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Income Taxes (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Reconciliation of the total income tax provision tax rate [Abstract]      
Income tax expense (benefit) at federal statutory rate (in hundredths) (34.00%)us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate (34.00%)us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate (34.00%)us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Income tax expense (benefit) at state statutory rate (in hundredths) (3.52%)us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes (3.54%)us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes (2.79%)us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Gain on previously held equity interest in joint venture (in hundredths) 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationDispositionOfBusiness (7.02%)us-gaap_EffectiveIncomeTaxRateReconciliationDispositionOfBusiness 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationDispositionOfBusiness
Mark to market permanent adjustment (in hundredths) (0.37%)cytx_EffectiveIncomeTaxRateReconciliationMarkToMarketPermanentAdjustment (2.15%)cytx_EffectiveIncomeTaxRateReconciliationMarkToMarketPermanentAdjustment (0.24%)cytx_EffectiveIncomeTaxRateReconciliationMarkToMarketPermanentAdjustment
Change in federal valuation allowance (in hundredths) 27.12%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance 80.13%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance 35.86%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance
Change in state rate (in hundredths) 0.02%us-gaap_EffectiveIncomeTaxRateReconciliationTaxSettlementsStateAndLocal (1.01%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxSettlementsStateAndLocal (8.36%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxSettlementsStateAndLocal
Permanent interest adjustments (in hundredths) 4.17%cytx_PermanentInterestAdjustments 0.00%cytx_PermanentInterestAdjustments 0.00%cytx_PermanentInterestAdjustments
Debt refinance permanent adjustment (in hundredths) 3.92%cytx_DebtRefinancePermanentAdjustment 0.00%cytx_DebtRefinancePermanentAdjustment 0.00%cytx_DebtRefinancePermanentAdjustment
Acquired NOL's/Intangibles from joint venture (in hundredths) 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationDispositionOfAssets (33.40%)us-gaap_EffectiveIncomeTaxRateReconciliationDispositionOfAssets 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationDispositionOfAssets
Foreign rate differential (in hundredths) 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential 2.48%us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential (0.04%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential
Other, net (in hundredths) 2.66%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments (1.49%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments 9.57%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Total income tax provision (in hundredths) 0.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations 0.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations 0.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations
Deferred tax assets [Abstract]      
Allowances and reserves $ 825,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals $ 639,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals  
Accrued expenses 502,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities 718,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities  
Deferred revenue and gain-on-sale 32,000us-gaap_DeferredTaxAssetsDeferredIncome 79,000us-gaap_DeferredTaxAssetsDeferredIncome  
Stock based compensation 7,786,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost 6,962,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost  
Net operating loss carryforwards 117,258,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 107,846,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards  
Income tax credit carryforwards 6,993,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwards 6,710,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwards  
Property and equipment, principally due to differences in depreciation 926,000us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment 804,000us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment  
Other,net 77,000us-gaap_DeferredTaxAssetsOther 296,000us-gaap_DeferredTaxAssetsOther  
Deferred tax assets (Total) 134,399,000us-gaap_DeferredTaxAssetsGross 124,054,000us-gaap_DeferredTaxAssetsGross  
Valuation allowance (132,583,000)us-gaap_DeferredTaxAssetsValuationAllowance (122,450,000)us-gaap_DeferredTaxAssetsValuationAllowance  
Total deferred tax assets, net of allowance 1,816,000us-gaap_DeferredTaxAssetsNet 1,604,000us-gaap_DeferredTaxAssetsNet  
Deferred tax liabilities [Abstract]      
Intangibles (1,816,000)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets (1,604,000)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets  
Total deferred tax liability (1,816,000)us-gaap_DeferredIncomeTaxLiabilities (1,604,000)us-gaap_DeferredIncomeTaxLiabilities  
Net deferred tax assets (liability) 0us-gaap_DeferredTaxLiabilities 0us-gaap_DeferredTaxLiabilities  
Schedule of reconciliation of unrecognized tax benefits activity [Roll Forward]      
Unrecognized Tax Benefits - Beginning 1,723,000us-gaap_UnrecognizedTaxBenefits 1,394,000us-gaap_UnrecognizedTaxBenefits 1,304,000us-gaap_UnrecognizedTaxBenefits
Gross increases - tax positions in prior period 0us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions 69,000us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions 0us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions
Gross decreases - tax positions in prior period 0us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions 0us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions 0us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions
Gross increase - current-period tax positions 129,000us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions 260,000us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions 90,000us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions
Settlements 0us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromSettlementsWithTaxingAuthorities 0us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromSettlementsWithTaxingAuthorities 0us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromSettlementsWithTaxingAuthorities
Lapse of statute of limitations 0us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations 0us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations 0us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations
Unrecognized Tax Benefits - Ending 1,852,000us-gaap_UnrecognizedTaxBenefits 1,723,000us-gaap_UnrecognizedTaxBenefits 1,394,000us-gaap_UnrecognizedTaxBenefits
Income Tax Contingency [Line Items]      
Increased valuation allowance 10,133,000us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount    
Net operating loss carryforwards, Expire date Begin to expire in 2019 and 2015    
State tax credit carryforwards 4,113,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal    
Cumulative change in ownership (in hundredths) 50.00%cytx_CumulativeChangeInOwnership    
Period of net operating loss and R&D tax credit carry forwards to offset future taxable income 3 years    
Excess tax benefits 1,261,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits    
Period for material changes of liability for uncertain tax benefits 12 months    
Federal [Member]      
Income Tax Contingency [Line Items]      
Tax loss carryforwards 314,349,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember		    
Federal tax carry forward 4,279,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember		    
Federal tax credit carryforward, Expiration date Begin to expire in 2018    
California [Member]      
Income Tax Contingency [Line Items]      
Tax loss carryforwards 187,182,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= cytx_CaliforniaMember		    
Stock Option [Member]      
Income Tax Contingency [Line Items]      
Increased valuation allowance $ 579,000us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
/ us-gaap_FinancialInstrumentAxis
= us-gaap_StockOptionMember