄▆█▅▄▅▅▅▅▆▅▅▅▆▄▄▄▄▅▅▅▄▅▄▄▄▄▄-54.797-40.611-36.4075.184-32.358-30.362-23.706-23.927-26.716-24.518-21.458-17.914-23.413-26.131-36.527-28.424-25.194-23.2519.16332.49-11.011-11.954-9.021-8.888-10.589-8.9098.421-5.998-8.407-8.776.432-12.611-15.068-12.647-11.489-10.073-8.956-9.94-11.898-10.668-13.647-11.752-11.632-12.565-13.154
us-gaap:OtherComprehensiveIncomeLossNetOfTax █▁-0.072-0.099NA-0.379-0.2760.934NA-0.0420.1550.1060.053-0.003-0.0390.146NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:OtherComprehensiveIncomeLossNetOfTax us-gaap:StatementEquityComponents us-gaap:AccumulatedOtherComprehensiveIncome█▁-0.072-0.099NA-0.379-0.2760.934NA-0.0420.1550.1060.053-0.003-0.0390.146NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:ProfitLoss ▁▃▃█▃▄▅▅▅▅▅▆▅▅▄▅-61.554-47.104-43.93-3.175-40.78-39.405-30.64-29.573-32.113-29.366-26.468-22.017-27.523-30.281-40.485-32.357NANANANANANANANANANANANA-8.374-8.744NANA-15.041-12.619-11.456-10.044-8.942-9.928-11.878-10.638-13.632-11.712-11.613-12.341NA
us-gaap:ResearchAndDevelopmentExpense █▇▆▅▄▄▄▄▅▅▅▄▄▄▅▅▄▄▃▄▁▂▂▂▂▁▁▂▂▂▂▂▂▁▁▁▁▁▁▁▂▁▁▁▁36.44331.56129.22124.20221.7921.73818.33420.22924.01723.54523.27721.39121.58222.13526.25124.94719.80919.28917.30119.349.72313.53413.24911.55712.6368.9568.77911.4211.73712.4913.82413.44512.3479.8349.8588.7988.2428.7458.68.89110.5139.1799.1619.54710.236
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax ▁▂▂▆▁▁▂▂▂▂▂▂▂▂▁▂▁▁▅█▂▂▂▂▂▂▄▂▂▂▄▂▁▁▁▁▁▁▁▁▁▁▁▁▁2.8436.5486.72241.6883.5933.8255.2126.0557.1378.4649.37710.6416.2155.268-0.0186.183.0534.15333.13859.0475.8028.4219.7577.9456.5424.41421.7589.4157.7887.97924.3494.4691.0090.8212.1841.7141.8411.820.7571.4271.0530.7631.0990.3940.462
us-gaap:Revenues ▁▂▂▆▁▁▂▂▂▂▂▂▂▂▁▂▁▁▅█▂▂▂▂▂▂▄▂▂▂▄▂▁▁▁▁▁▁▁▁▁▁▁▁▁2.8436.5486.72241.6883.5933.8255.2126.0557.1378.4649.37710.6416.2155.268-0.0186.183.0534.15333.13859.0475.8028.4219.7577.9456.5424.41421.7589.4157.7887.97924.3494.4691.0090.8212.1841.7141.8411.820.7571.4271.0530.7631.0990.3940.462
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:Assets ██▇▇▃▄▄▃▃▃▃▃▄▄▄▅▅▄▃▂▂▂▂▂▂▂▂▂▂▂▁▂▂▁▁▂▂▁▁▁▁564.302577.062533.803474.112232.495256.582289.814187.393198.218198.611211.178230.279247.239279.926294.81326.313340.63265.374170.142158.17106.161113.218115.237102.196112.706122.214132.96887.18596.143107.27783.18888.00694.55564.6977.55185.34594.08146.53152.77361.77872.157NA77.992NANA
us-gaap:Liabilities ██▆▅▅▅▅▄▄▃▃▃▃▃▃▃▃▃▂▂▂▂▂▁▁▁▁▁▁▁▁▂▁▁▁▁▁▁▁▁▁547.813509.216420.42324.507310.575302.293300.751207.262203.114195.239185.244178.21172.069180.327184.968179.275165.629169.99175.78174.9257.41555.31246.64734.89637.84538.06240.90413.55517.44621.09928.74648.25542.5666.267.4664.7424.14.5244.5955.0345.505NA7.476NANA
us-gaap:LiabilitiesAndStockholdersEquity ██▇▇▃▄▄▃▃▃▃▃▄▄▄▅▅▄▃▂▂▂▂▂▂▂▂▂▂▂▁▂▂▁▁▂▂▁▁▁▁564.302577.062533.803474.112232.495256.582289.814187.393198.218198.611211.178230.279247.239279.926294.81326.313340.63265.374170.142158.17106.161113.218115.237102.196112.706122.214132.96887.18596.143107.27783.18888.00694.55564.6977.55185.34594.08146.53152.77361.77872.157NA77.992NANA
us-gaap:StockholdersEquity ▄▅▆▇▁▂▃▃▃▃▄▅▅▆▆▇█▆▆▅▅▅▅▅▅▅▆▅▅▆▅▄▅▅▅▅▆▄▄▅▅16.48967.846113.383149.605-78.08-45.711-10.937-19.869-4.8963.37225.93452.06975.1799.599109.842147.038175.00195.38394.36183.2548.74657.90668.5967.374.86184.15292.06473.6378.69786.17854.44239.75151.98958.4370.08580.60389.98142.00748.17856.74466.652NA70.516NANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:AssetsCurrent ▆▇█▇▄▄▄▃▃▃▄▄▄▅▅▆▅▄▃▃▂▂▂▂▂▂▂▂▂▂▂▂▂▁▂▂▂▁▁▁▁364.229433.117474.221418.412218.954225.938233.752176.535184.951186.4207.674227.269244.229272.339274.295321.987316.996211.023158.633148.18496.618106.118113.107100.515107.9110.81131.13181.49180.07886.05479.33883.32193.6263.66576.42778.76992.9645.22151.1459.87169.804NA73.498NANA
us-gaap:CashAndCashEquivalentsAtCarryingValue ▂▂▄█▃▂▂▂▂▂▂▂▂▅▅▅▄▂▃▂▂▂▃▂▁▁▁▁▁▁▁▁▁▁▁▁▃▁▁▁▁▁▁▂▁37.15444.59482.985200.81261.13449.77636.43339.63434.36139.40942.25627.62446.955115.011125.206116.32100.71149.36466.87430.327.72442.26965.07625.96224.83922.54620.21512.90712.35513.25620.15819.25817.05713.1614.90715.3963.65417.81518.83318.59123.76915.45217.51430.43918.365
us-gaap:AccountsReceivableNetCurrent ▃▄▄▄▃▃▅▆▇▄▃▇▁▁▂█2.7014.5144.424.9652.2542.7045.1636.5768.9934.1652.2319.1560.2360.0371.11210.0NANA0.024NANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:PrepaidExpenseAndOtherAssetsCurrent █▂▄▂▃▂▃▃▂▂▂▁▁▂▃▃▄▃▂▂▅▂▁▂▂▂▁11.2273.0265.7413.1833.6372.5283.4773.922.5153.1412.1581.9271.6772.2984.2924.424.9453.5572.362.5756.2542.6961.6532.4832.7131.9721.257NANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:PropertyPlantAndEquipmentGross NANA37.987NANANA28.725NANANA27.065NANANA26.194NANANA24.755NANANA22.593NANANA21.964NANANA22.213NANANA24.285NANANA24.102NANANANANANA
 us-gaap:PropertyPlantAndEquipmentGross us-gaap:PropertyPlantAndEquipmentByType cytk:ComputerEquipmentAndSoftwareNANA2.94NANANA2.94NANANA2.882NANANA2.89NANANA2.699NANANA2.51NANANA2.418NANANA2.549NANANA3.19NANANA3.105NANANANANANA
 us-gaap:PropertyPlantAndEquipmentGross us-gaap:PropertyPlantAndEquipmentByType cytk:LaboratoryEquipmentNANA18.16NANANA18.741NANANA17.916NANANA17.1NANANA16.742NANANA15.713NANANA15.299NANANA15.317NANANA17.064NANANA17.016NANANANANANA
 us-gaap:PropertyPlantAndEquipmentGross us-gaap:PropertyPlantAndEquipmentByType cytk:OfficeEquipmentFurnitureAndFixturesNANA1.885NANANA1.823NANANA1.137NANANA1.137NANANA0.856NANANA0.945NANANA0.913NANANA1.05NANANA0.638NANANA0.623NANANANANANA
 us-gaap:PropertyPlantAndEquipmentGross us-gaap:PropertyPlantAndEquipmentByType us-gaap:ConstructionInProgressNANA9.13NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:PropertyPlantAndEquipmentGross us-gaap:PropertyPlantAndEquipmentByType us-gaap:LeaseholdImprovementsNANA5.872NANANA5.221NANANA5.13NANANA5.067NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:ConstructionInProgressGross us-gaap:StatementGeographical,us-gaap:LeaseContractualTerm country:CA,cytk:OfficeAndLaboratoryNANA9.1NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:ConstructionInProgressGross us-gaap:StatementGeographical,us-gaap:LeaseContractualTerm stpr:CA,cytk:OfficeAndLaboratory█▁32.418.7NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment NANA24.641NANANA24.195NANANA23.861NANANA22.626NANANA21.118NANANA20.842NANANA20.327NANANA20.992NANANA23.288NANANA22.792NANANANANANA
us-gaap:PropertyPlantAndEquipmentNet █▅▃▂▂▂▂▂▁▁▁▁▁▁▂▁▁▂▂▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁36.94223.19813.3467.6675.6115.1624.533.6152.9453.1753.2042.6872.5983.1563.5683.2943.2683.4883.6372.0491.6591.761.7511.4811.5711.5511.6371.4911.5131.5081.2210.8040.8090.8980.9970.9060.9941.1321.311.5141.705NA2.321NANA
us-gaap:OperatingLeaseRightOfUseAsset ██▁83.00679.6872.924NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OtherAssetsNoncurrent █▄▁6.4536.3966.358NANANANA7.2438.0689.0360.30.3230.4120.4160.4290.4490.2790.2410.20.20.20.20.20.20.20.20.20.20.20.20.1270.1270.1260.1270.1270.1270.1270.1270.1270.1780.209NA0.179NANA
us-gaap:EquitySecuritiesFvNi NANANA1.91.30.61.01.01.01.00.7NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:AccountsPayableCurrent █▅▅▄▂▂▅▂▃▂▃▂▁▂▃▃▂▂▃▁▂▁▂▂▂▁▁▂▁▂▃▂▂▁▂▁▁▁▁▁▁14.9287.7668.056.7382.923.5278.163.4125.1942.5473.7642.0241.3362.4245.2534.0791.7833.0424.2360.6682.8460.5472.2381.9071.6011.3921.3611.6460.9851.6893.7091.7891.8011.0862.0021.5181.0460.9261.1961.451.005NA1.119NANA
us-gaap:AccruedLiabilitiesCurrent █▅▇▅▅▃▄▅▄▅▆▆▆▆▆▇▅▆▆▆▃▃▃▂▂▁▂▂▂▃▃▃▂▂▂▁▁▁▁▁▁22.39414.80619.31514.48613.6889.67712.12313.13911.82812.94415.75715.65216.0915.54517.39218.45513.54517.50318.04717.7839.5037.8778.4216.7596.4293.9815.46.0126.9117.6788.2729.8866.7064.694.8772.9422.9433.5413.2323.2633.737NA5.372NANA
us-gaap:LiabilitiesCurrent █▅▄▄▃▃▄▃▃▄▃▃▄▅▄▆▄▅▅▄▄▄▄▄▄▄▃▂▃▃▄▆▅▁▁▁▁▁▁▁▁61.76635.9331.19927.57322.69620.74126.02321.51721.95926.27722.19421.49227.28938.54632.44442.35731.05936.79633.25829.33426.27224.68331.64930.14329.11225.38523.85512.98616.91719.79226.70445.01134.0465.8197.1054.5893.9894.4674.5925.0345.505NA7.324NANA
us-gaap:LongTermDebtCurrent █▁11.255.625NANANANA0.00.00.06.2122.6073.7781.7030.00.09.8297.3154.8252.5NANANA0.0NANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OperatingLeaseLiabilityCurrent █▄▃▃▄▄▄▄▄▄▁12.195.2952.7853.9435.0755.034.6164.5774.5384.4990.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OtherAccruedLiabilitiesCurrent █▆▄▄█▆▄▃▂▄▂▄▃▅▄▁▁▆▄▁2.6942.2431.4041.4372.5572.0021.5651.1440.891.5881.0211.4791.2731.8561.4260.7230.7021.9711.5950.615NANA0.791NANANA0.317NANANA0.115NANANA0.257NANANA0.295NANANANANANA
us-gaap:OtherLiabilitiesCurrent ▄█▄█▄█▄▂▂▁▁▁▁▂▂▂▂1.0042.4381.0492.4061.0132.5071.1240.3890.3990.0750.0660.0380.0280.2350.2270.4240.474NA0.415NANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
 us-gaap:LongTermDebt us-gaap:DebtInstrument cytk:ConvertibleSeniorNotesDue2026▁█168.36171.12NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LongTermDebt us-gaap:DebtInstrument,us-gaap:LongtermDebtType cytk:OxfordAndSiliconValleyBank,cytk:TermLoanAgreement▁▅██55.25156.17757.08257.08NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LongTermDebtNoncurrent ▆▇███████▆▇▆▅▅▅▂▃▃▄▄▄▄▁35.53840.87446.20945.9245.63145.3445.05244.76244.47336.38239.80638.12730.66231.95431.77720.47122.84425.19527.38129.74229.60429.46614.639NANANA0.0NANANANANANANANANANANANANANANANANANA
us-gaap:OperatingLeaseLiabilityNoncurrent NA85.6330.44NA0.5911.7742.1953.2574.2945.2720.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo █▂▁▁16.09813.30812.69412.694NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree ██▁▁17.21617.21616.19416.195NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour ██▁▁17.66817.66816.64816.648NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive ██▁18.24918.24917.231NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive ██▁163.434163.434153.689NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:StockholdersEquity ▄▅▆▇▁▂▃▃▃▃▄▅▅▆▆▇█▆▆▅▅▅▅▅▅▅▆▅▅▆▅▄▅▅▅▅▆▄▄▅▅16.48967.846113.383149.605-78.08-45.711-10.937-19.869-4.8963.37225.93452.06975.1799.599109.842147.038175.00195.38394.36183.2548.74657.90668.5967.374.86184.15292.06473.6378.69786.17854.44239.75151.98958.4370.08580.60389.98142.00748.17856.74466.652NA70.516NANA
us-gaap:CommonStockValue ████▇▆▆▆▆▆▆▆▆▆▆▆▆▅▄▄▄▄▄▄▄▄▄▄▄▄▃▃▃▂▂▂▂▁▁▁▁0.0720.0710.070.070.060.0590.0590.0590.0580.0550.0550.0550.0550.0540.0540.0540.0530.0430.0410.0410.040.040.040.0390.0390.0390.0390.0370.0370.0360.0310.0290.0290.0245490.0238810.0237140.0222110.0130260.0125250.0120240.012024NA0.011189NANA
us-gaap:AdditionalPaidInCapitalCommonStock ████▅▅▄▄▄▃▃▃▃▃▃▃▃▂▁▁▁▁▁▁▁1117.4031107.1351105.471096.953865.724857.038853.341813.729799.088775.401768.703765.97762.887757.405755.526752.154748.273639.507612.474609.88607.287604.909603.145592.76591.476NA589.272NANANANANANANANANANANANANANANANANANA
us-gaap:RetainedEarningsAccumulatedDeficit ▁▂▂▂▃▃▃▄▄▄▅▅▅▅▅▆▆▆▇▇▆▆▇▇▇▇▇▇▇▇▇▇▇▇▇▇█████-1101.0-1039.4-992.306-948.376-945.201-904.421-865.016-834.376-804.803-772.69-743.324-714.403-688.222-658.349-646.081-605.596-573.239-544.158-518.291-526.923-558.81-547.199-534.744-525.515-516.666-506.115-497.243-505.686-499.715-491.34-482.597-489.128-476.54-461.499-448.88-437.424-427.38-418.438-408.51-396.632-385.994NA-360.65NANA
us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax ▁▂▂▅▇█▄▄▄▄▃▃▃▃▃▃▁▁▂▂▂▂▂▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁-0.0220.050.1490.9581.3371.6130.6790.7190.7610.6060.50.4470.450.4890.3430.426-0.086-0.0090.1370.2520.2290.1560.1490.0160.012-0.006-0.0040.0240.0120.0120.0070.019-0.0010.010.0180.013-0.001-0.0020.0030.0080.015NA-0.004NANA
 us-gaap:StockIssuedDuringPeriodValueNewIssues us-gaap:StatementEquityComponents,us-gaap:SubsidiarySaleOfStock us-gaap:AdditionalPaidInCapital,cytk:UnderwriterNANANA188.875NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:StockIssuedDuringPeriodValueNewIssues us-gaap:StatementEquityComponents,us-gaap:SubsidiarySaleOfStock us-gaap:CommonStock,cytk:UnderwriterNANANA0.008NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:StockIssuedDuringPeriodValueNewIssues us-gaap:SubsidiarySaleOfStock cytk:UnderwriterNANANA188.883NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue █▁7.0935.261NA4.6924.5273.524NA2.7832.8192.2822.2812.5722.5052.403NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:NetCashProvidedByUsedInOperatingActivities ▁▁█▅▁▁▂▂▂▁▃▁▁▁▂▂-29.496-29.51952.1514.367-27.439-30.135-19.055-20.268-24.677-26.907-12.327-32.235-26.846-29.807-24.071-25.483NANANANANANANANANANANANA-9.376-17.822-12.42910.3096.624-12.222-7.124-8.878-8.699-8.737-10.945-9.264-12.506-12.88-9.091-10.317NA
us-gaap:NetCashProvidedByUsedInInvestingActivities ▇▆▁▃██▃▇▇▇▇▇▅▇██18.881-5.276-173.618-101.02334.63743.489-105.26613.682-2.76719.64426.5082.677-44.18820.13630.76339.658NANANANANANANANANANANANA8.44-28.865.813-7.592-10.2110.476.616-38.974-1.5095.0528.7934.2651.17211.071-8.64822.763NA
us-gaap:NetCashProvidedByUsedInFinancingActivities ▁▁▁█▁▁▅▁▂▁▁▁▁▁▁▁3.175-3.5963.641226.3344.16-0.011121.1211.85922.3964.4160.45110.2272.978-0.5242.1941.434NANANANANANANANANANANANA0.03539.787.516-0.5167.4830.0050.025-0.41256.0472.6672.394-0.17919.651-0.2534.814-0.372NA
us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect ▄▃▁█▅▅▄▄▄▄▅▄▂▄▄▅-7.44-38.391-117.827139.67811.35813.343-3.2015.273-5.048-2.84714.632-19.331-68.056-10.1958.88615.609NANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:AmortizationOfFinancingCosts █▁0.0290.027NA0.020.0190.018NA0.0170.0160.016NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:DepreciationDepletionAndAmortization ▇▇▇▇▆▆▆▆▅▅▁▅██0.5430.5370.4710.5360.4160.4080.3910.3360.280.286-0.320.2680.6180.673NANA0.4390.4210.2240.1770.170.170.1510.1460.1470.1450.1370.1260.1220.1050.0880.1010.120.1240.1290.140.1440.1780.2290.2550.390.4230.4630.471NA
us-gaap:IncreaseDecreaseInAccountsReceivable ▄▅▄▅▄▄▄▄▅▅▄▅▅▄▄▅▄▅▁█-1.8130.094-0.5452.711-0.45-2.459-1.413-2.4174.8281.934-6.9258.920.199-1.075-8.88810.0-0.9090.885-66.97666.974NANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:NetCashProvidedByUsedInOperatingActivities ▁▁█▅▁▁▂▂▂▁▃▁▁▁▂▂-29.496-29.51952.1514.367-27.439-30.135-19.055-20.268-24.677-26.907-12.327-32.235-26.846-29.807-24.071-25.483NANANANANANANANANANANANA-9.376-17.822-12.42910.3096.624-12.222-7.124-8.878-8.699-8.737-10.945-9.264-12.506-12.88-9.091-10.317NA
us-gaap:NetIncomeLoss ▁▂▂▅▃▃▃▃▃▃▄▄▄▃▃▃▃▄▆█▅▅▅▅▅▅▆▅▅▅▆▅▄▅▅▅▅▅▅▅▅▅▅▅▅-61.554-47.104-43.93-3.175-40.78-39.405-30.64-29.573-32.113-29.366-26.468-22.017-27.523-30.281-40.484-32.357-29.081-25.8677.15731.887-11.611-12.455-9.229-8.849-10.551-8.8728.443-5.971-8.374-8.7446.531-12.588-15.041-12.619-11.455-10.044-8.943-9.928-11.877-10.639-13.632-11.712-11.613-12.341-13.144
 us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents us-gaap:RetainedEarnings▁█-61.554-47.104NA-3.175-40.78-39.405NA-29.573-32.113-29.366-26.468-22.017-27.523-30.281NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:ProfitLoss ▁▃▃█▃▄▅▅▅▅▅▆▅▅▄▅-61.554-47.104-43.93-3.175-40.78-39.405-30.64-29.573-32.113-29.366-26.468-22.017-27.523-30.281-40.485-32.357NANANANANANANANANANANANA-8.374-8.744NANA-15.041-12.619-11.456-10.044-8.942-9.928-11.878-10.638-13.632-11.712-11.613-12.341NA
us-gaap:ShareBasedCompensation █▅▅▅▄▃▂▂▂▁7.0935.2614.8774.6924.5273.5242.8752.7832.8192.282NANANANA2.442.4472.2191.9221.881.8661.7891.6111.3481.1211.2020.8960.8860.8910.8590.6940.6560.8451.130.9660.9071.0640.8690.9430.8410.7360.7310.7610.8521.159NA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:NetCashProvidedByUsedInInvestingActivities ▇▆▁▃██▃▇▇▇▇▇▅▇██18.881-5.276-173.618-101.02334.63743.489-105.26613.682-2.76719.64426.5082.677-44.18820.13630.76339.658NANANANANANANANANANANANA8.44-28.865.813-7.592-10.2110.476.616-38.974-1.5095.0528.7934.2651.17211.071-8.64822.763NA
us-gaap:PaymentsToAcquirePropertyPlantAndEquipment █▆▆▃▂▂▂▂▁▁▁▁▁▁▂▁▁▂▂▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁8.7926.6266.5552.5920.8641.0411.3061.0060.050.2570.210.3580.060.2610.780.4510.2581.3880.8540.3060.0160.420.2040.0530.1750.130.2470.10.4240.3330.2520.0690.0440.1770.0590.0460.0070.0130.0250.1010.1420.1750.0870.132NA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:NetCashProvidedByUsedInFinancingActivities ▁▁▁█▁▁▅▁▂▁▁▁▁▁▁▁3.175-3.5963.641226.3344.16-0.011121.1211.85922.3964.4160.45110.2272.978-0.5242.1941.434NANANANANANANANANANANANA0.03539.787.516-0.5167.4830.0050.025-0.41256.0472.6672.394-0.17919.651-0.2534.814-0.372NA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30

Common Stock Value

us-gaap:CommonStockValue

us-gaap:CommonStockValue


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value72000.071000.070000.070000.060000.059000.059000.059000.058000.055000.055000.055000.055000.054000.054000.054000.053000.043000.041000.041000.040000.040000.040000.039000.039000.039000.039000.037000.037000.036000.031000.029000.029000.024549.023881.023714.022211.013026.012525.012024.012024.011189.0
Percentage of CommonStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Common Stock Shares Issued

us-gaap:CommonStockSharesIssued us-gaap:RelatedPartyTransactionsByRelatedParty, us-gaap:SubsequentEventType

us-gaap:CommonStockSharesIssued

cytk:OTALLC, us-gaap:SubsequentEvent


Common
Period End2020-07-21
Value0.095932
Percentage of CommonStockSharesIssued100.0

Weighted Average Number Of Share Outstanding Basic And Diluted

us-gaap:WeightedAverageNumberOfShareOutstandingBasicAndDiluted

us-gaap:WeightedAverageNumberOfShareOutstandingBasicAndDiluted


Weighted
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-30
Value0.0717540.0711950.0682790.0596050.059275857545454545348413939383838363632292514413481767271
Percentage of WeightedAverageNumberOfShareOutstandingBasicAndDiluted100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount


Antidilutive
Period End2021-03-312020-03-312019-03-312018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-30
Value27276.9525.866.626.959101.99912129.872101110101110898999292828
Percentage of AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecurities

cytk:EmployeeStockPurchasePlan


Antidilutive
Period End2021-03-312020-03-312019-03-312018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-03-31
Value0.0450.060.0850.0420.0410.0180.0590.00.0240.040.0260.036
Percentage of AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount0.20.21.20.70.60.30.60.00.20.30.30.3

cytk:RestrictedStockAndPerformanceUnits


Antidilutive
Period End2021-03-312020-03-312019-03-312018-03-31
Value1.1541.1340.8810.619
Percentage of AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount4.24.212.710.6

us-gaap:ConvertibleDebtSecurities


Antidilutive
Period End2021-03-312020-03-312019-03-31
Value16160.0
Percentage of AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount60.861.40.0

us-gaap:EmployeeStockOption


Antidilutive
Period End2021-03-312020-03-312019-03-312018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-03-312013-09-30
Value9.5089.0925.8445.0996.026.175.9051.9995.9965.8693.5134.5562.452
Percentage of AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount34.733.584.187.090.988.757.6100.048.047.435.640.124.0

us-gaap:Warrant


Antidilutive
Period End2021-03-312020-03-312019-03-312018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-30
Value0.0480.1870.1420.10.10.313.830.05.715.715.5765.5766.6916.6916.6917.6917.6925454546.6851010
Percentage of AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount0.20.72.01.71.54.537.30.045.746.156.554.658.966.366.369.775.360.460.454.422.836.236.1

Earnings Per Share Basic And Diluted

us-gaap:EarningsPerShareBasicAndDiluted

us-gaap:EarningsPerShareBasicAndDiluted


Earnings
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value-0.86-0.66-0.63-0.05-0.68-0.66-0.51-0.5-0.56-0.54-0.48-0.4-0.51-0.56-0.77-0.6-0.6-0.62-0.29-0.31-0.24-0.23-0.27-0.230.24-0.16-0.23-0.270.28-0.43-0.58-0.09-0.07-0.07-0.13-0.13-0.17-0.15-0.23-0.18-0.18-0.19-0.21
Percentage of EarningsPerShareBasicAndDiluted100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Allocated Share Based Compensation Expense

us-gaap:AllocatedShareBasedCompensationExpense us-gaap:AwardType, us-gaap:Vesting

us-gaap:AllocatedShareBasedCompensationExpense

us-gaap:PerformanceShares, us-gaap:ShareBasedCompensationAwardTrancheOne


Allocated
Period End2021-06-30
Value0.7
Percentage of AllocatedShareBasedCompensationExpense100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax24.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:PerformanceShares us-gaap:ShareBasedCompensationAwardTrancheOne0.0

Comprehensive Income Net Of Tax

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:ComprehensiveIncomeNetOfTax


Comprehensive
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value-61.626-47.203-44.739-3.554-41.056-38.471-30.68-29.615-31.958-29.26-26.415-22.014-27.562-30.135-40.568-31.845-29.159-26.0128.51731-11.538-12.448-9.095-8.847-10.533-8.8738.415-5.96-8.374-8.7386.519-12.569-15.051-12.627-11.451-10.03-8.942-9.933-11.883-10.646-13.626-11.699
Percentage of ComprehensiveIncomeNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-2167.6-720.90.0-8.5-1142.7-1005.80.0-489.1-447.8-345.70.0-206.9-443.5-572.0225377.8-515.3-955.1-626.325.754.0-198.9-147.8-93.2-111.4-161.0-201.038.7-63.3-107.5-109.526.8-281.2-1491.7-1538.0-524.3-585.2-485.7-545.8-1569.7-746.0-1294.0-1533.3

General And Administrative Expense

us-gaap:GeneralAndAdministrativeExpense

us-gaap:GeneralAndAdministrativeExpense


General
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value211513121412109.7539.8369.4377.5587.1648.0469.264109.6578.4388.1156.6747.2177.096.8415.5295.2764.4954.3674.5583.9934.4584.2594.0933.6353.733.6343.8152.9912.5683.0562.8633.2044.1873.3363.573.4123.38
Percentage of GeneralAndAdministrativeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax745.6238.20.029.5394.1325.50.0161.1137.8111.50.067.3129.5175.9-56988.9156.3276.4195.420.112.2122.281.256.766.468.798.920.942.457.253.416.881.3369.7442.6174.7174.5139.5167.9378.2224.5397.6437.20.0866.0731.6

Interest Expense

us-gaap:InterestExpense

us-gaap:InterestExpense


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-30
Value4.0733.9884.0183.9763.8924.0772.7311.3451.3771.171.1690.8670.8980.8630.670.8060.7823.0520.7130.7140.7070.5630.2680.0
Percentage of InterestExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax143.360.90.09.5108.3106.60.022.219.313.80.08.114.416.4-3722.213.025.673.52.21.212.26.72.70.0

us-gaap:InterestExpense us-gaap:CreditFacility, us-gaap:DebtInstrument, us-gaap:LongtermDebtType

cytk:TwoThousandNineteenTermLoan, cytk:OxfordAndSiliconValleyBank, cytk:TermLoanAgreement


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value1.21.21.21.21.21.21.31.31.41.2
Percentage of InterestExpense29.530.129.930.230.829.447.696.7101.7102.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax42.218.30.02.933.431.40.021.519.614.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cytk:TwoThousandNineteenTermLoan cytk:OxfordAndSiliconValleyBank cytk:TermLoanAgreement0.00.00.00.00.00.00.00.00.00.0

Interest Expense Debt

us-gaap:InterestExpenseDebt us-gaap:DebtInstrument

us-gaap:InterestExpenseDebt

cytk:ConvertibleSeniorNotesDue2026


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-30
Value2.8392.7652.7812.7392.668
Percentage of InterestExpenseDebt100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax99.942.20.06.674.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cytk:ConvertibleSeniorNotesDue20260.00.00.00.00.0

Net Income Loss

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLoss


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value-61.554-47.104-43.93-3.175-40.78-39.405-30.64-29.573-32.113-29.366-26.468-22.017-27.523-30.281-40.484-32.357-29.081-25.8677.15731-11.611-12.455-9.229-8.849-10.551-8.8728.443-5.971-8.374-8.7446.531-12.588-15.041-12.619-11.455-10.044-8.943-9.928-11.877-10.639-13.632-11.712-11.613-12.341-13.144
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-2165.1-719.40.0-7.6-1135.0-1030.20.0-488.4-450.0-347.00.0-206.9-442.8-574.8224911.1-523.6-952.5-622.921.654.0-200.1-147.9-94.6-111.4-161.3-201.038.8-63.4-107.5-109.626.8-281.7-1490.7-1537.0-524.5-586.0-485.8-545.5-1569.0-745.6-1294.6-1535.00.0-3132.2-2845.0

us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Net
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-61.554-47.104-3.175-40.78-39.405-29.573-32.113-29.366-26.468-22.017-27.523-30.281
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-2165.1-719.4-7.6-1135.0-1030.2-488.4-450.0-347.00.0-206.9-442.8-574.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.0

Nonoperating Income Expense

us-gaap:NonoperatingIncomeExpense

us-gaap:NonoperatingIncomeExpense


Nonoperating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value0.1870.292.1461.0781.3820.7231.331.021.0441.1410.91.3231.1260.8420.7740.7790.6120.4360.1820.111-0.6-0.501-0.2080.0390.0380.0370.0220.0270.0330.0260.0990.0230.0270.0280.0330.0290.0130.0120.020.0290.0150.040.0190.0480.01
Percentage of NonoperatingIncomeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax6.64.40.02.638.518.90.016.814.613.50.012.418.116.0-4300.012.620.010.50.50.2-10.3-5.9-2.10.50.60.80.10.30.40.30.40.52.73.41.51.70.70.72.62.01.45.20.012.22.2

Operating Expenses

us-gaap:OperatingExpenses

us-gaap:OperatingExpenses


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value57474336353428293332302829313634282723261620181617131315
Percentage of OperatingExpenses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2027.4720.20.087.61000.6893.80.0495.2474.3389.70.0268.3476.7596.0-202827.8559.9925.2659.972.345.0289.8242.0192.5211.9261.9301.861.3163.7

Operating Income Loss

us-gaap:OperatingIncomeLoss

us-gaap:OperatingIncomeLoss


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value-54.797-40.611-36.4075.184-32.358-30.362-23.706-23.927-26.716-24.518-21.458-17.914-23.413-26.131-36.527-28.424-25.194-23.2519.16332-11.011-11.954-9.021-8.888-10.589-8.9098.421-5.998-8.407-8.776.432-12.611-15.068-12.647-11.489-10.073-8.956-9.94-11.898-10.668-13.647-11.752-11.632-12.565-13.154
Percentage of OperatingIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-1927.4-620.20.012.4-900.6-793.80.0-395.2-374.3-289.70.0-168.3-376.7-496.0202927.8-459.9-825.2-559.927.755.0-189.8-142.0-92.5-111.9-161.9-201.838.7-63.7-107.9-109.926.4-282.2-1493.4-1540.4-526.1-587.7-486.5-546.2-1571.7-747.6-1296.0-1540.20.0-3189.1-2847.2

Other Comprehensive Income Loss Net Of Tax

us-gaap:OtherComprehensiveIncomeLossNetOfTax

us-gaap:OtherComprehensiveIncomeLossNetOfTax


Other
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-72000.0-99000.0-379000.0-276000.0934000.0-42000.0155000.0106000.053000.0-3000.0-39000.0146000.0
Percentage of OtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-2.5-1.5-0.9-7.724.4-0.72.21.30.0-0.0-0.62.8

us-gaap:OtherComprehensiveIncomeLossNetOfTax us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome


Other
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-72000.0-99000.0-379000.0-276000.0934000.0-42000.0155000.0106000.053000.0-3000.0-39000.0146000.0
Percentage of OtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-2.5-1.5-0.9-7.724.4-0.72.21.30.0-0.0-0.62.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.0

Profit Loss

us-gaap:ProfitLoss

us-gaap:ProfitLoss


Profit
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302014-06-302014-03-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value-61.554-47.104-43.93-3.175-40.78-39.405-30.64-29.573-32.113-29.366-26.468-22.017-27.523-30.281-40.485-32.357-8.374-8.744-15.041-12.619-11.456-10.044-8.942-9.928-11.878-10.638-13.632-11.712-11.613-12.341
Percentage of ProfitLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-2165.1-719.40.0-7.6-1135.0-1030.20.0-488.4-450.0-347.00.0-206.9-442.8-574.8224916.7-523.6-107.5-109.6-1490.7-1537.0-524.5-586.0-485.7-545.5-1569.1-745.5-1294.6-1535.00.0-3132.2

Research And Development Expense

us-gaap:ResearchAndDevelopmentExpense

us-gaap:ResearchAndDevelopmentExpense


Research
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value36312924212118202423232121222624191917199.723131311128.9568.7791111121313129.8349.8588.7988.2428.7458.68.891109.1799.1619.54710
Percentage of ResearchAndDevelopmentExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1281.9482.00.058.1606.5568.30.0334.1336.5278.20.0201.0347.3420.2-145838.9403.7648.8464.552.232.8167.6160.7135.8145.5193.2202.940.3121.3150.7156.556.8300.91223.71197.8451.4513.3447.7480.51136.1623.1998.41203.00.02423.12215.6

Revenue From Contract With Customer Excluding Assessed Tax

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value2.8436.5486.722413.5933.8255.2126.0557.1378.4649.377106.2155.268-0.0186.183.0534.15333595.8028.4219.7577.9456.5424.414219.4157.7887.979244.4691.0090.8212.1841.7141.8411.820.7571.4271.0530.7631.0990.3940.462
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:MajorCustomers, us-gaap:ProductOrService

cytk:Amgen, cytk:ResearchAndDevelopmentMilestoneGrantAndOtherRevenuesNet


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value2.54.81.6999999999999993.82.12.33.33.52.84.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax87.973.325.39.158.460.163.357.839.249.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax87.973.325.39.158.460.163.357.839.249.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cytk:Amgen cytk:ResearchAndDevelopmentMilestoneGrantAndOtherRevenuesNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cytk:Astellas, cytk:ResearchAndDevelopment


Revenue
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value0.31.71.41.21.52.54.44.38.54.73.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax10.626.03.433.439.241.361.750.879.975.668.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax10.626.03.433.439.241.361.750.879.975.668.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cytk:Astellas cytk:ResearchAndDevelopment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:MajorCustomers, us-gaap:ProductOrService, us-gaap:TypeOfArrangement

cytk:RTWInvestmentsLP, cytk:LicenseAndCollaboration, us-gaap:CollaborativeArrangement


Revenue
Period End2020-12-312020-07-14
Value0.036
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cytk:RTWInvestmentsLP cytk:LicenseAndCollaboration us-gaap:CollaborativeArrangement0.0100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductOrService

cytk:ResearchAndDevelopment


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value2.8436.5483.9225.1873.5933.8255.2126.0557.1378.4649.3778.7264.683.585
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.058.312.4100.0100.0100.0100.0100.0100.0100.082.075.368.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.058.312.4100.0100.0100.0100.0100.0100.0100.082.075.368.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cytk:ResearchAndDevelopment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:License


Revenue
Period End2020-12-312020-09-302019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value0.0360.00.00.00.00.01.9151.5351.6832.0930.3184.942
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.087.60.00.00.00.00.018.024.731.9-11627.85.1161.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.087.60.00.00.00.00.018.024.731.9-11627.85.1161.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:License0.0100.00.00.00.00.00.0100.0100.0100.0100.0100.0100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:TypeOfArrangement

cytk:LicenseAndCollaborationAgreement


Revenue
Period End2020-09-30
Value36
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax87.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax87.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cytk:LicenseAndCollaborationAgreement100.0

Revenues

us-gaap:Revenues

us-gaap:Revenues


Revenues
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value2.8436.5486.722413.5933.8255.2126.0557.1378.4649.377106.2155.268-0.0186.183.0534.15333595.8028.4219.7577.9456.5424.414219.4157.7887.979244.4691.0090.8212.1841.7141.8411.820.7571.4271.0530.7631.0990.3940.462
Percentage of Revenues100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Assets

us-gaap:Assets

us-gaap:Assets


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value5645775334742322562891871981982112302472792943263402651701581061131151021121221328796107838894647785944652617277
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Liabilities

us-gaap:Liabilities

us-gaap:Liabilities


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value5475094203243103023002072031951851781721801841791651697574575546343738401317212848426.267.4664.7424.14.5244.5955.0345.5057.476
Percentage of Liabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets97.188.278.868.4133.6117.8103.8110.6102.598.387.777.469.664.462.754.948.664.144.547.454.148.940.534.133.631.130.815.518.119.734.654.845.09.79.65.64.49.78.78.17.69.6

Liabilities And Stockholders Equity

us-gaap:LiabilitiesAndStockholdersEquity

us-gaap:LiabilitiesAndStockholdersEquity


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value5645775334742322562891871981982112302472792943263402651701581061131151021121221328796107838894647785944652617277
Percentage of LiabilitiesAndStockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Stockholders Equity

us-gaap:StockholdersEquity

us-gaap:StockholdersEquity


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-312009-12-312008-12-312007-12-312006-12-312005-12-312004-12-312003-12-312002-12-312001-12-312000-12-311999-12-311998-12-31
Value1667113149-78.08-45.711-10.937-19.869-4.8963.3722552759910914717595948348576867748492737886543951587080894248566670101499910673107-92.031-60.588-37.352-21.818-9.121-2.005
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.911.821.231.6-33.6-17.8-3.8-10.6-2.51.712.322.630.435.637.345.151.435.955.552.645.951.159.565.966.468.969.284.581.980.365.445.255.090.390.494.495.690.391.391.992.490.40.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:StockholdersEquity us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-312007-12-312006-12-312005-12-312004-12-312003-12-312002-12-312001-12-312000-12-311999-12-311998-12-31
Value-0.0220.050.1490.9581.3371.6130.6790.7190.7610.6060.50.4470.450.4890.3430.1370.149-0.0040.0070.0180.003-0.0040.0010.018-0.001-0.075-0.014-0.1880.0460.040.2680.078-0.0080.0
Percentage of StockholdersEquity-0.10.10.10.6-1.7-3.5-6.2-3.6-15.518.01.90.90.60.50.30.10.2-0.00.00.00.0-0.00.00.0-0.0-0.1-0.0-0.2-0.0-0.1-0.7-0.40.1-0.0
Percentage of Assets-0.00.00.00.20.60.60.20.40.40.30.20.20.20.20.10.10.1-0.00.00.00.0-0.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdditionalPaidInCapital


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-312007-12-312006-12-312005-12-312004-12-312003-12-312002-12-312001-12-312000-12-311999-12-311998-12-31
Value11171107110510968658578538137997757687657627577556126035895375184564314123853793382492435.6460.8090.7450.6430.3560.009
Percentage of StockholdersEquity6776.71631.8975.0733.2-1108.8-1874.9-7802.3-4095.5-16321.222995.32964.11471.11014.9760.5687.8649.1879.3640.1986.4740.2947.8611.4406.9774.8380.0318.0339.2226.2-6.1-1.3-2.0-2.9-3.9-0.4
Percentage of Assets198.0191.9207.1231.4372.4334.0294.4434.2403.1390.4364.0332.6308.6270.6256.3360.0523.4443.2645.5669.0865.2552.80.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonStock


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-312007-12-312006-12-312005-12-312004-12-312003-12-312002-12-312001-12-312000-12-311999-12-311998-12-31
Value0.0720.0710.070.070.060.0590.0590.0590.0580.0550.0550.0550.0550.0540.0540.0410.040.0390.0310.1430.0750.0670.0610.050.0490.0430.030.0280.0020.0020.0020.0020.0010.001
Percentage of StockholdersEquity0.40.10.10.0-0.1-0.1-0.5-0.3-1.21.60.20.10.10.10.00.00.10.00.10.20.20.10.10.10.00.00.00.0-0.0-0.0-0.0-0.0-0.0-0.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.20.10.10.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:CommonStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-312007-12-312006-12-312005-12-312004-12-312003-12-312002-12-312001-12-312000-12-311999-12-311998-12-31
Value-1100.964-1039.41-992.306-948.376-945.201-904.421-865.016-834.376-804.803-772.69-743.324-714.403-688.222-658.349-646.081-518.291-534.744-497.243-482.597-448.88-408.51-360.65-311.363-335.907-279.533-230.639-173.524-131.272-94.074-61.389-38.309-22.435-9.356-2.015
Percentage of StockholdersEquity-6677.0-1532.0-875.2-633.91210.61978.67909.14199.416438.0-22914.9-2866.2-1372.0-915.6-661.0-588.2-549.3-779.6-540.1-886.4-640.5-847.9-511.4-307.0-675.0-279.8-216.9-235.9-122.0102.2101.3102.6102.8102.6100.5
Percentage of Assets-195.1-180.1-185.9-200.0-406.5-352.5-298.5-445.3-406.0-389.0-352.0-310.2-278.4-235.2-219.2-304.6-464.0-374.0-580.1-578.8-774.1-462.40.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Assets Current

us-gaap:AssetsCurrent

us-gaap:AssetsCurrent


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value36443347441821822523317618418620722724427227432131621115814896106113100107110131818086798393637678924551596973
Percentage of AssetsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets64.575.188.888.394.288.180.794.293.393.998.398.798.897.393.098.793.179.593.293.791.093.798.298.495.790.798.693.583.380.295.494.799.098.498.692.398.897.296.996.996.794.2

Cash And Cash Equivalents At Carrying Value

us-gaap:CashAndCashEquivalentsAtCarryingValue

us-gaap:CashAndCashEquivalentsAtCarryingValue


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-312008-12-31
Value374482200614936393439422746115125116100496630274265252422201212132019171314156317181823151730182541
Percentage of CashAndCashEquivalentsAtCarryingValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets6.67.715.542.426.319.412.621.217.319.820.012.019.041.142.535.629.618.639.319.226.137.356.525.422.018.415.214.812.912.424.221.918.020.319.218.067.738.335.730.132.90.022.50.00.00.00.0

Accounts Receivable Net Current

us-gaap:AccountsReceivableNetCurrent

us-gaap:AccountsReceivableNetCurrent


Accounts
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-12-31
Value2701000.04514000.04420000.04965000.02254000.02704000.05163000.06576000.08993000.04165000.02231000.09156000.0236000.037000.01112000.010000000.024000.0
Percentage of AccountsReceivableNetCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.50.80.81.01.01.11.83.54.52.11.14.00.10.00.43.10.0

us-gaap:AccountsReceivableNetCurrent us-gaap:MajorCustomers, us-gaap:AdjustmentsForNewAccountingPronouncements

cytk:Astellas, us-gaap:AccountingStandardsUpdate201409


Accounts
Period End2021-06-302021-03-312020-12-312020-09-302020-03-312019-12-312018-12-312018-09-302017-12-31
Value200000.0300000.02700000.01100000.001900000.0300000.09200.00
Percentage of AccountsReceivableNetCurrent7.46.661.122.20.036.813.40.10.0
Percentage of Assets0.00.10.50.20.00.70.10.00.0
Percentage of Assets cytk:Astellas us-gaap:AccountingStandardsUpdate2014090.00.00.00.00.00.00.00.00.0

us-gaap:AccountsReceivableNetCurrent us-gaap:MajorCustomers, us-gaap:ProductOrService

cytk:Amgen, cytk:ResearchAndDevelopment


Accounts
Period End2020-12-312019-12-312018-12-31
Value1700000.03300000.01900000.0
Percentage of AccountsReceivableNetCurrent38.563.985.2
Percentage of Assets0.31.10.9
Percentage of Assets cytk:Amgen cytk:ResearchAndDevelopment0.00.00.0

cytk:Amgen, cytk:ResearchAndDevelopmentMilestoneGrantAndOtherRevenuesNet


Accounts
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value2500000.04200000.01700000.03800000.02100000.02300000.03300000.0
Percentage of AccountsReceivableNetCurrent92.693.038.576.593.285.163.9
Percentage of Assets0.40.70.30.80.90.91.1
Percentage of Assets cytk:Amgen cytk:ResearchAndDevelopmentMilestoneGrantAndOtherRevenuesNet0.00.00.00.00.00.00.0

Prepaid Expense And Other Assets Current

us-gaap:PrepaidExpenseAndOtherAssetsCurrent

us-gaap:PrepaidExpenseAndOtherAssetsCurrent


Prepaid
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value113.0265.7413.1833.6372.5283.4773.922.5153.1412.1581.9271.6772.2984.2924.424.9453.5572.362.5756.2542.6961.6532.4832.7131.9721.257
Percentage of PrepaidExpenseAndOtherAssetsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.00.51.10.71.61.01.22.11.31.61.00.80.70.81.51.41.51.31.41.65.92.41.42.42.41.60.9

Property Plant And Equipment Gross

us-gaap:PropertyPlantAndEquipmentGross

us-gaap:PropertyPlantAndEquipmentGross


Property
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value37282726242221222424
Percentage of PropertyPlantAndEquipmentGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets7.19.912.88.914.519.616.526.731.345.7

us-gaap:PropertyPlantAndEquipmentGross us-gaap:PropertyPlantAndEquipmentByType

cytk:ComputerEquipmentAndSoftware


Property
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value2.942.942.8822.892.6992.512.4182.5493.193.105
Percentage of PropertyPlantAndEquipmentGross7.710.210.611.010.911.111.011.513.112.9
Percentage of Assets0.61.01.41.01.62.21.83.14.15.9
Percentage of Assets cytk:ComputerEquipmentAndSoftware0.00.00.00.00.00.00.00.00.00.0

cytk:LaboratoryEquipment


Property
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value18181717161515151717
Percentage of PropertyPlantAndEquipmentGross47.865.266.265.367.669.569.769.070.370.6
Percentage of Assets3.46.58.55.89.813.611.518.422.032.2
Percentage of Assets cytk:LaboratoryEquipment0.00.00.00.00.00.00.00.00.00.0

cytk:OfficeEquipmentFurnitureAndFixtures


Property
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value1.8851.8231.1371.1370.8560.9450.9131.050.6380.623
Percentage of PropertyPlantAndEquipmentGross5.06.34.24.33.54.24.24.72.62.6
Percentage of Assets0.40.60.50.40.50.80.71.30.81.2
Percentage of Assets cytk:OfficeEquipmentFurnitureAndFixtures0.00.00.00.00.00.00.00.00.00.0

us-gaap:ConstructionInProgress


Property
Period End2020-12-31
Value9.13
Percentage of PropertyPlantAndEquipmentGross24.0
Percentage of Assets1.7
Percentage of Assets us-gaap:ConstructionInProgress0.0

us-gaap:LeaseholdImprovements


Property
Period End2020-12-312019-12-312018-12-312017-12-31
Value5.8725.2215.135.067
Percentage of PropertyPlantAndEquipmentGross15.518.219.019.3
Percentage of Assets1.11.82.41.7
Percentage of Assets us-gaap:LeaseholdImprovements0.00.00.00.0

Construction In Progress Gross

us-gaap:ConstructionInProgressGross us-gaap:StatementGeographical, us-gaap:LeaseContractualTerm

us-gaap:ConstructionInProgressGross

country:CA, cytk:OfficeAndLaboratory


Construction
Period End2020-12-31
Value9.1
Percentage of ConstructionInProgressGross100.0
Percentage of Assets1.7
Percentage of Assets country:CA cytk:OfficeAndLaboratory0.0

stpr:CA, cytk:OfficeAndLaboratory


Construction
Period End2021-06-302021-03-31
Value3218
Percentage of ConstructionInProgressGross0.00.0
Percentage of Assets5.73.2
Percentage of Assets stpr:CA cytk:OfficeAndLaboratory0.00.0

Accumulated Depreciation Depletion And Amortization Property Plant And Equipment

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment


Accumulated
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value24242322212020202322
Percentage of AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets4.68.311.37.712.418.115.325.230.043.2

Property Plant And Equipment Net

us-gaap:PropertyPlantAndEquipmentNet

us-gaap:PropertyPlantAndEquipmentNet


Property
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value3623137.6675.6115.1624.533.6152.9453.1753.2042.6872.5983.1563.5683.2943.2683.4883.6372.0491.6591.761.7511.4811.5711.5511.6371.4911.5131.5081.2210.8040.8090.8980.9970.9060.9941.1321.311.5141.7052.321
Percentage of PropertyPlantAndEquipmentNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets6.54.02.51.62.42.01.61.91.51.61.51.21.11.11.21.01.01.32.11.31.61.61.51.41.41.31.21.71.61.41.50.90.91.41.31.11.12.42.52.52.43.0

Operating Lease Right Of Use Asset

us-gaap:OperatingLeaseRightOfUseAsset

us-gaap:OperatingLeaseRightOfUseAsset


Operating
Period End2021-06-302021-03-312020-12-312019-01-01
Value83792.9249.6
Percentage of OperatingLeaseRightOfUseAsset100.0100.0100.0100.0
Percentage of Assets14.713.80.50.0

Other Assets Noncurrent

us-gaap:OtherAssetsNoncurrent

us-gaap:OtherAssetsNoncurrent


Other
Period End2021-06-302021-03-312020-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value6453000.06396000.06358000.07243000.08068000.09036000.0300000.0323000.0412000.0416000.0429000.0449000.0279000.0241000.0200000.0200000.0200000.0200000.0200000.0200000.0200000.0200000.0200000.0200000.0200000.0200000.0127000.0127000.0126000.0127000.0127000.0127000.0127000.0127000.0127000.0178000.0209000.0179000.0
Percentage of OtherAssetsNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.11.11.23.94.14.50.10.10.20.10.10.10.10.10.10.10.20.20.20.20.20.20.20.20.20.20.20.10.10.20.20.10.10.30.20.30.30.2

Equity Securities Fv Ni

us-gaap:EquitySecuritiesFvNi

us-gaap:EquitySecuritiesFvNi


Equity
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value1900000.01300000.0600000.01000000.01000000.01000000.01000000.0700000.0
Percentage of EquitySecuritiesFvNi100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.40.60.20.30.50.50.50.3

Accounts Payable Current

us-gaap:AccountsPayableCurrent

us-gaap:AccountsPayableCurrent


Accounts
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value147.7668.056.7382.923.5278.163.4125.1942.5473.7642.0241.3362.4245.2534.0791.7833.0424.2360.6682.8460.5472.2381.9071.6011.3921.3611.6460.9851.6893.7091.7891.8011.0862.0021.5181.0460.9261.1961.451.0051.119
Percentage of AccountsPayableCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.61.31.51.41.31.42.81.82.61.31.80.90.50.91.81.30.51.12.50.42.70.51.91.91.41.11.01.91.01.64.52.01.91.72.61.81.12.02.32.31.41.4

Accrued Liabilities Current

us-gaap:AccruedLiabilitiesCurrent

us-gaap:AccruedLiabilitiesCurrent


Accrued
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value22141914139.67712131112151516151718131718179.5037.8778.4216.7596.4293.9815.46.0126.9117.6788.2729.8866.7064.694.8772.9422.9433.5413.2323.2633.7375.372
Percentage of AccruedLiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets4.02.63.63.15.93.84.27.06.06.57.56.86.55.65.95.74.06.610.611.29.07.07.36.65.73.34.16.97.27.29.911.27.17.26.33.43.17.66.15.35.26.9

Liabilities Current

us-gaap:LiabilitiesCurrent

us-gaap:LiabilitiesCurrent


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value6135312722202621212622212738324231363329262431302925231216192645345.8197.1054.5893.9894.4674.5925.0345.5057.324
Percentage of LiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets10.96.25.85.89.88.19.011.511.113.210.59.311.013.811.013.09.113.919.518.524.721.827.529.525.820.817.914.917.618.432.151.136.09.09.25.44.29.68.78.17.69.4

Long Term Debt Current

us-gaap:LongTermDebtCurrent

us-gaap:LongTermDebtCurrent


Long
Period End2021-06-302021-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value115.6250.00.00.06.2122.6073.7781.7030.00.09.8297.3154.8252.50.0
Percentage of LongTermDebtCurrent100.0100.00.00.00.0100.0100.0100.0100.00.00.0100.0100.0100.0100.00.0
Percentage of Assets2.01.00.00.00.03.11.21.60.70.00.03.02.11.81.50.0

Operating Lease Liability Current

us-gaap:OperatingLeaseLiabilityCurrent

us-gaap:OperatingLeaseLiabilityCurrent


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value125.2952.7853.9435.0755.034.6164.5774.5384.4990.0
Percentage of OperatingLeaseLiabilityCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0
Percentage of Assets2.20.90.50.82.22.01.62.42.32.30.0

Other Accrued Liabilities Current

us-gaap:OtherAccruedLiabilitiesCurrent

us-gaap:OtherAccruedLiabilitiesCurrent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302015-12-312014-12-312013-12-312012-12-312011-12-31
Value2694000.02243000.01404000.01437000.02557000.02002000.01565000.01144000.0890000.01588000.01021000.01479000.01273000.01856000.01426000.0723000.0702000.01971000.01595000.0615000.0791000.0317000.0115000.0257000.0295000.0
Percentage of OtherAccruedLiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.50.40.30.31.10.80.50.60.40.80.50.60.50.70.50.20.20.70.90.40.70.20.10.30.6

Other Liabilities Current

us-gaap:OtherLiabilitiesCurrent

us-gaap:OtherLiabilitiesCurrent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-31
Value1004000.02438000.01049000.02406000.01013000.02507000.01124000.0389000.0399000.075000.066000.038000.028000.0235000.0227000.0424000.0474000.0415000.0
Percentage of OtherLiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.20.40.20.50.41.00.40.20.20.00.00.00.00.10.10.10.10.2

Long Term Debt

us-gaap:LongTermDebt us-gaap:DebtInstrument

us-gaap:LongTermDebt

cytk:ConvertibleSeniorNotesDue2026


Long
Period End2021-06-302021-03-31
Value168171
Percentage of LongTermDebt100.0100.0
Percentage of Assets29.829.7
Percentage of Assets cytk:ConvertibleSeniorNotesDue20260.00.0

us-gaap:LongTermDebt us-gaap:DebtInstrument, us-gaap:LongtermDebtType

cytk:OxfordAndSiliconValleyBank, cytk:TermLoanAgreement


Long
Period End2021-06-302021-03-312020-12-312020-09-30
Value55565757
Percentage of LongTermDebt32.832.80.00.0
Percentage of Assets9.89.710.712.0
Percentage of Assets cytk:OxfordAndSiliconValleyBank cytk:TermLoanAgreement0.00.00.00.0

Long Term Debt Noncurrent

us-gaap:LongTermDebtNoncurrent

us-gaap:LongTermDebtNoncurrent


Long
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-31
Value35404645454545444436393830313120222527292929140.0
Percentage of LongTermDebtNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0
Percentage of Assets6.37.18.79.719.617.715.523.922.418.318.816.612.411.410.86.36.79.516.118.827.926.012.70.0

Operating Lease Liability Noncurrent

us-gaap:OperatingLeaseLiabilityNoncurrent

us-gaap:OperatingLeaseLiabilityNoncurrent


Operating
Period End2021-03-312020-12-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value850.440.5911.7742.1953.2574.2945.2720.0
Percentage of OperatingLeaseLiabilityNoncurrent100.0100.0100.0100.0100.0100.0100.0100.00.0
Percentage of Assets14.80.10.30.70.81.72.22.70.0

Lessee Operating Lease Liability Payments Due Year Two

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo


Lessee
Period End2021-06-302021-03-312020-12-312020-09-30
Value16131212
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearTwo100.0100.0100.0100.0
Percentage of Assets2.92.32.42.7

Lessee Operating Lease Liability Payments Due Year Three

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree


Lessee
Period End2021-06-302021-03-312020-12-312020-09-30
Value17171616
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearThree100.0100.0100.0100.0
Percentage of Assets3.13.03.03.4

Lessee Operating Lease Liability Payments Due Year Four

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour


Lessee
Period End2021-06-302021-03-312020-12-312020-09-30
Value17171616
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFour100.0100.0100.0100.0
Percentage of Assets3.13.13.13.5

Lessee Operating Lease Liability Payments Due Year Five

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive


Lessee
Period End2021-06-302021-03-312020-12-31
Value181817
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFive100.0100.0100.0
Percentage of Assets3.23.23.2

Lessee Operating Lease Liability Payments Due After Year Five

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive


Lessee
Period End2021-06-302021-03-312020-12-31
Value163163153
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive100.0100.0100.0
Percentage of Assets29.028.328.8

Operating Lease Liability

us-gaap:OperatingLeaseLiability

us-gaap:OperatingLeaseLiability


Operating
Period End2021-06-302021-03-312020-12-312020-09-302019-01-01
Value107903.2254.4610
Percentage of OperatingLeaseLiability100.0100.0100.0100.0100.0
Percentage of Assets19.115.80.60.90.0

Lessee Operating Lease Liability Payments Due

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue


Lessee
Period End2021-06-302021-03-312020-12-312020-09-30
Value236232221222
Percentage of LesseeOperatingLeaseLiabilityPaymentsDue100.0100.0100.0100.0
Percentage of Assets42.040.341.446.9

Lessee Operating Lease Liability Undiscounted Excess Amount

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount


Lessee
Period End2021-06-302021-03-312020-12-312020-09-30
Value1281410.180.277
Percentage of LesseeOperatingLeaseLiabilityUndiscountedExcessAmount100.0100.0100.0100.0
Percentage of Assets22.824.50.00.1

Stockholders Equity

us-gaap:StockholdersEquity

us-gaap:StockholdersEquity


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-312009-12-312008-12-312007-12-312006-12-312005-12-312004-12-312003-12-312002-12-312001-12-312000-12-311999-12-311998-12-31
Value1667113149-78.08-45.711-10.937-19.869-4.8963.3722552759910914717595948348576867748492737886543951587080894248566670101499910673107-92.031-60.588-37.352-21.818-9.121-2.005
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.911.821.231.6-33.6-17.8-3.8-10.6-2.51.712.322.630.435.637.345.151.435.955.552.645.951.159.565.966.468.969.284.581.980.365.445.255.090.390.494.495.690.391.391.992.490.40.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:StockholdersEquity us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-312007-12-312006-12-312005-12-312004-12-312003-12-312002-12-312001-12-312000-12-311999-12-311998-12-31
Value-0.0220.050.1490.9581.3371.6130.6790.7190.7610.6060.50.4470.450.4890.3430.1370.149-0.0040.0070.0180.003-0.0040.0010.018-0.001-0.075-0.014-0.1880.0460.040.2680.078-0.0080.0
Percentage of StockholdersEquity-0.10.10.10.6-1.7-3.5-6.2-3.6-15.518.01.90.90.60.50.30.10.2-0.00.00.00.0-0.00.00.0-0.0-0.1-0.0-0.2-0.0-0.1-0.7-0.40.1-0.0
Percentage of Assets-0.00.00.00.20.60.60.20.40.40.30.20.20.20.20.10.10.1-0.00.00.00.0-0.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdditionalPaidInCapital


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-312007-12-312006-12-312005-12-312004-12-312003-12-312002-12-312001-12-312000-12-311999-12-311998-12-31
Value11171107110510968658578538137997757687657627577556126035895375184564314123853793382492435.6460.8090.7450.6430.3560.009
Percentage of StockholdersEquity6776.71631.8975.0733.2-1108.8-1874.9-7802.3-4095.5-16321.222995.32964.11471.11014.9760.5687.8649.1879.3640.1986.4740.2947.8611.4406.9774.8380.0318.0339.2226.2-6.1-1.3-2.0-2.9-3.9-0.4
Percentage of Assets198.0191.9207.1231.4372.4334.0294.4434.2403.1390.4364.0332.6308.6270.6256.3360.0523.4443.2645.5669.0865.2552.80.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonStock


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-312007-12-312006-12-312005-12-312004-12-312003-12-312002-12-312001-12-312000-12-311999-12-311998-12-31
Value0.0720.0710.070.070.060.0590.0590.0590.0580.0550.0550.0550.0550.0540.0540.0410.040.0390.0310.1430.0750.0670.0610.050.0490.0430.030.0280.0020.0020.0020.0020.0010.001
Percentage of StockholdersEquity0.40.10.10.0-0.1-0.1-0.5-0.3-1.21.60.20.10.10.10.00.00.10.00.10.20.20.10.10.10.00.00.00.0-0.0-0.0-0.0-0.0-0.0-0.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.20.10.10.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:CommonStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-312007-12-312006-12-312005-12-312004-12-312003-12-312002-12-312001-12-312000-12-311999-12-311998-12-31
Value-1100.964-1039.41-992.306-948.376-945.201-904.421-865.016-834.376-804.803-772.69-743.324-714.403-688.222-658.349-646.081-518.291-534.744-497.243-482.597-448.88-408.51-360.65-311.363-335.907-279.533-230.639-173.524-131.272-94.074-61.389-38.309-22.435-9.356-2.015
Percentage of StockholdersEquity-6677.0-1532.0-875.2-633.91210.61978.67909.14199.416438.0-22914.9-2866.2-1372.0-915.6-661.0-588.2-549.3-779.6-540.1-886.4-640.5-847.9-511.4-307.0-675.0-279.8-216.9-235.9-122.0102.2101.3102.6102.8102.6100.5
Percentage of Assets-195.1-180.1-185.9-200.0-406.5-352.5-298.5-445.3-406.0-389.0-352.0-310.2-278.4-235.2-219.2-304.6-464.0-374.0-580.1-578.8-774.1-462.40.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Common Stock Value

us-gaap:CommonStockValue

us-gaap:CommonStockValue


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value72000.071000.070000.070000.060000.059000.059000.059000.058000.055000.055000.055000.055000.054000.054000.054000.053000.043000.041000.041000.040000.040000.040000.039000.039000.039000.039000.037000.037000.036000.031000.029000.029000.024549.023881.023714.022211.013026.012525.012024.012024.011189.0
Percentage of CommonStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Additional Paid In Capital Common Stock

us-gaap:AdditionalPaidInCapitalCommonStock

us-gaap:AdditionalPaidInCapitalCommonStock


Additional
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-31
Value1117110711051096865857853813799775768765762757755752748639612609607604603592591589
Percentage of AdditionalPaidInCapitalCommonStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets198.0191.9207.1231.4372.4334.0294.4434.2403.1390.4364.0332.6308.6270.6256.3230.5219.7241.0360.0385.6572.0534.3523.4580.0524.8443.2

Retained Earnings Accumulated Deficit

us-gaap:RetainedEarningsAccumulatedDeficit

us-gaap:RetainedEarningsAccumulatedDeficit


Retained
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value-1101.0-1039.4-992.306-948.376-945.201-904.421-865.016-834.376-804.803-772.69-743.324-714.403-688.222-658.349-646.081-605.596-573.239-544.158-518.291-526.923-558.81-547.199-534.744-525.515-516.666-506.115-497.243-505.686-499.715-491.34-482.597-489.128-476.54-461.499-448.88-437.424-427.38-418.438-408.51-396.632-385.994-360.65
Percentage of RetainedEarningsAccumulatedDeficit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets-195.1-180.1-185.9-200.0-406.5-352.5-298.5-445.3-406.0-389.0-352.0-310.2-278.4-235.2-219.2-185.6-168.3-205.1-304.6-333.1-526.4-483.3-464.0-514.2-458.4-414.1-374.0-580.0-519.8-458.0-580.1-555.8-504.0-713.4-578.8-512.5-454.3-899.3-774.1-642.0-534.9-462.4

Accumulated Other Comprehensive Income Loss Net Of Tax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax


Accumulated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value-22000.050000.0149000.0958000.01337000.01613000.0679000.0719000.0761000.0606000.0500000.0447000.0450000.0489000.0343000.0426000.0-86000.0-9000.0137000.0252000.0229000.0156000.0149000.016000.012000.0-6000.0-4000.024000.012000.012000.07000.019000.0-1000.010000.018000.013000.0-1000.0-2000.03000.08000.015000.0-4000.0
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets-0.00.00.00.20.60.60.20.40.40.30.20.20.20.20.10.1-0.0-0.00.10.20.20.10.10.00.0-0.0-0.00.00.00.00.00.0-0.00.00.00.0-0.0-0.00.00.00.0-0.0

Stock Issued During Period Value New Issues

us-gaap:StockIssuedDuringPeriodValueNewIssues us-gaap:StatementEquityComponents, us-gaap:SubsidiarySaleOfStock

us-gaap:StockIssuedDuringPeriodValueNewIssues

us-gaap:AdditionalPaidInCapital, cytk:Underwriter


Stock
Period End2020-09-30
Value188
Percentage of StockIssuedDuringPeriodValueNewIssues100.0
Percentage of Assets0.0
Percentage of Assets us-gaap:AdditionalPaidInCapital cytk:Underwriter0.0

us-gaap:CommonStock, cytk:Underwriter


Stock
Period End2020-09-30
Value0.008
Percentage of StockIssuedDuringPeriodValueNewIssues0.0
Percentage of Assets0.0
Percentage of Assets us-gaap:CommonStock cytk:Underwriter0.0

us-gaap:StockIssuedDuringPeriodValueNewIssues us-gaap:SubsidiarySaleOfStock

cytk:Underwriter


Stock
Period End2020-09-30
Value188
Percentage of StockIssuedDuringPeriodValueNewIssues100.0
Percentage of Assets0.0
Percentage of Assets cytk:Underwriter0.0

Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue


Adjustments
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value7.0935.2614.6924.5273.5242.7832.8192.2822.2812.5722.5052.403
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Adjustments
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value7.0935.2614.6924.5273.5242.7832.8192.2822.2812.5722.5052.403
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.0

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value-29.496-29.5195214-27.439-30.135-19.055-20.268-24.677-26.907-12.327-32.235-26.846-29.807-24.071-25.483-9.376-17.822-12.429106.624-12.222-7.124-8.878-8.699-8.737-10.945-9.264-12.506-12.88-9.091-10.317
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-1037.5-450.8775.834.5-763.7-787.8-365.6-334.7-345.8-317.9-131.5-302.9-432.0-565.8133727.8-412.3-120.4-223.4-51.0230.7656.5-1488.7-326.2-518.0-472.5-480.1-1445.8-649.2-1187.7-1688.1-827.2-2618.5

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value18-5.276-173.618-101.0233443-105.26613-2.76719262.677-44.1882030398.44-28.865.813-7.592-10.21106.616-38.974-1.5095.0528.7934.2651.17211-8.64822
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax664.1-80.6-2582.8-242.3964.01137.0-2019.7226.0-38.8232.1282.725.2-711.0382.2-170905.6641.7108.4-361.723.9-169.9-1011.91275.3302.9-2273.9-82.0277.61161.6298.9111.31451.0-786.95777.4

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value3.175-3.5963.6412264.16-0.01112111224.4160.451102.978-0.5242.1941.4340.035397.516-0.5167.4830.0050.025-0.412562.6672.394-0.17919-0.2534.814-0.372
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax111.7-54.954.2542.9115.8-0.32323.9195.9313.852.24.896.147.9-9.9-12188.923.20.4498.630.9-11.5741.60.61.1-24.03044.4146.5316.2-12.51866.2-33.2438.0-94.4

Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value-7.44-38.391-117.8271391113-3.2015.273-5.048-2.84714-19.331-68.056-10.1958.88615
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-261.7-586.3-1752.9335.1316.1348.8-61.487.1-70.7-33.6156.0-181.7-1095.0-193.5-49366.7252.6

Amortization Of Financing Costs

us-gaap:AmortizationOfFinancingCosts

us-gaap:AmortizationOfFinancingCosts


Amortization
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value29000.027000.020000.019000.018000.017000.016000.016000.0
Percentage of AmortizationOfFinancingCosts100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AmortizationOfFinancingCosts us-gaap:DebtInstrument

cytk:ConvertibleSeniorNotesDue2026


Amortization
Period End2021-06-302021-03-312020-09-302020-06-30
Value14000.014000.013000.012000.0
Percentage of AmortizationOfFinancingCosts48.351.965.063.2

Depreciation Depletion And Amortization

us-gaap:DepreciationDepletionAndAmortization

us-gaap:DepreciationDepletionAndAmortization


Depreciation
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value0.5430.5370.4710.5360.4160.4080.3910.3360.280.286-0.320.2680.6180.6730.4390.4210.2240.1770.170.170.1510.1460.1470.1450.1370.1260.1220.1050.0880.1010.120.1240.1290.140.1440.1780.2290.2550.390.4230.4630.471
Percentage of DepreciationDepletionAndAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Increase Decrease In Accounts Receivable

us-gaap:IncreaseDecreaseInAccountsReceivable

us-gaap:IncreaseDecreaseInAccountsReceivable


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-30
Value-1.8130.094-0.5452.711-0.45-2.459-1.413-2.4174.8281.934-6.9258.920.199-1.075-8.88810.0-0.9090.885-66.97666
Percentage of IncreaseDecreaseInAccountsReceivable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value-29.496-29.5195214-27.439-30.135-19.055-20.268-24.677-26.907-12.327-32.235-26.846-29.807-24.071-25.483-9.376-17.822-12.429106.624-12.222-7.124-8.878-8.699-8.737-10.945-9.264-12.506-12.88-9.091-10.317
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-1037.5-450.8775.834.5-763.7-787.8-365.6-334.7-345.8-317.9-131.5-302.9-432.0-565.8133727.8-412.3-120.4-223.4-51.0230.7656.5-1488.7-326.2-518.0-472.5-480.1-1445.8-649.2-1187.7-1688.1-827.2-2618.5

Net Income Loss

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLoss


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value-61.554-47.104-43.93-3.175-40.78-39.405-30.64-29.573-32.113-29.366-26.468-22.017-27.523-30.281-40.484-32.357-29.081-25.8677.15731-11.611-12.455-9.229-8.849-10.551-8.8728.443-5.971-8.374-8.7446.531-12.588-15.041-12.619-11.455-10.044-8.943-9.928-11.877-10.639-13.632-11.712-11.613-12.341-13.144
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-2165.1-719.4-653.5-7.6-1135.0-1030.2-587.9-488.4-450.0-347.0-282.3-206.9-442.8-574.8224911.1-523.6-952.5-622.921.654.0-200.1-147.9-94.6-111.4-161.3-201.038.8-63.4-107.5-109.626.8-281.7-1490.7-1537.0-524.5-586.0-485.8-545.5-1569.0-745.6-1294.6-1535.0-1056.7-3132.2-2845.0

us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Net
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-61.554-47.104-3.175-40.78-39.405-29.573-32.113-29.366-26.468-22.017-27.523-30.281
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-2165.1-719.4-7.6-1135.0-1030.2-488.4-450.0-347.0-282.3-206.9-442.8-574.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.0

Profit Loss

us-gaap:ProfitLoss

us-gaap:ProfitLoss


Profit
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302014-06-302014-03-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value-61.554-47.104-43.93-3.175-40.78-39.405-30.64-29.573-32.113-29.366-26.468-22.017-27.523-30.281-40.485-32.357-8.374-8.744-15.041-12.619-11.456-10.044-8.942-9.928-11.878-10.638-13.632-11.712-11.613-12.341
Percentage of ProfitLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-2165.1-719.4-653.5-7.6-1135.0-1030.2-587.9-488.4-450.0-347.0-282.3-206.9-442.8-574.8224916.7-523.6-107.5-109.6-1490.7-1537.0-524.5-586.0-485.7-545.5-1569.1-745.5-1294.6-1535.0-1056.7-3132.2

Share Based Compensation

us-gaap:ShareBasedCompensation

us-gaap:ShareBasedCompensation


Share
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value7.0935.2614.8774.6924.5273.5242.8752.7832.8192.2822.442.4472.2191.9221.881.8661.7891.6111.3481.1211.2020.8960.8860.8910.8590.6940.6560.8451.130.9660.9071.0640.8690.9430.8410.7360.7310.7610.8521.159
Percentage of ShareBasedCompensation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value18-5.276-173.618-101.0233443-105.26613-2.76719262.677-44.1882030398.44-28.865.813-7.592-10.21106.616-38.974-1.5095.0528.7934.2651.17211-8.64822
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax664.1-80.6-2582.8-242.3964.01137.0-2019.7226.0-38.8232.1282.725.2-711.0382.2-170905.6641.7108.4-361.723.9-169.9-1011.91275.3302.9-2273.9-82.0277.61161.6298.9111.31451.0-786.95777.4

Payments To Acquire Property Plant And Equipment

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value8.7926.6266.5552.5920.8641.0411.3061.0060.050.2570.210.3580.060.2610.780.4510.2581.3880.8540.3060.0160.420.2040.0530.1750.130.2470.10.4240.3330.2520.0690.0440.1770.0590.0460.0070.0130.0250.1010.1420.1750.0870.132
Percentage of PaymentsToAcquirePropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value3.175-3.5963.6412264.16-0.01112111224.4160.451102.978-0.5242.1941.4340.035397.516-0.5167.4830.0050.025-0.412562.6672.394-0.17919-0.2534.814-0.372
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax111.7-54.954.2542.9115.8-0.32323.9195.9313.852.24.896.147.9-9.9-12188.923.20.4498.630.9-11.5741.60.61.1-24.03044.4146.5316.2-12.51866.2-33.2438.0-94.4

Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice


Share
Period End2020-12-312019-12-312018-12-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-12-312010-12-312009-12-31
Value10.028.598.729.199.179.028.89.279.269.269.3510.9410.9411.0111.4512.6212.9413.2313.4415.1515.1815.162.553.153.173.123.664.324.58
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Unrecognized Tax Benefits

us-gaap:UnrecognizedTaxBenefits

us-gaap:UnrecognizedTaxBenefits


Unrecognized
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value109.9229.4759.3657.5656.7156.2746.171
Percentage of UnrecognizedTaxBenefits100.0100.0100.0100.0100.0100.0100.0100.0

Deferred Tax Assets Valuation Allowance

us-gaap:DeferredTaxAssetsValuationAllowance

us-gaap:DeferredTaxAssetsValuationAllowance


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value274245221204216218204203190169150
Percentage of DeferredTaxAssetsValuationAllowance100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cytk:AdditionalLeaseAgreementAllowancesForTenantImprovements us-gaap:StatementGeographical, us-gaap:LeaseContractualTerm

cytk:AdditionalLeaseAgreementAllowancesForTenantImprovements

stpr:CA, cytk:OfficeSpaceLeaseExpansion


Additional
Period End2021-01-31
Value8200000.0
Percentage of AdditionalLeaseAgreementAllowancesForTenantImprovements100.0

cytk:AdditionalTenantImprovementAllowancesInterestRatePercentage us-gaap:StatementGeographical, us-gaap:LeaseContractualTerm

cytk:AdditionalTenantImprovementAllowancesInterestRatePercentage

stpr:CA, cytk:OfficeSpaceLeaseExpansion


Additional
Period End2021-01-31
Value8.0
Percentage of AdditionalTenantImprovementAllowancesInterestRatePercentage100.0

cytk:AllocatedTransactionPriceOfCollaborativeArrangements us-gaap:MajorCustomers, us-gaap:TypeOfArrangement

cytk:AllocatedTransactionPriceOfCollaborativeArrangements

cytk:RTWInvestmentsLP, us-gaap:CollaborativeArrangement


Allocated
Period End2020-12-312020-07-14
Value0.0160
Percentage of AllocatedTransactionPriceOfCollaborativeArrangements0.0100.0

cytk:BaseRentIncreaseDecreaseDuringInitialLeaseTerm us-gaap:StatementGeographical, us-gaap:LeaseContractualTerm

cytk:BaseRentIncreaseDecreaseDuringInitialLeaseTerm

stpr:CA, cytk:OfficeSpaceLeaseExpansion


Base
Period End2021-01-31
Value100000.0
Percentage of BaseRentIncreaseDecreaseDuringInitialLeaseTerm100.0

cytk:ChangeInEarningsPerShare us-gaap:ChangeInAccountingEstimateByType

cytk:ChangeInEarningsPerShare

us-gaap:ChangeInAccountingMethodAccountedForAsChangeInEstimate


Change
Period End2021-06-302021-03-31
Value00.04
Percentage of ChangeInEarningsPerShare0.0100.0

cytk:ChangeInNetIncomeLoss us-gaap:ChangeInAccountingEstimateByType

cytk:ChangeInNetIncomeLoss

us-gaap:ChangeInAccountingMethodAccountedForAsChangeInEstimate


Change
Period End2021-06-302021-03-31
Value100000.0-2900000.0
Percentage of ChangeInNetIncomeLoss100.0100.0

cytk:DebtInstrumentConvertibleThresholdLessThanPercentageOfStockPriceTrigger us-gaap:DebtConversionByUniqueDescription, us-gaap:DebtInstrument

cytk:DebtInstrumentConvertibleThresholdLessThanPercentageOfStockPriceTrigger

cytk:DebtInstrumentConvertibleCovenantTwo, cytk:ConvertibleSeniorNotesDue2026


Debt
Period End2021-06-302021-03-312020-12-31
Value098.00
Percentage of DebtInstrumentConvertibleThresholdLessThanPercentageOfStockPriceTrigger0.0100.00.0

cytk:ExcessAmountPaidOverFairValueOfShares us-gaap:TypeOfArrangement

cytk:ExcessAmountPaidOverFairValueOfShares

cytk:CommonStockPurchaseAgreement


Excess
Period End2020-07-14
Value13
Percentage of ExcessAmountPaidOverFairValueOfShares100.0

cytk:FairValueOfCommonStock us-gaap:MajorCustomers, us-gaap:StatementEquityComponents, us-gaap:TypeOfArrangement

cytk:FairValueOfCommonStock

cytk:RTWInvestmentsLP, us-gaap:CommonStock, us-gaap:CollaborativeArrangement


Fair
Period End2020-12-312020-07-14
Value0.036
Percentage of FairValueOfCommonStock0.0100.0

cytk:FairValueOfCommonStock us-gaap:TypeOfArrangement

cytk:CommonStockPurchaseAgreement


Fair
Period End2020-07-14
Value36
Percentage of FairValueOfCommonStock100.0

cytk:FairValueOfRoyalty us-gaap:MajorCustomers, us-gaap:ProductOrService, us-gaap:TypeOfArrangement

cytk:FairValueOfRoyalty

cytk:RTWInvestmentsLP, us-gaap:Royalty, us-gaap:CollaborativeArrangement


Fair
Period End2020-12-312020-07-14
Value0.087
Percentage of FairValueOfRoyalty0.0100.0

cytk:FairValueOfRoyalty us-gaap:TypeOfArrangement

cytk:RoyaltyPurchaseAgreement


Fair
Period End2020-07-14
Value87
Percentage of FairValueOfRoyalty100.0

cytk:FinalPaymentFeePercentage us-gaap:CreditFacility, us-gaap:DebtInstrument, us-gaap:LongtermDebtType

cytk:FinalPaymentFeePercentage

cytk:TwoThousandNineteenTermLoan, cytk:OxfordAndSiliconValleyBank, cytk:LoanAndSecurityAgreement


Final
Period End2021-06-302021-03-312020-12-31
Value06.00
Percentage of FinalPaymentFeePercentage0.0100.00.0

cytk:IncreaseDecreaseInOperatingLeaseLiabilities

cytk:IncreaseDecreaseInOperatingLeaseLiabilities


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value159.816-1.235-1.206-1.139-1.112-1.022-1.0-0.938-0.9160.00.00.00.0
Percentage of IncreaseDecreaseInOperatingLeaseLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.0

cytk:IncreaseDecreaseInOperatingLeaseRightOfUseAssets

cytk:IncreaseDecreaseInOperatingLeaseRightOfUseAssets


Increase
Period End2021-06-302021-03-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-2002000.0-1124000.0-1042000.0-1016000.0-921000.0-898000.0-877000.0-856000.00000
Percentage of IncreaseDecreaseInOperatingLeaseRightOfUseAssets100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.0

cytk:IncreaseDecreaseInOperatingLeaseRightOfUseAssetsAndOtherAssets

cytk:IncreaseDecreaseInOperatingLeaseRightOfUseAssetsAndOtherAssets


Increase
Period End2020-12-312019-12-31
Value1884000.0-921000.0
Percentage of IncreaseDecreaseInOperatingLeaseRightOfUseAssetsAndOtherAssets100.0100.0

cytk:IncreaseDecreaseInPrepaidAndOtherCurrentAssets

cytk:IncreaseDecreaseInPrepaidAndOtherCurrentAssets


Increase
Period End2020-12-312019-12-31
Value2477000.02117000.0
Percentage of IncreaseDecreaseInPrepaidAndOtherCurrentAssets100.0100.0

cytk:InterestAccretion

cytk:InterestAccretion


Interest
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value2.8712.7955.4615.9125.6895.3215.0644.819
Percentage of InterestAccretion100.0100.0100.0100.0100.0100.0100.0100.0

cytk:InterestReceivableAndAmortizationOnInvestments

cytk:InterestReceivableAndAmortizationOnInvestments


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value1083000.0933000.0-792000.0-429000.0-266000.0293000.0-1004000.0-375000.0-675000.0-533000.0-440000.0-737000.0-596000.096000.00000
Percentage of InterestReceivableAndAmortizationOnInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.0

cytk:NetShareSettlement

cytk:NetShareSettlement


Net
Period End2021-03-31
Value-418000.0
Percentage of NetShareSettlement100.0

cytk:NetShareSettlement us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Net
Period End2021-03-31
Value-418000.0
Percentage of NetShareSettlement100.0

cytk:NonCashInterestExpenseOnLiabilityRelatedToSaleOfFutureRoyalties

cytk:NonCashInterestExpenseOnLiabilityRelatedToSaleOfFutureRoyalties


Non
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-30
Value2.8712.7955.6515.4615.9125.6895.5335.3215.0644.8194.7414.5594.3384.1294.0623.9063.7172.3070.00.0
Percentage of NonCashInterestExpenseOnLiabilityRelatedToSaleOfFutureRoyalties100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.0

cytk:NonCashInterestExpenseRelatedToDebt

cytk:NonCashInterestExpenseRelatedToDebt


Non
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value1749000.01676000.01648000.01577000.01724000.0291000.0333000.0183000.0-176000.0411000.0177000.0
Percentage of NonCashInterestExpenseRelatedToDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cytk:NonCashInterestExpenseRelatedToSaleOfFutureRoyalties

cytk:NonCashInterestExpenseRelatedToSaleOfFutureRoyalties


Non
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value2.92.8225.6735.4815.9325.7065.5335.3215.0644.8194.7414.5594.3384.1294.0743.9183.7292.3070.00.00.00.0
Percentage of NonCashInterestExpenseRelatedToSaleOfFutureRoyalties100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.0

cytk:NonCashInterestExpenseRelatedToSaleOfFutureRoyalties us-gaap:ChangeInAccountingEstimateByType

us-gaap:ChangeInAccountingMethodAccountedForAsChangeInEstimate


Non
Period End2021-03-312020-12-31
Value2.85.7
Percentage of NonCashInterestExpenseRelatedToSaleOfFutureRoyalties99.2100.5

cytk:NonCashInterestExpenseRelatedToSaleOfFutureRoyalties us-gaap:ResearchAndDevelopmentArrangementContractToPerformForOthersByType

us-gaap:RoyaltyAgreementTerms


Non
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value2.92.85.55.95.75.55.35.14.84.84.64.34.1-4.0623.93.7-2.295
Percentage of NonCashInterestExpenseRelatedToSaleOfFutureRoyalties100.099.2100.399.599.999.499.6100.799.6101.2100.999.199.3-99.799.599.2-99.5

cytk:PaymentForPurchaseOfCappedCallOptionsAssociatedWithConvertibleNotes

cytk:PaymentForPurchaseOfCappedCallOptionsAssociatedWithConvertibleNotes


Payment
Period End2021-06-302021-03-31
Value0.013
Percentage of PaymentForPurchaseOfCappedCallOptionsAssociatedWithConvertibleNotes0.0100.0

cytk:PaymentsForFutureRoyalties us-gaap:ResearchAndDevelopmentArrangementContractToPerformForOthersByType

cytk:PaymentsForFutureRoyalties

cytk:RoyaltyPurchaseAgreement


Payments
Period End2020-07-14
Value85
Percentage of PaymentsForFutureRoyalties100.0

cytk:PaymentsForFutureRoyalties us-gaap:ResearchAndDevelopmentArrangementContractToPerformForOthersByType, us-gaap:SubsequentEventType

cytk:RoyaltyPurchaseAgreement, us-gaap:SubsequentEvent


Payments
Period End2020-07-14
Value85
Percentage of PaymentsForFutureRoyalties100.0

cytk:PercentageOfLeaseSecurityDeposit us-gaap:StatementGeographical, us-gaap:StatementScenario, us-gaap:LeaseContractualTerm

cytk:PercentageOfLeaseSecurityDeposit

stpr:CA, srt:ScenarioForecast, cytk:OfficeAndLaboratory


Percentage
Period End2021-01-01
Value0.5
Percentage of PercentageOfLeaseSecurityDeposit100.0

cytk:PotentialAmountsReceivableUnderCollaborationAgreement us-gaap:MajorCustomers, us-gaap:Range, us-gaap:ResearchAndDevelopmentArrangementContractToPerformForOthersByType

cytk:PotentialAmountsReceivableUnderCollaborationAgreement

cytk:AstellasOSSAAgreement, srt:Minimum, cytk:TwoThousandSixteenAmendment


Potential
Period End2020-12-312020-09-302020-06-302020-03-31
Value-50.00.00.0250
Percentage of PotentialAmountsReceivableUnderCollaborationAgreement100.00.00.0100.0

cytk:PrepaymentFeePercentageAfterYearTwo us-gaap:CreditFacility, us-gaap:DebtInstrument, us-gaap:LongtermDebtType

cytk:PrepaymentFeePercentageAfterYearTwo

cytk:TwoThousandNineteenTermLoan, cytk:OxfordAndSiliconValleyBank, cytk:TermLoanAgreement


Prepayment
Period End2021-06-302021-03-312020-12-31
Value01.00
Percentage of PrepaymentFeePercentageAfterYearTwo0.0100.00.0

cytk:PrepaymentFeePercentageInFiscalYear us-gaap:CreditFacility, us-gaap:DebtInstrument, us-gaap:LongtermDebtType

cytk:PrepaymentFeePercentageInFiscalYear

cytk:TwoThousandNineteenTermLoan, cytk:OxfordAndSiliconValleyBank, cytk:TermLoanAgreement


Prepayment
Period End2021-06-302021-03-312020-12-31
Value03.00
Percentage of PrepaymentFeePercentageInFiscalYear0.0100.00.0

cytk:PrepaymentFeePercentageInYearTwo us-gaap:CreditFacility, us-gaap:DebtInstrument, us-gaap:LongtermDebtType

cytk:PrepaymentFeePercentageInYearTwo

cytk:TwoThousandNineteenTermLoan, cytk:OxfordAndSiliconValleyBank, cytk:TermLoanAgreement


Prepayment
Period End2021-06-302021-03-312020-12-31
Value02.00
Percentage of PrepaymentFeePercentageInYearTwo0.0100.00.0

cytk:ProceedsFromClaimsSettlements

cytk:ProceedsFromClaimsSettlements


Proceeds
Period End2020-12-312020-09-302020-06-302020-03-312019-06-302019-03-31
Value0002151000.000
Percentage of ProceedsFromClaimsSettlements0.00.00.0100.00.00.0

cytk:ProceedsFromIssuanceOfUnderwrittenPublicOfferingOfCommonStockNet

cytk:ProceedsFromIssuanceOfUnderwrittenPublicOfferingOfCommonStockNet


Proceeds
Period End2020-12-31
Value0.0
Percentage of ProceedsFromIssuanceOfUnderwrittenPublicOfferingOfCommonStockNet0.0

cytk:StockIssueDuringPeriodPrivatePlacementShare us-gaap:TypeOfArrangement

cytk:StockIssueDuringPeriodPrivatePlacementShare

cytk:CommonStockPurchaseAgreement


Stock
Period End2020-07-14
Value2000000.0
Percentage of StockIssueDuringPeriodPrivatePlacementShare100.0

cytk:StockIssueDuringPeriodPrivatePlacementValue

cytk:StockIssueDuringPeriodPrivatePlacementValue


Stock
Period End2020-09-30
Value36
Percentage of StockIssueDuringPeriodPrivatePlacementValue100.0

cytk:StockIssueDuringPeriodPrivatePlacementValue us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Stock
Period End2020-09-30
Value36
Percentage of StockIssueDuringPeriodPrivatePlacementValue100.0

us-gaap:CommonStock


Stock
Period End2020-09-30
Value0.002
Percentage of StockIssueDuringPeriodPrivatePlacementValue0.0

us-gaap:AccretionAmortizationOfDiscountsAndPremiumsInvestments us-gaap:DebtInstrument

us-gaap:AccretionAmortizationOfDiscountsAndPremiumsInvestments

cytk:ConvertibleSeniorNotesDue2026


Accretion
Period End2021-06-302021-03-31
Value1445000.01371000.0
Percentage of AccretionAmortizationOfDiscountsAndPremiumsInvestments100.0100.0

us-gaap:AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation

us-gaap:AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation


Adjustments
Period End2021-03-312020-03-312019-03-312018-12-312018-06-302018-03-31
Value4449000.02255000.0732000.000866000.0
Percentage of AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation100.0100.0100.00.00.0100.0

us-gaap:AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Adjustments
Period End2021-03-312020-03-312019-03-312018-12-312018-06-302018-03-31
Value4449000.02255000.0732000.000866000.0
Percentage of AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation100.0100.0100.00.00.0100.0

us-gaap:AmortizationOfDebtDiscountPremium us-gaap:CreditFacility, us-gaap:DebtInstrument, us-gaap:LongtermDebtType

us-gaap:AmortizationOfDebtDiscountPremium

cytk:TwoThousandNineteenTermLoan, cytk:OxfordAndSiliconValleyBank, cytk:LoanAndSecurityAgreement


Amortization
Period End2020-12-312020-09-302020-06-302020-03-31
Value000200000.0
Percentage of AmortizationOfDebtDiscountPremium0.00.00.0100.0

us-gaap:AmortizationOfDebtDiscountPremium us-gaap:DebtInstrument

cytk:ConvertibleSeniorNotesDue2026


Amortization
Period End2020-09-302020-06-302020-03-31
Value1346000.01276000.01237000.0
Percentage of AmortizationOfDebtDiscountPremium0.00.0618.5

us-gaap:AssetsFairValueAdjustment us-gaap:TypeOfArrangement

us-gaap:AssetsFairValueAdjustment

cytk:CommonStockPurchaseAgreement


Assets
Period End2020-07-14
Value36
Percentage of AssetsFairValueAdjustment100.0

us-gaap:CapitalExpendituresIncurredButNotYetPaid

us-gaap:CapitalExpendituresIncurredButNotYetPaid


Capital
Period End2021-06-302021-03-31
Value5495000.03763000.0
Percentage of CapitalExpendituresIncurredButNotYetPaid100.0100.0

us-gaap:DebtInstrumentConvertibleIfConvertedValueInExcessOfPrincipal us-gaap:DebtInstrument

us-gaap:DebtInstrumentConvertibleIfConvertedValueInExcessOfPrincipal

cytk:ConvertibleSeniorNotesDue2026


Debt
Period End2021-06-302021-03-31
Value-57.9249
Percentage of DebtInstrumentConvertibleIfConvertedValueInExcessOfPrincipal100.0100.0

us-gaap:DebtInstrumentConvertibleThresholdPercentageOfStockPriceTrigger us-gaap:DebtConversionByUniqueDescription, us-gaap:DebtInstrument

us-gaap:DebtInstrumentConvertibleThresholdPercentageOfStockPriceTrigger

cytk:DebtInstrumentConvertibleCovenantOne, cytk:ConvertibleSeniorNotesDue2026


Debt
Period End2021-06-302021-03-312020-12-31
Value0127.50
Percentage of DebtInstrumentConvertibleThresholdPercentageOfStockPriceTrigger0.0100.00.0

us-gaap:EquitySecuritiesFvNiUnrealizedGainLoss

us-gaap:EquitySecuritiesFvNiUnrealizedGainLoss


Equity
Period End2020-09-302020-06-30
Value500000.0700000.0
Percentage of EquitySecuritiesFvNiUnrealizedGainLoss100.0100.0

us-gaap:IncreaseDecreaseInAccountsPayableTrade

us-gaap:IncreaseDecreaseInAccountsPayableTrade


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value1667000.0-4047000.01312000.03818000.0-607000.0-4633000.04748000.0-1782000.02647000.0-1217000.01740000.0688000.0-1087000.0-2831000.0-5000.03350000.0-1162000.0-726000.03032000.0-2175000.02303000.0-1462000.0139000.0305000.0216000.095000.0-315000.0657000.0-407000.0-2113000.01759000.0-31000.0728000.0-800000.0356000.0471000.0120000.0-257000.0-260000.0463000.0-8000.0-33000.049000.0-145000.0
Percentage of IncreaseDecreaseInAccountsPayableTrade100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInAccruedLiabilities

us-gaap:IncreaseDecreaseInAccruedLiabilities


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value6.154-3.121.4724.1912.518-1.064-0.2651.32-0.757-2.4660.046-0.512-2.6641.0670.8983.78-4.0630.151-0.1777.9791.508-0.3651.6540.7592.0-1.418-0.636-0.904-0.765-0.56-1.6393.2042.061-0.1032.1870.038-0.5310.404-0.216-0.454-0.492-1.1040.8590.016
Percentage of IncreaseDecreaseInAccruedLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets

us-gaap:IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets


Increase
Period End2021-06-302021-03-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value8258000.0-2677000.01109000.0-949000.02117000.01479000.0-717000.0983000.0209000.0162000.0-782000.0-1406000.0-147000.0-355000.01424000.01239000.0-215000.0-3678000.03558000.01042000.0-830000.0211000.0299000.0716000.0-547000.0-205000.0418000.060000.0-74000.0-288000.0228000.0-684000.0-736000.0677000.0424000.0-45000.0-42000.0-726000.0-249000.01255000.0-83000.0-565000.0
Percentage of IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InvestmentIncomeInterest

us-gaap:InvestmentIncomeInterest


Investment
Period End2021-06-302021-03-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-30
Value0.20.31.40.71.31.01.01.10.91.31.10.80.7740.6940.4890.1670.1140.1050.0620.0420.0380.0380.0370.0230.0260.0260.0260.7180.0230.0230.0280.0310.030.0080.0140.0180.0360.027
Percentage of InvestmentIncomeInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingLeaseExpense

us-gaap:OperatingLeaseExpense


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value5300000.01500000.01500000.01400000.01400000.01400000.01300000.01300000.01300000.01300000.01200000.01300000.01300000.01200000.0
Percentage of OperatingLeaseExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingLeasePayments

us-gaap:OperatingLeasePayments


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value1500000.01100000.01500000.01600000.01600000.02000000.01500000.01200000.0
Percentage of OperatingLeasePayments100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax

us-gaap:OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value-72000.0-99000.0-809000.0-379000.0-276000.0934000.0-40000.0-42000.0155000.0106000.053000.03000.0-39000.0146000.0-83000.0512000.0-78000.0-145000.0-115000.023000.073000.07000.0134000.02000.018000.0-1000.0-28000.011000.006000.0-12000.019000.0-10000.0-8000.0
Percentage of OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0

us-gaap:PaymentsForTenantImprovements us-gaap:StatementGeographical, us-gaap:LeaseContractualTerm

us-gaap:PaymentsForTenantImprovements

stpr:CA, cytk:OfficeAndLaboratory


Payments
Period End2021-06-302021-03-31
Value0.043
Percentage of PaymentsForTenantImprovements0.0100.0

us-gaap:PaymentsToAcquireAvailableForSaleSecuritiesDebt

us-gaap:PaymentsToAcquireAvailableForSaleSecuritiesDebt


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value105662691381710136415841515610724251268132659.26205020291549135.55732551129317.761115416107.14915187.1232815
Percentage of PaymentsToAcquireAvailableForSaleSecuritiesDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromIssuanceOfCommonStock us-gaap:SubsequentEventType, us-gaap:TypeOfArrangement

us-gaap:ProceedsFromIssuanceOfCommonStock

us-gaap:SubsequentEvent, cytk:CommonStockPurchaseAgreement


Proceeds
Period End2020-07-14
Value50
Percentage of ProceedsFromIssuanceOfCommonStock100.0

us-gaap:ProceedsFromIssuanceOfCommonStock us-gaap:TypeOfArrangement

cytk:CommonStockPurchaseAgreement


Proceeds
Period End2020-07-14
Value50
Percentage of ProceedsFromIssuanceOfCommonStock100.0

us-gaap:ProceedsFromIssuanceOfPrivatePlacement

us-gaap:ProceedsFromIssuanceOfPrivatePlacement


Proceeds
Period End2020-12-31
Value0.0
Percentage of ProceedsFromIssuanceOfPrivatePlacement0.0

us-gaap:ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions

us-gaap:ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions


Proceeds
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value3596000.02132000.01226000.0-164000.02162000.0646000.0459000.0
Percentage of ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities

us-gaap:ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities


Proceeds
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value13364994052553256
Percentage of ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromSaleOfAvailableForSaleSecuritiesDebt

us-gaap:ProceedsFromSaleOfAvailableForSaleSecuritiesDebt


Proceeds
Period End2021-06-302021-03-312019-12-312019-09-30
Value03300000.000
Percentage of ProceedsFromSaleOfAvailableForSaleSecuritiesDebt0.0100.00.00.0

us-gaap:RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability

us-gaap:RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability


Right
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value5.321770.00.00.01.1060.00.00.001100.00.00.00.0
Percentage of RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability100.0100.00.00.00.0100.00.00.0100.0100.00.00.00.00.0

us-gaap:SaleOfStockConsiderationReceivedOnTransaction us-gaap:SubsequentEventType, us-gaap:SubsidiarySaleOfStock

us-gaap:SaleOfStockConsiderationReceivedOnTransaction

us-gaap:SubsequentEvent, cytk:UnderwrittenPublicOffering


Sale
Period End2021-07-23
Value297
Percentage of SaleOfStockConsiderationReceivedOnTransaction100.0

us-gaap:SaleOfStockConsiderationReceivedOnTransaction us-gaap:SubsidiarySaleOfStock

cytk:UnderwrittenPublicOffering


Sale
Period End2020-07-31
Value189
Percentage of SaleOfStockConsiderationReceivedOnTransaction0.0

us-gaap:SaleOfStockConsiderationReceivedPerTransaction us-gaap:SubsequentEventType, us-gaap:SubsidiarySaleOfStock

us-gaap:SaleOfStockConsiderationReceivedPerTransaction

us-gaap:SubsequentEvent, cytk:UnderwrittenPublicOffering


Sale
Period End2021-07-23
Value316
Percentage of SaleOfStockConsiderationReceivedPerTransaction100.0

us-gaap:SaleOfStockConsiderationReceivedPerTransaction us-gaap:SubsidiarySaleOfStock

cytk:UnderwrittenPublicOffering


Sale
Period End2020-07-31
Value201
Percentage of SaleOfStockConsiderationReceivedPerTransaction0.0

us-gaap:SaleOfStockNumberOfSharesIssuedInTransaction us-gaap:SubsidiarySaleOfStock

us-gaap:SaleOfStockNumberOfSharesIssuedInTransaction

cytk:UnderwrittenPublicOffering


Sale
Period End2020-07-31
Value8400000.0
Percentage of SaleOfStockNumberOfSharesIssuedInTransaction100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue

us-gaap:PerformanceShares


Share
Period End2021-05-31
Value25.32
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue100.0

us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage us-gaap:AwardType, us-gaap:Vesting

us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage

us-gaap:PerformanceShares, us-gaap:ShareBasedCompensationAwardTrancheOne


Sharebased
Period End2021-05-31
Value50.0
Percentage of SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage100.0

us-gaap:PerformanceShares, us-gaap:ShareBasedCompensationAwardTrancheTwo


Sharebased
Period End2021-05-31
Value50.0
Percentage of SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage100.0

us-gaap:StockIssuedDuringPeriodSharesNewIssues us-gaap:SubsequentEventType, us-gaap:SubsidiarySaleOfStock

us-gaap:StockIssuedDuringPeriodSharesNewIssues

us-gaap:SubsequentEvent, cytk:UnderwrittenPublicOffering


Stock
Period End2020-07-21
Value1.09375
Percentage of StockIssuedDuringPeriodSharesNewIssues100.0

us-gaap:StockIssuedDuringPeriodSharesNewIssues us-gaap:SubsequentEventType, us-gaap:TypeOfArrangement

us-gaap:SubsequentEvent, cytk:CommonStockPurchaseAgreement


Stock
Period End2020-07-14
Value2.0
Percentage of StockIssuedDuringPeriodSharesNewIssues0.0

us-gaap:StockIssuedDuringPeriodSharesNewIssues us-gaap:TypeOfArrangement

cytk:CommonStockPurchaseAgreement


Stock
Period End2020-07-14
Value2.0
Percentage of StockIssuedDuringPeriodSharesNewIssues0.0

us-gaap:StockIssuedDuringPeriodSharesStockOptionsExercised us-gaap:ClassOfWarrantOrRight, us-gaap:RelatedPartyTransactionsByRelatedParty, us-gaap:SubsequentEventType

us-gaap:StockIssuedDuringPeriodSharesStockOptionsExercised

cytk:Warrant1, cytk:OTALLC, us-gaap:SubsequentEvent


Stock
Period End2020-07-16
Value51214.0
Percentage of StockIssuedDuringPeriodSharesStockOptionsExercised100.0

cytk:Warrant2, cytk:OTALLC, us-gaap:SubsequentEvent


Stock
Period End2020-07-16
Value48892.0
Percentage of StockIssuedDuringPeriodSharesStockOptionsExercised95.5

cytk:Warrant3, cytk:OTALLC, us-gaap:SubsequentEvent


Stock
Period End2020-07-16
Value25352.0
Percentage of StockIssuedDuringPeriodSharesStockOptionsExercised49.5

us-gaap:StockIssuedDuringPeriodValueConversionOfUnits us-gaap:DebtInstrument

us-gaap:StockIssuedDuringPeriodValueConversionOfUnits

cytk:ConvertibleSeniorNotesDue2026


Stock
Period End2021-06-302021-03-31
Value-57.9387
Percentage of StockIssuedDuringPeriodValueConversionOfUnits100.0100.0

us-gaap:StockIssuedDuringPeriodValueEmployeeStockPurchasePlan

us-gaap:StockIssuedDuringPeriodValueEmployeeStockPurchasePlan


Stock
Period End2021-06-302020-06-302019-06-302018-12-312018-06-30
Value969000.0826000.0548000.0392000.0536000.0
Percentage of StockIssuedDuringPeriodValueEmployeeStockPurchasePlan100.0100.0100.0100.0100.0

us-gaap:StockIssuedDuringPeriodValueEmployeeStockPurchasePlan us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Stock
Period End2021-06-302020-06-302019-06-302018-12-312018-06-30
Value969000.0826000.0548000.0392000.0536000.0
Percentage of StockIssuedDuringPeriodValueEmployeeStockPurchasePlan100.0100.0100.0100.0100.0

us-gaap:StockIssuedDuringPeriodValueStockOptionsExercised

us-gaap:StockIssuedDuringPeriodValueStockOptionsExercised


Stock
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value2207000.01272000.01227000.03334000.093000.0459000.0441000.031000.060000.0329000.02442000.0342000.0
Percentage of StockIssuedDuringPeriodValueStockOptionsExercised100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StockIssuedDuringPeriodValueStockOptionsExercised us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Stock
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value2206000.01271000.01227000.03333000.093000.0459000.0441000.031000.060000.0329000.02441000.0342000.0
Percentage of StockIssuedDuringPeriodValueStockOptionsExercised100.099.9100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CommonStock


Stock
Period End2021-06-302021-03-312020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value1000.01000.01000.00000001000.00
Percentage of StockIssuedDuringPeriodValueStockOptionsExercised0.00.10.00.00.00.00.00.00.00.00.0

cytk:AccountReceivableAndDeferredRevenueUnrecognized us-gaap:TypeOfArrangement

cytk:AccountReceivableAndDeferredRevenueUnrecognized

cytk:RoyaltyPurchaseAgreement


Account
Period End2020-09-30
Value85
Percentage of AccountReceivableAndDeferredRevenueUnrecognized100.0

cytk:AccruedClinicalAndPreclinicalCostsCurrent

cytk:AccruedClinicalAndPreclinicalCostsCurrent


Accrued
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312018-12-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302015-12-312014-12-312013-12-312012-12-312011-12-31
Value105.5766.1243.0043.6552.4462.2158.6188.37106.78212109.9523.4460.9724.9752.171.664
Percentage of AccruedClinicalAndPreclinicalCostsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cytk:ClassOfWarrantOrRightOutstandingWeightedAverageExercisePrice us-gaap:CreditFacility, us-gaap:DebtInstrument, us-gaap:LongtermDebtType

cytk:ClassOfWarrantOrRightOutstandingWeightedAverageExercisePrice

cytk:TwoThousandNineteenTermLoan, cytk:OxfordAndSiliconValleyBank, cytk:LoanAndSecurityAgreement


Class
Period End2020-12-312020-09-30
Value9.129.26
Percentage of ClassOfWarrantOrRightOutstandingWeightedAverageExercisePrice100.0100.0

cytk:ConvertibleNotesNet

cytk:ConvertibleNotesNet


Convertible
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312018-12-31
Value929089888685840.0
Percentage of ConvertibleNotesNet100.0100.0100.0100.0100.0100.0100.00.0

cytk:ConvertibleNotesNet us-gaap:DebtInstrument

cytk:ConvertibleSeniorNotesDue2026


Convertible
Period End2021-06-302021-03-31
Value9290
Percentage of ConvertibleNotesNet100.0100.0

cytk:DeferredTaxAssetsCapitalizedResearchAndDevelopment

cytk:DeferredTaxAssetsCapitalizedResearchAndDevelopment


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value2.373.9494.6146.432111315204.9326.582
Percentage of DeferredTaxAssetsCapitalizedResearchAndDevelopment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cytk:DeferredTaxAssetsLiabilityRelatedToSaleOfFutureRoyalties

cytk:DeferredTaxAssetsLiabilityRelatedToSaleOfFutureRoyalties


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value363526240.00.0
Percentage of DeferredTaxAssetsLiabilityRelatedToSaleOfFutureRoyalties100.0100.0100.0100.00.00.0

cytk:DeferredTaxAssetsLongTermLeaseLiability

cytk:DeferredTaxAssetsLongTermLeaseLiability


Deferred
Period End2020-12-312019-12-312018-12-31
Value718000.01674000.00
Percentage of DeferredTaxAssetsLongTermLeaseLiability100.0100.00.0

cytk:DeferredTaxLiabilitiesAccountingMethodChange

cytk:DeferredTaxLiabilitiesAccountingMethodChange


Deferred
Period End2020-12-312019-12-312018-12-312017-12-31
Value927000.02047000.02682000.00
Percentage of DeferredTaxLiabilitiesAccountingMethodChange100.0100.0100.00.0

cytk:ImputedInterestRateOnUnamortizedLiability us-gaap:ChangeInAccountingEstimateByType

cytk:ImputedInterestRateOnUnamortizedLiability

us-gaap:ChangeInAccountingMethodAccountedForAsChangeInEstimate


Imputed
Period End2021-03-312020-12-31
Value7.015.0
Percentage of ImputedInterestRateOnUnamortizedLiability100.0100.0

cytk:ImputedInterestRateOnUnamortizedLiability us-gaap:ResearchAndDevelopmentArrangementContractToPerformForOthersByType

us-gaap:RoyaltyAgreementTerms


Imputed
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value7.07.015.015.00.170.17
Percentage of ImputedInterestRateOnUnamortizedLiability0.0100.0100.00.00.00.0

cytk:IncreaseInNumberOfAuthorizedSharesReservedForIssuance us-gaap:PlanName

cytk:IncreaseInNumberOfAuthorizedSharesReservedForIssuance

cytk:TwoThousandAndFourEquityIncentivePlan


Increase
Period End2020-12-312020-09-302020-06-302020-05-31
Value4100000.04100000.04100000.0800000.0
Percentage of IncreaseInNumberOfAuthorizedSharesReservedForIssuance100.0100.0100.0100.0

cytk:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFour

cytk:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFour


Lessee
Period End2020-09-30
Value170
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFour100.0

cytk:LiabilityRelatedToSaleOfFutureRoyaltiesNet

cytk:LiabilityRelatedToSaleOfFutureRoyaltiesNet


Liability
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-31
Value17116816616015414814313713212712211711310810410096920.0
Percentage of LiabilityRelatedToSaleOfFutureRoyaltiesNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0

cytk:LongTermDebtMaturitiesRepaymentsInterestAndFinalPayment us-gaap:DebtInstrument, us-gaap:LongtermDebtType

cytk:LongTermDebtMaturitiesRepaymentsInterestAndFinalPayment

cytk:OxfordAndSiliconValleyBank, cytk:TermLoanAgreement


Long
Period End2021-06-302021-03-312020-12-312020-09-30
Value10111212
Percentage of LongTermDebtMaturitiesRepaymentsInterestAndFinalPayment100.0100.0100.0100.0

cytk:LongTermLeaseAndOtherNonCurrentLiabilities

cytk:LongTermLeaseAndOtherNonCurrentLiabilities


Long
Period End2021-06-302020-12-312020-09-302019-12-31
Value990.442.5172.195
Percentage of LongTermLeaseAndOtherNonCurrentLiabilities100.0100.0100.0100.0

cytk:OperatingLeaseRightOfUseAssetsAndOtherAssets

cytk:OperatingLeaseRightOfUseAssetsAndOtherAssets


Operating
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312018-12-31
Value9282000.07075000.07930000.08972000.08882000.0300000.0
Percentage of OperatingLeaseRightOfUseAssetsAndOtherAssets100.0100.0100.0100.0100.0100.0

cytk:OperatingLeasesUndiscountedLeasePayments us-gaap:StatementGeographical, us-gaap:LeaseContractualTerm

cytk:OperatingLeasesUndiscountedLeasePayments

country:CA, cytk:OfficeAndLaboratory


Operating
Period End2020-12-31
Value217
Percentage of OperatingLeasesUndiscountedLeasePayments100.0

stpr:CA, cytk:OfficeAndLaboratory


Operating
Period End2021-06-302021-03-312020-09-30
Value230230217
Percentage of OperatingLeasesUndiscountedLeasePayments0.00.00.0

cytk:PercentOfRoyaltyOnSale cytk:Medical, us-gaap:ResearchAndDevelopmentArrangementContractToPerformForOthersByType

cytk:PercentOfRoyaltyOnSale

cytk:OmecamtivMecarbil, us-gaap:RoyaltyAgreementTerms


Percent
Period End2020-12-31
Value4.5
Percentage of PercentOfRoyaltyOnSale100.0

cytk:PotentialMilestonePaymentsAndRoyaltiesReceivable us-gaap:Range, us-gaap:TypeOfArrangement

cytk:PotentialMilestonePaymentsAndRoyaltiesReceivable

srt:Maximum, cytk:LicenseAndCollaborationAgreement


Potential
Period End2020-07-14
Value200
Percentage of PotentialMilestonePaymentsAndRoyaltiesReceivable100.0

cytk:PotentialMilestonePaymentsReceivable us-gaap:Range, us-gaap:SubsequentEventType, us-gaap:TypeOfArrangement

cytk:PotentialMilestonePaymentsReceivable

srt:Maximum, us-gaap:SubsequentEvent, cytk:FundingAgreement


Potential
Period End2020-07-14
Value90
Percentage of PotentialMilestonePaymentsReceivable100.0

srt:Maximum, us-gaap:SubsequentEvent, cytk:LicenseAndCollaborationAgreement


Potential
Period End2020-07-14
Value200
Percentage of PotentialMilestonePaymentsReceivable222.2

cytk:PotentialMilestonePaymentsReceivable us-gaap:Range, us-gaap:TypeOfArrangement

srt:Maximum, cytk:FundingAgreement


Potential
Period End2020-07-14
Value90
Percentage of PotentialMilestonePaymentsReceivable100.0

cytk:PotentialMilestonePaymentsReceivable us-gaap:StatementScenario, us-gaap:TypeOfArrangement

srt:ScenarioForecast, cytk:FundingAgreement


Potential
Period End2024-01-14
Value45
Percentage of PotentialMilestonePaymentsReceivable0.0

cytk:RevenueRecognitionPreCommercializationMilestoneReceivable dei:LegalEntity, us-gaap:AdjustmentsForNewAccountingPronouncements

cytk:RevenueRecognitionPreCommercializationMilestoneReceivable

cytk:Amgen, us-gaap:AccountingStandardsUpdate201409


Revenue
Period End2020-09-30
Value300
Percentage of RevenueRecognitionPreCommercializationMilestoneReceivable100.0

cytk:SaleOfInterestInFutureRoyalties us-gaap:TypeOfArrangement

cytk:SaleOfInterestInFutureRoyalties

cytk:RoyaltyPurchaseAgreement


Sale
Period End2020-12-31
Value85
Percentage of SaleOfInterestInFutureRoyalties100.0

cytk:UpfrontPaymentReceived us-gaap:TypeOfArrangement

cytk:UpfrontPaymentReceived

cytk:LicenseAndCollaborationAgreement


Upfront
Period End2020-07-14
Value25
Percentage of UpfrontPaymentReceived100.0

us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax us-gaap:CashAndCashEquivalents, us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax

cytk:AgencyBonds, cytk:CashAndCashEquivalentsAndInvestments, us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312018-12-31
Value11000.018000.015000.06000.020000.083000.023000.01000.0
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0

cytk:CorporateObligations, cytk:CashAndCashEquivalentsAndInvestments, us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312018-12-31
Value8000.02000.07000.038000.0136000.08000.024000.02000.0
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax72.711.146.7633.3680.09.6104.3200.0

us-gaap:CommercialPaper, cytk:CashAndCashEquivalentsAndInvestments, us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312018-12-31
Value10000.04000.03000.01000.005000.04000.00
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax90.922.220.016.70.06.017.40.0

us-gaap:USTreasurySecurities, cytk:CashAndCashEquivalentsAndInvestments, us-gaap:FairValueInputsLevel1, us-gaap:FairValueMeasurementsRecurring


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312018-12-31
Value31000.080000.0147000.0343000.0608000.01047000.072000.00
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax281.8444.4980.05716.73040.01261.4313.00.0

us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax us-gaap:FairValueByAssetClass, us-gaap:FairValueByMeasurementFrequency

cytk:CashAndCashEquivalentsAndInvestments, us-gaap:FairValueMeasurementsRecurring


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312018-12-31
Value60000.0104000.0172000.0388000.0764000.01143000.0123000.03000.0
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax545.5577.81146.76466.73820.01377.1534.8300.0

us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax us-gaap:CashAndCashEquivalents, us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax

cytk:AgencyBonds, cytk:CashAndCashEquivalentsAndInvestments, us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring


Available
Period End2021-06-302020-12-312020-09-302020-06-302020-03-312019-12-312018-12-31
Value3000.03000.02000.0009000.014000.0
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax100.0100.0100.00.00.0100.0100.0

cytk:CorporateObligations, cytk:CashAndCashEquivalentsAndInvestments, us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312018-12-31
Value72000.055000.011000.01000.00103000.07000.08000.0
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax2400.00.0366.750.00.00.077.857.1

us-gaap:CommercialPaper, cytk:CashAndCashEquivalentsAndInvestments, us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring


Available
Period End2021-06-302020-12-312020-06-302020-03-312019-12-312018-12-31
Value1000.01000.000013000.0
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax33.333.30.00.00.092.9

us-gaap:USTreasurySecurities, cytk:CashAndCashEquivalentsAndInvestments, us-gaap:FairValueInputsLevel1, us-gaap:FairValueMeasurementsRecurring


Available
Period End2021-06-302020-12-312020-06-302020-03-312019-12-312018-12-31
Value6000.08000.0001000.041000.0
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax200.0266.70.00.011.1292.9

us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax us-gaap:FairValueByAssetClass, us-gaap:FairValueByMeasurementFrequency

cytk:CashAndCashEquivalentsAndInvestments, us-gaap:FairValueMeasurementsRecurring


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312018-12-31
Value82000.055000.023000.03000.00103000.017000.076000.0
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax2733.30.0766.7150.00.00.0188.9542.9

us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis us-gaap:CashAndCashEquivalents, us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis

cytk:AgencyBonds, cytk:CashAndCashEquivalentsAndInvestments, us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312018-12-31
Value4348514313284761
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis100.0100.0100.0100.0100.0100.0100.0100.0

cytk:CorporateObligations, cytk:CashAndCashEquivalentsAndInvestments, us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312018-12-31
Value11779423532354017
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis267.4164.682.280.9234.4125.986.028.6

us-gaap:CommercialPaper, cytk:CashAndCashEquivalentsAndInvestments, us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312018-12-31
Value515049193.06.2271019
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis117.2104.296.043.921.721.922.231.5

us-gaap:MoneyMarketFunds, cytk:CashAndCashEquivalentsAndInvestments, us-gaap:FairValueInputsLevel1, us-gaap:FairValueMeasurementsRecurring


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312018-12-31
Value35338018961463134
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis80.669.2155.2435.5442.7163.967.156.3

us-gaap:USTreasurySecurities, cytk:CashAndCashEquivalentsAndInvestments, us-gaap:FairValueInputsLevel1, us-gaap:FairValueMeasurementsRecurring


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312018-12-31
Value17424027415910011513456
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis396.5496.5532.0366.7729.4406.4286.892.2

us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis us-gaap:FairValueByAssetClass, us-gaap:FairValueByMeasurementFrequency

cytk:CashAndCashEquivalentsAndInvestments, us-gaap:FairValueMeasurementsRecurring


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312018-12-31
Value422453497446210232264190
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis961.7934.5965.31026.91528.2818.2562.0308.5

us-gaap:AvailableForSaleSecuritiesDebtSecurities

us-gaap:AvailableForSaleSecuritiesDebtSecurities


Available
Period End2021-06-302021-03-312020-12-31
Value422453498
Percentage of AvailableForSaleSecuritiesDebtSecurities100.0100.0100.0

us-gaap:AvailableForSaleSecuritiesDebtSecurities us-gaap:BalanceSheetLocation

cytk:LongTermInvestment


Available
Period End2021-06-302021-03-312020-12-31
Value733436
Percentage of AvailableForSaleSecuritiesDebtSecurities17.47.67.4

us-gaap:AvailableForSaleSecuritiesDebtSecurities us-gaap:CashAndCashEquivalents, us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

cytk:AgencyBonds, cytk:CashAndCashEquivalentsAndInvestments, us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312018-12-31
Value4348514313284761
Percentage of AvailableForSaleSecuritiesDebtSecurities10.410.710.40.00.00.00.00.0

cytk:CorporateObligations, cytk:CashAndCashEquivalentsAndInvestments, us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312018-12-31
Value11779423532354017
Percentage of AvailableForSaleSecuritiesDebtSecurities27.817.68.50.00.00.00.00.0

us-gaap:CommercialPaper, cytk:CashAndCashEquivalentsAndInvestments, us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312018-12-31
Value515049193.06.2321019
Percentage of AvailableForSaleSecuritiesDebtSecurities12.211.29.90.00.00.00.00.0

us-gaap:MoneyMarketFunds, cytk:CashAndCashEquivalentsAndInvestments, us-gaap:FairValueInputsLevel1, us-gaap:FairValueMeasurementsRecurring


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312018-12-31
Value35338018961463134
Percentage of AvailableForSaleSecuritiesDebtSecurities8.47.416.10.00.00.00.00.0

us-gaap:USTreasurySecurities, cytk:CashAndCashEquivalentsAndInvestments, us-gaap:FairValueInputsLevel1, us-gaap:FairValueMeasurementsRecurring


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312018-12-31
Value17424027415910111613456
Percentage of AvailableForSaleSecuritiesDebtSecurities41.253.155.10.00.00.00.00.0

us-gaap:AvailableForSaleSecuritiesDebtSecurities us-gaap:FairValueByAssetClass, us-gaap:FairValueByMeasurementFrequency

cytk:CashAndCashEquivalentsAndInvestments, us-gaap:FairValueMeasurementsRecurring


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312018-12-31
Value422453498447211233264190
Percentage of AvailableForSaleSecuritiesDebtSecurities100.0100.0100.00.00.00.00.00.0

us-gaap:AvailableForSaleSecuritiesDebtSecurities us-gaap:InvestmentType

us-gaap:CashAndCashEquivalents


Available
Period End2021-06-302021-03-312020-12-31
Value353780
Percentage of AvailableForSaleSecuritiesDebtSecurities8.48.316.1

us-gaap:ShortTermInvestments


Available
Period End2021-06-302021-03-312020-12-312017-12-31
Value313380381143
Percentage of AvailableForSaleSecuritiesDebtSecurities74.284.176.50.0

us-gaap:AvailableForSaleSecuritiesDebtSecuritiesCurrent

us-gaap:AvailableForSaleSecuritiesDebtSecuritiesCurrent


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value313380381209151170188126138137156182184136143191211157894862614672808563656569576258485960262530384354
Percentage of AvailableForSaleSecuritiesDebtSecuritiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AvailableForSaleSecuritiesNoncurrent

us-gaap:AvailableForSaleSecuritiesNoncurrent


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-06-302018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-31
Value733436400.016422.2540.00.00.04.015160.58320507.6727.7377.6840.179
Percentage of AvailableForSaleSecuritiesNoncurrent100.0100.0100.0100.00.0100.0100.0100.00.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CashCashEquivalentsAndShortTermInvestments

us-gaap:CashCashEquivalentsAndShortTermInvestments


Cash
Period End2020-12-312019-12-312018-12-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-12-31
Value5012671982853083322571638698108111981081178382921018085756174819049
Percentage of CashCashEquivalentsAndShortTermInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-31
Value37448220061493639343942274611512511610066
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 us-gaap:ClassOfWarrantOrRight, us-gaap:RelatedPartyTransactionsByRelatedParty

us-gaap:ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1

cytk:Warrant1, cytk:OTALLC


Class
Period End2020-10-312020-07-31
Value9.7556.59
Percentage of ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1100.0100.0

cytk:Warrant2, cytk:OTALLC


Class
Period End2020-07-31
Value6.903
Percentage of ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1104.7

cytk:Warrant3, cytk:OTALLC


Class
Period End2020-07-31
Value7.1
Percentage of ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1107.7

us-gaap:ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 us-gaap:ClassOfWarrantOrRight, us-gaap:RelatedPartyTransactionsByRelatedParty, us-gaap:SubsequentEventType

cytk:Warrant1, cytk:OTALLC, us-gaap:SubsequentEvent


Class
Period End2020-10-312020-07-16
Value9.7556.59
Percentage of ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1100.00.0

cytk:Warrant2, cytk:OTALLC, us-gaap:SubsequentEvent


Class
Period End2020-07-16
Value6.903
Percentage of ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights10.0

cytk:Warrant3, cytk:OTALLC, us-gaap:SubsequentEvent


Class
Period End2020-07-16
Value7.1
Percentage of ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights10.0

us-gaap:CommonStockCapitalSharesReservedForFutureIssuance us-gaap:PlanName

us-gaap:CommonStockCapitalSharesReservedForFutureIssuance

cytk:TwoThousandFifteenEmployeeStockPurchasePlan


Common
Period End2020-09-30
Value0.5
Percentage of CommonStockCapitalSharesReservedForFutureIssuance100.0

us-gaap:ConvertibleDebtFairValueDisclosures

us-gaap:ConvertibleDebtFairValueDisclosures


Convertible
Period End2021-06-302021-03-312020-12-312020-09-302019-12-31
Value3103380.6387308170
Percentage of ConvertibleDebtFairValueDisclosures100.0100.0100.0100.0100.0

us-gaap:DebtInstrumentUnamortizedDiscount us-gaap:DebtInstrument

us-gaap:DebtInstrumentUnamortizedDiscount

cytk:ConvertibleSeniorNotesDue2026


Debt
Period End2021-06-302021-03-312020-12-312020-09-30
Value43444547
Percentage of DebtInstrumentUnamortizedDiscount100.0100.0100.0100.0

us-gaap:DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet us-gaap:DebtInstrument

us-gaap:DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet

cytk:ConvertibleSeniorNotesDue2026


Debt
Period End2021-06-302021-03-31
Value4547
Percentage of DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet100.0100.0

us-gaap:DeferredFinanceCostsNet us-gaap:TypeOfArrangement

us-gaap:DeferredFinanceCostsNet

cytk:FundingAgreement


Deferred
Period End2020-09-30
Value200000.0
Percentage of DeferredFinanceCostsNet100.0

us-gaap:DeferredIncomeTaxLiabilities

us-gaap:DeferredIncomeTaxLiabilities


Deferred
Period End2020-12-312019-12-312018-12-312017-12-31
Value11152.7020.0
Percentage of DeferredIncomeTaxLiabilities100.0100.0100.00.0

us-gaap:DeferredRevenueNoncurrent

us-gaap:DeferredRevenueNoncurrent


Deferred
Period End2021-06-302021-03-312020-12-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-03-312013-12-31
Value8787870.00.00.00.01515151515151.2750.8510.04.3468.29312160.0520.7721.5
Percentage of DeferredRevenueNoncurrent100.0100.0100.00.00.00.00.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsGross

us-gaap:DeferredTaxAssetsGross


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value286261223204216218204203190169150
Percentage of DeferredTaxAssetsGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsOperatingLossCarryforwards

us-gaap:DeferredTaxAssetsOperatingLossCarryforwards


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value16214312198146153148144153141121
Percentage of DeferredTaxAssetsOperatingLossCarryforwards100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsPropertyPlantAndEquipment

us-gaap:DeferredTaxAssetsPropertyPlantAndEquipment


Deferred
Period End2020-12-312019-12-312018-12-31
Value746000.0722000.0586000.0
Percentage of DeferredTaxAssetsPropertyPlantAndEquipment100.0100.0100.0

us-gaap:DeferredTaxAssetsTaxCreditCarryforwards

us-gaap:DeferredTaxAssetsTaxCreditCarryforwards


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value7167646446383433251616
Percentage of DeferredTaxAssetsTaxCreditCarryforwards100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value108.695.7721010126.2174.9465.1013.5243.632
Percentage of DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxLiabilitiesFinancingArrangements

us-gaap:DeferredTaxLiabilitiesFinancingArrangements


Deferred
Period End2020-12-312019-12-312018-12-31
Value9.832120.0
Percentage of DeferredTaxLiabilitiesFinancingArrangements100.0100.00.0

us-gaap:DeferredTaxLiabilitiesLeasingArrangements

us-gaap:DeferredTaxLiabilitiesLeasingArrangements


Deferred
Period End2020-12-312019-12-312018-12-31
Value651000.01484000.00
Percentage of DeferredTaxLiabilitiesLeasingArrangements100.0100.00.0

us-gaap:EmployeeRelatedLiabilitiesCurrent

us-gaap:EmployeeRelatedLiabilitiesCurrent


Employee
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-09-302015-12-31
Value8.7796.98711107.4765.2298.3436.6735.193.8996.1185.3724.5273.5656.261.9911.464
Percentage of EmployeeRelatedLiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions us-gaap:AwardType

us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions

us-gaap:EmployeeStockOption


Employee
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value221313118.57.75.73.2
Percentage of EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RestrictedStockUnitsRSU


Employee
Period End2020-12-312019-12-312018-12-312014-12-312013-12-312012-12-31
Value7.93.53.50.30.1491.1
Percentage of EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions35.625.925.45.34.70.0

us-gaap:InterestPayableCurrentAndNoncurrent us-gaap:DebtInstrument

us-gaap:InterestPayableCurrentAndNoncurrent

cytk:ConvertibleSeniorNotesDue2026


Interest
Period End2021-06-302021-03-31
Value3033
Percentage of InterestPayableCurrentAndNoncurrent100.0100.0

us-gaap:LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear

us-gaap:LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear


Lessee
Period End2020-09-30
Value1332000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear100.0

us-gaap:LongTermDebtFairValue

us-gaap:LongTermDebtFairValue


Long
Period End2021-06-302021-03-312020-12-312020-09-302019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-03-312015-12-312014-12-31
Value464646454544444242413232313030302929140.0
Percentage of LongTermDebtFairValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths us-gaap:DebtInstrument, us-gaap:LongtermDebtType

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths

cytk:OxfordAndSiliconValleyBank, cytk:TermLoanAgreement


Long
Period End2021-06-302021-03-312020-12-312020-09-30
Value25253.67312
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths100.0100.0100.0100.0

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree us-gaap:DebtInstrument, us-gaap:LongtermDebtType

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree

cytk:OxfordAndSiliconValleyBank, cytk:TermLoanAgreement


Long
Period End2020-12-312020-09-30
Value2823
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree100.0100.0

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo us-gaap:DebtInstrument, us-gaap:LongtermDebtType

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo

cytk:OxfordAndSiliconValleyBank, cytk:TermLoanAgreement


Long
Period End2021-06-302021-03-312020-12-312020-09-30
Value28282520
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo100.0100.0100.0100.0

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear us-gaap:DebtInstrument

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear

cytk:ConvertibleSeniorNotesDue2026


Long
Period End2021-06-302021-03-31
Value2760000.05520000.0
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear100.0100.0

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear us-gaap:DebtInstrument, us-gaap:LongtermDebtType

cytk:OxfordAndSiliconValleyBank, cytk:TermLoanAgreement


Long
Period End2021-06-302021-03-312020-09-30
Value1841000.02767000.0916000.0
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear66.750.10.0

us-gaap:OperatingLeaseWeightedAverageDiscountRatePercent

us-gaap:OperatingLeaseWeightedAverageDiscountRatePercent


Operating
Period End2020-12-312020-09-302020-06-302020-03-31
Value9.09.00.090.09
Percentage of OperatingLeaseWeightedAverageDiscountRatePercent100.0100.0100.0100.0

us-gaap:OperatingLeaseWeightedAverageDiscountRatePercent us-gaap:LeaseContractualTerm

cytk:OfficeSpaceLeaseCurrent


Operating
Period End2021-06-302021-03-31
Value6.89.0
Percentage of OperatingLeaseWeightedAverageDiscountRatePercent0.00.0

cytk:OfficeSpaceLeaseExpansion


Operating
Period End2021-03-312020-12-312020-09-302020-06-30
Value11.511.511.50.115
Percentage of OperatingLeaseWeightedAverageDiscountRatePercent0.0127.8127.8127.8

us-gaap:OperatingLossCarryforwards us-gaap:IncomeTaxAuthority

us-gaap:OperatingLossCarryforwards

us-gaap:DomesticCountry


Operating
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value662576490382388403386375400
Percentage of OperatingLossCarryforwards100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StateAndLocalJurisdiction


Operating
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value317299252244249275285286296
Percentage of OperatingLossCarryforwards47.851.951.663.964.468.273.976.274.2

us-gaap:PurchaseObligationFutureMinimumPaymentsRemainderOfFiscalYear

us-gaap:PurchaseObligationFutureMinimumPaymentsRemainderOfFiscalYear


Purchase
Period End2021-06-302021-03-31
Value4133000.02677000.0
Percentage of PurchaseObligationFutureMinimumPaymentsRemainderOfFiscalYear100.0100.0

us-gaap:SaleOfStockPricePerShare us-gaap:SubsequentEventType, us-gaap:SubsidiarySaleOfStock

us-gaap:SaleOfStockPricePerShare

us-gaap:SubsequentEvent, cytk:UnderwrittenPublicOffering


Sale
Period End2021-07-23
Value27.5
Percentage of SaleOfStockPricePerShare100.0

us-gaap:SaleOfStockPricePerShare us-gaap:SubsidiarySaleOfStock

cytk:UnderwrittenPublicOffering


Sale
Period End2020-07-31
Value24.0
Percentage of SaleOfStockPricePerShare0.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue

us-gaap:RestrictedStockUnitsRSU


Share
Period End2020-12-312019-12-312018-12-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-312013-12-312012-12-31
Value11.887.498.5310.4410.5810.4410.437.197.197.187.198.498.498.498.516.06.78
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant us-gaap:PlanName

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant

cytk:TwoThousandAndFourEquityIncentivePlan


Share
Period End2020-12-312020-09-30
Value2600000.02700000.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice


Share
Period End2020-12-31
Value8.91
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue


Share
Period End2020-12-312019-12-312018-12-31
Value91180.412
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue100.0100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue us-gaap:PlanName

cytk:TwoThousandAndFourEquityIncentivePlan


Share
Period End2020-12-31
Value91
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue100.0

us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1

us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1


Sharebased
Period End2020-12-31
Value67
Percentage of SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1100.0

us-gaap:SharesIssuedPricePerShare us-gaap:TypeOfArrangement

us-gaap:SharesIssuedPricePerShare

cytk:CommonStockPurchaseAgreement


Shares
Period End2020-07-14
Value25.0
Percentage of SharesIssuedPricePerShare100.0

us-gaap:UnamortizedDebtIssuanceExpense us-gaap:DebtInstrument

us-gaap:UnamortizedDebtIssuanceExpense

cytk:ConvertibleSeniorNotesDue2026


Unamortized
Period End2021-06-302020-12-312019-11-13
Value2600000.02800000.02900000.0
Percentage of UnamortizedDebtIssuanceExpense100.0100.0100.0

us-gaap:UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate

us-gaap:UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate


Unrecognized
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value9600000.09100000.08600000.08100000.06300000.05500000.05100000.05000000.04200000.04300000.0
Percentage of UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Line plots across dimensions of each concept


us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecurities
(None,)
Antidilutive Securities Excluded From Computation Of Earnings Per Share Amountus-gaap: Antidilutive Securities Excluded From Computation Of Earnings Per Share By Antidilutive Securities
TTM Greenblatt ROC
_
(None,)
T T M  Greenblatt  R O C_
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
us-gaap:ProductOrService
(None,)
Revenue From Contract With Customer Excluding Assessed Taxus-gaap: Product Or Service
us-gaap:StockholdersEquity
us-gaap:StatementEquityComponents
(None,)
Stockholders Equityus-gaap: Statement Equity Components
us-gaap:AccountsReceivableNetCurrent
us-gaap:MajorCustomers, us-gaap:ProductOrService
('cytk:Amgen', None)
Accounts Receivable Net Currentus-gaap: Major Customers, us-gaap: Product Or Service
us-gaap:PropertyPlantAndEquipmentGross
us-gaap:PropertyPlantAndEquipmentByType
(None,)
Property Plant And Equipment Grossus-gaap: Property Plant And Equipment By Type
us-gaap:StockholdersEquity
us-gaap:StatementEquityComponents
(None,)
Stockholders Equityus-gaap: Statement Equity Components